AyeCode / invoicing

includes/api/class-wpinv-rest-invoice-controller.php

Indentation +1272 added lines, -1272 removed lines

@@ -20,31 +20,31 @@ 
 class WPInv_REST_Invoice_Controller extends WP_REST_Posts_Controller {
 
     /**
-	 * Post type.
-	 *
-	 * @var string
-	 */
-	protected $post_type = 'wpi_invoice';
+     * Post type.
+     *
+     * @var string
+     */
+    protected $post_type = 'wpi_invoice';
 	
-	/**
-	 * Cached results of get_item_schema.
-	 *
-	 * @since 1.0.13
-	 * @var array
-	 */
-	protected $schema;
+    /**
+     * Cached results of get_item_schema.
+     *
+     * @since 1.0.13
+     * @var array
+     */
+    protected $schema;
 
     /**
-	 * Constructor.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param string $namespace Api Namespace
-	 */
-	public function __construct( $namespace ) {
+     * Constructor.
+     *
+     * @since 1.0.13
+     *
+     * @param string $namespace Api Namespace
+     */
+    public function __construct( $namespace ) {
         
         // Set api namespace...
-		$this->namespace = $namespace;
+        $this->namespace = $namespace;
 
         // ... and the rest base
         $this->rest_base = 'invoices';
@@ -52,79 +52,79 @@ 
     }
     
     /**
-	 * Checks if a given request has access to read invoices.
+     * Checks if a given request has access to read invoices.
      * 
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WP_REST_Request $request Full details about the request.
-	 * @return true|WP_Error True if the request has read access, WP_Error object otherwise.
-	 */
-	public function get_items_permissions_check( $request ) {
+     *
+     * @since 1.0.13
+     *
+     * @param WP_REST_Request $request Full details about the request.
+     * @return true|WP_Error True if the request has read access, WP_Error object otherwise.
+     */
+    public function get_items_permissions_check( $request ) {
 	
         $post_type = get_post_type_object( $this->post_type );
 
-		if ( 'edit' === $request['context'] && ! current_user_can( $post_type->cap->edit_posts ) ) {
-			return new WP_Error( 'rest_forbidden_context', __( 'Sorry, you are not allowed to edit items.', 'invoicing' ), array( 'status' => rest_authorization_required_code() ) );
-		}
+        if ( 'edit' === $request['context'] && ! current_user_can( $post_type->cap->edit_posts ) ) {
+            return new WP_Error( 'rest_forbidden_context', __( 'Sorry, you are not allowed to edit items.', 'invoicing' ), array( 'status' => rest_authorization_required_code() ) );
+        }
 
-		if ( ! is_user_logged_in() ) {
-			return new WP_Error( 'rest_forbidden', __( 'Sorry, you must be logged in to view items.', 'invoicing' ), array( 'status' => rest_authorization_required_code() ) );
-		}
+        if ( ! is_user_logged_in() ) {
+            return new WP_Error( 'rest_forbidden', __( 'Sorry, you must be logged in to view items.', 'invoicing' ), array( 'status' => rest_authorization_required_code() ) );
+        }
 
-		// Read checks will be evaluated on a per invoice basis
+        // Read checks will be evaluated on a per invoice basis
 
-		return true;
+        return true;
 
     }
     
     /**
-	 * Retrieves a collection of invoices.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WP_REST_Request $request Full details about the request.
-	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
-	 */
-	public function get_items( $request ) {
+     * Retrieves a collection of invoices.
+     *
+     * @since 1.0.13
+     *
+     * @param WP_REST_Request $request Full details about the request.
+     * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
+     */
+    public function get_items( $request ) {
 		
-		// Retrieve request query parameters.
-		$args          = $this->get_request_collection_params( $request );
+        // Retrieve request query parameters.
+        $args          = $this->get_request_collection_params( $request );
 		
-		// WP_Query Args.
-		$wp_query_args = $this->get_collection_wp_query_params( $args, $request );
+        // WP_Query Args.
+        $wp_query_args = $this->get_collection_wp_query_params( $args, $request );
 		
-		// Get invoice ids...
-		$query         = new WP_Query( $wp_query_args );
-
-		// ... and map them into invoice objects.
-		$_invoices     = array_map( array( $this, 'get_post' ), $query->posts );
-
-		// Prepare the retrieved invoices
-		$invoices      = array();
-
-		foreach( $_invoices as $invoice ) {
-			if ( $this->check_read_permission( $invoice ) ) {
-				$invoices[] = $this->prepare_response_for_collection( $this->prepare_item_for_response( $invoice, $request ) );
-			}
-		}
-
-		// Prepare the response.
-		$response = rest_ensure_response( $invoices );
-		$response->header( 'X-WP-Total', (int) $query->found_posts );
-		$response->header( 'X-WP-TotalPages', (int) $query->max_num_pages );
-
-		/**
-		 * Filters the responses for invoices requests.
-		 *
-		 *
-		 * @since 1.0.13
-		 *
-		 *
-		 * @param arrWP_REST_Response $response    Response object.
-		 * @param WP_REST_Request     $request The request used.
+        // Get invoice ids...
+        $query         = new WP_Query( $wp_query_args );
+
+        // ... and map them into invoice objects.
+        $_invoices     = array_map( array( $this, 'get_post' ), $query->posts );
+
+        // Prepare the retrieved invoices
+        $invoices      = array();
+
+        foreach( $_invoices as $invoice ) {
+            if ( $this->check_read_permission( $invoice ) ) {
+                $invoices[] = $this->prepare_response_for_collection( $this->prepare_item_for_response( $invoice, $request ) );
+            }
+        }
+
+        // Prepare the response.
+        $response = rest_ensure_response( $invoices );
+        $response->header( 'X-WP-Total', (int) $query->found_posts );
+        $response->header( 'X-WP-TotalPages', (int) $query->max_num_pages );
+
+        /**
+         * Filters the responses for invoices requests.
+         *
+         *
+         * @since 1.0.13
+         *
+         *
+         * @param arrWP_REST_Response $response    Response object.
+         * @param WP_REST_Request     $request The request used.
          * @param array               $args Array of args used to retrieve the invoices
-		 */
+         */
         $response       = apply_filters( "wpinv_rest_invoices_response", $response, $request, $args );
 
         return rest_ensure_response( $response );
@@ -132,25 +132,25 @@ 
     }
 
     /**
-	 * Get the post, if the ID is valid.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param int $invoice_id Supplied ID.
-	 * @return WPInv_Invoice|WP_Error Invoice object if ID is valid, WP_Error otherwise.
-	 */
-	protected function get_post( $invoice_id ) {
+     * Get the post, if the ID is valid.
+     *
+     * @since 1.0.13
+     *
+     * @param int $invoice_id Supplied ID.
+     * @return WPInv_Invoice|WP_Error Invoice object if ID is valid, WP_Error otherwise.
+     */
+    protected function get_post( $invoice_id ) {
 		
-		$error     = new WP_Error( 'rest_invoice_invalid_id', __( 'Invalid item ID.', 'invoicing' ), array( 'status' => 404 ) );
+        $error     = new WP_Error( 'rest_invoice_invalid_id', __( 'Invalid item ID.', 'invoicing' ), array( 'status' => 404 ) );
 
         // Ids start from 1
         if ( (int) $invoice_id <= 0 ) {
-			return $error;
-		}
+            return $error;
+        }
 
-		$invoice = wpinv_get_invoice( (int) $invoice_id );
-		if ( empty( $invoice ) || $this->post_type !== $invoice->post_type ) {
-			return $error;
+        $invoice = wpinv_get_invoice( (int) $invoice_id );
+        if ( empty( $invoice ) || $this->post_type !== $invoice->post_type ) {
+            return $error;
         }
 
         return $invoice;
@@ -158,77 +158,77 @@ 
     }
 
     /**
-	 * Checks if a given request has access to read an invoice.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WP_REST_Request $request Full details about the request.
-	 * @return bool|WP_Error True if the request has read access for the invoice, WP_Error object otherwise.
-	 */
-	public function get_item_permissions_check( $request ) {
+     * Checks if a given request has access to read an invoice.
+     *
+     * @since 1.0.13
+     *
+     * @param WP_REST_Request $request Full details about the request.
+     * @return bool|WP_Error True if the request has read access for the invoice, WP_Error object otherwise.
+     */
+    public function get_item_permissions_check( $request ) {
 
         // Retrieve the invoice object.
         $invoice = $this->get_post( $request['id'] );
         
         // Ensure it is valid.
-		if ( is_wp_error( $invoice ) ) {
-			return $invoice;
-		}
+        if ( is_wp_error( $invoice ) ) {
+            return $invoice;
+        }
 
-		if ( $invoice ) {
-			return $this->check_read_permission( $invoice );
-		}
+        if ( $invoice ) {
+            return $this->check_read_permission( $invoice );
+        }
 
-		return true;
+        return true;
     }
     
     /**
-	 * Checks if an invoice can be read.
-	 * 
-	 * An invoice can be read by site admins and owners of the invoice
-	 *
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WPInv_Invoice $invoice WPInv_Invoice object.
-	 * @return bool Whether the post can be read.
-	 */
-	public function check_read_permission( $invoice ) {
-		return wpinv_user_can_view_invoice( $invoice->ID );
+     * Checks if an invoice can be read.
+     * 
+     * An invoice can be read by site admins and owners of the invoice
+     *
+     *
+     * @since 1.0.13
+     *
+     * @param WPInv_Invoice $invoice WPInv_Invoice object.
+     * @return bool Whether the post can be read.
+     */
+    public function check_read_permission( $invoice ) {
+        return wpinv_user_can_view_invoice( $invoice->ID );
     }
     
     /**
-	 * Retrieves a single invoice.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WP_REST_Request $request Full details about the request.
-	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
-	 */
-	public function get_item( $request ) {
+     * Retrieves a single invoice.
+     *
+     * @since 1.0.13
+     *
+     * @param WP_REST_Request $request Full details about the request.
+     * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
+     */
+    public function get_item( $request ) {
 
         // Fetch the invoice.
         $invoice = $this->get_post( $request['id'] );
         
         // Abort early if it does not exist
-		if ( is_wp_error( $invoice ) ) {
-			return $invoice;
-		}
-
-		// Prepare the response
-		$response = $this->prepare_item_for_response( $invoice, $request );
-		$response->link_header( 'alternate', esc_url( $invoice->get_view_url() ), array( 'type' => 'text/html' ) );
-
-		/**
-		 * Filters the responses for single invoice requests.
-		 *
-		 *
-		 * @since 1.0.13
-		 * @var WP_HTTP_Response
-		 *
-		 * @param WP_HTTP_Response $response Response.
-		 * @param WP_REST_Request  $request The request used.
-		 */
+        if ( is_wp_error( $invoice ) ) {
+            return $invoice;
+        }
+
+        // Prepare the response
+        $response = $this->prepare_item_for_response( $invoice, $request );
+        $response->link_header( 'alternate', esc_url( $invoice->get_view_url() ), array( 'type' => 'text/html' ) );
+
+        /**
+         * Filters the responses for single invoice requests.
+         *
+         *
+         * @since 1.0.13
+         * @var WP_HTTP_Response
+         *
+         * @param WP_HTTP_Response $response Response.
+         * @param WP_REST_Request  $request The request used.
+         */
         $response       = apply_filters( "wpinv_rest_get_invoice_response", $response, $request );
 
         return rest_ensure_response( $response );
@@ -236,23 +236,23 @@ 
     }
     
     /**
-	 * Checks if a given request has access to create an invoice.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WP_REST_Request $request Full details about the request.
-	 * @return true|WP_Error True if the request has access to create items, WP_Error object otherwise.
-	 */
-	public function create_item_permissions_check( $request ) {
+     * Checks if a given request has access to create an invoice.
+     *
+     * @since 1.0.13
+     *
+     * @param WP_REST_Request $request Full details about the request.
+     * @return true|WP_Error True if the request has access to create items, WP_Error object otherwise.
+     */
+    public function create_item_permissions_check( $request ) {
 	
-		if ( ! empty( $request['id'] ) ) {
-			return new WP_Error( 'rest_invoice_exists', __( 'Cannot create existing item.', 'invoicing' ), array( 'status' => 400 ) );
-		}
+        if ( ! empty( $request['id'] ) ) {
+            return new WP_Error( 'rest_invoice_exists', __( 'Cannot create existing item.', 'invoicing' ), array( 'status' => 400 ) );
+        }
 
-		$post_type = get_post_type_object( $this->post_type );
+        $post_type = get_post_type_object( $this->post_type );
 
-		if ( ! current_user_can( $post_type->cap->create_posts ) && ! wpinv_current_user_can_manage_invoicing() ) {
-			return new WP_Error( 
+        if ( ! current_user_can( $post_type->cap->create_posts ) && ! wpinv_current_user_can_manage_invoicing() ) {
+            return new WP_Error( 
                 'rest_cannot_create',
                 __( 'Sorry, you are not allowed to create items as this user.', 'invoicing' ), 
                 array( 
@@ -261,90 +261,90 @@ 
             );
         }
 
-		return true;
+        return true;
     }
     
     /**
-	 * Creates a single invoice.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WP_REST_Request $request Full details about the request.
-	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
-	 */
-	public function create_item( $request ) {
-
-		if ( ! empty( $request['id'] ) ) {
-			return new WP_Error( 'rest_invoice_exists', __( 'Cannot create existing item.', 'invoicing' ), array( 'status' => 400 ) );
-		}
-
-		$request->set_param( 'context', 'edit' );
-
-		// Prepare the updated data.
-		$invoice_data = $this->prepare_item_for_database( $request );
-
-		if ( is_wp_error( $invoice_data ) ) {
-			return $invoice_data;
-		}
-
-		// Try creating the invoice
-		$invoice_data['post_type']    = $this->post_type;
-		$invoice_data['private_note'] = __( 'Created via API.', 'invoicing' );
+     * Creates a single invoice.
+     *
+     * @since 1.0.13
+     *
+     * @param WP_REST_Request $request Full details about the request.
+     * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
+     */
+    public function create_item( $request ) {
+
+        if ( ! empty( $request['id'] ) ) {
+            return new WP_Error( 'rest_invoice_exists', __( 'Cannot create existing item.', 'invoicing' ), array( 'status' => 400 ) );
+        }
+
+        $request->set_param( 'context', 'edit' );
+
+        // Prepare the updated data.
+        $invoice_data = $this->prepare_item_for_database( $request );
+
+        if ( is_wp_error( $invoice_data ) ) {
+            return $invoice_data;
+        }
+
+        // Try creating the invoice
+        $invoice_data['post_type']    = $this->post_type;
+        $invoice_data['private_note'] = __( 'Created via API.', 'invoicing' );
         $invoice = wpinv_insert_invoice( $invoice_data, true );
 
-		if ( is_wp_error( $invoice ) ) {
+        if ( is_wp_error( $invoice ) ) {
             return $invoice;
-		}
-
-		// Prepare the response
-		$response = $this->prepare_item_for_response( $invoice, $request );
-
-		/**
-		 * Fires after a single invoice is created or updated via the REST API.
-		 *
-		 * @since 1.0.13
-		 *
-		 * @param WPinv_Invoice   $invoice  Inserted or updated invoice object.
-		 * @param WP_REST_Request $request  Request object.
-		 * @param bool            $creating True when creating a post, false when updating.
-		 */
-		do_action( "wpinv_rest_insert_invoice", $invoice, $request, true );
-
-		/**
-		 * Filters the responses for creating single invoice requests.
-		 *
-		 *
-		 * @since 1.0.13
-		 *
-		 *
-		 * @param array           $invoice_data Invoice properties.
-		 * @param WP_REST_Request $request The request used.
-		 */
+        }
+
+        // Prepare the response
+        $response = $this->prepare_item_for_response( $invoice, $request );
+
+        /**
+         * Fires after a single invoice is created or updated via the REST API.
+         *
+         * @since 1.0.13
+         *
+         * @param WPinv_Invoice   $invoice  Inserted or updated invoice object.
+         * @param WP_REST_Request $request  Request object.
+         * @param bool            $creating True when creating a post, false when updating.
+         */
+        do_action( "wpinv_rest_insert_invoice", $invoice, $request, true );
+
+        /**
+         * Filters the responses for creating single invoice requests.
+         *
+         *
+         * @since 1.0.13
+         *
+         *
+         * @param array           $invoice_data Invoice properties.
+         * @param WP_REST_Request $request The request used.
+         */
         $response       = apply_filters( "wpinv_rest_create_invoice_response", $response, $request );
 
         return rest_ensure_response( $response );
-	}
-
-	/**
-	 * Checks if a given request has access to update an invoice.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WP_REST_Request $request Full details about the request.
-	 * @return true|WP_Error True if the request has access to update the item, WP_Error object otherwise.
-	 */
-	public function update_item_permissions_check( $request ) {
-
-		// Retrieve the invoice.
-		$invoice = $this->get_post( $request['id'] );
-		if ( is_wp_error( $invoice ) ) {
-			return $invoice;
-		}
-
-		$post_type = get_post_type_object( $this->post_type );
-
-		if ( ! current_user_can(  $post_type->cap->edit_post, $invoice->ID  ) ) {
-			return new WP_Error( 
+    }
+
+    /**
+     * Checks if a given request has access to update an invoice.
+     *
+     * @since 1.0.13
+     *
+     * @param WP_REST_Request $request Full details about the request.
+     * @return true|WP_Error True if the request has access to update the item, WP_Error object otherwise.
+     */
+    public function update_item_permissions_check( $request ) {
+
+        // Retrieve the invoice.
+        $invoice = $this->get_post( $request['id'] );
+        if ( is_wp_error( $invoice ) ) {
+            return $invoice;
+        }
+
+        $post_type = get_post_type_object( $this->post_type );
+
+        if ( ! current_user_can(  $post_type->cap->edit_post, $invoice->ID  ) ) {
+            return new WP_Error( 
                 'rest_cannot_edit', 
                 __( 'Sorry, you are not allowed to update this item.', 'invoicing' ), 
                 array( 
@@ -353,162 +353,162 @@ 
             );
         }
 
-		return true;
-	}
-
-	/**
-	 * Updates a single invoice.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WP_REST_Request $request Full details about the request.
-	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
-	 */
-	public function update_item( $request ) {
+        return true;
+    }
+
+    /**
+     * Updates a single invoice.
+     *
+     * @since 1.0.13
+     *
+     * @param WP_REST_Request $request Full details about the request.
+     * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
+     */
+    public function update_item( $request ) {
 		
-		// Ensure the invoice exists.
+        // Ensure the invoice exists.
         $valid_check = $this->get_post( $request['id'] );
         
         // Abort early if it does not exist
-		if ( is_wp_error( $valid_check ) ) {
-			return $valid_check;
-		}
+        if ( is_wp_error( $valid_check ) ) {
+            return $valid_check;
+        }
 
-		$request->set_param( 'context', 'edit' );
+        $request->set_param( 'context', 'edit' );
 
-		// Prepare the updated data.
-		$data_to_update = $this->prepare_item_for_database( $request );
+        // Prepare the updated data.
+        $data_to_update = $this->prepare_item_for_database( $request );
 
-		if ( is_wp_error( $data_to_update ) ) {
-			return $data_to_update;
-		}
+        if ( is_wp_error( $data_to_update ) ) {
+            return $data_to_update;
+        }
 
-		// Abort if no invoice data is provided
+        // Abort if no invoice data is provided
         if( empty( $data_to_update ) ) {
             return new WP_Error( 'missing_data', __( 'An update request cannot be empty.', 'invoicing' ) );
         }
 
-		// Include the invoice ID
-		$data_to_update['ID'] = $request['id'];
-
-		// Update the invoice
-		$updated_invoice = wpinv_update_invoice( $data_to_update, true );
-
-		// Incase the update operation failed...
-		if ( is_wp_error( $updated_invoice ) ) {
-			return $updated_invoice;
-		}
-
-		// Prepare the response
-		$response = $this->prepare_item_for_response( $updated_invoice, $request );
-
-		/** This action is documented in includes/class-wpinv-rest-invoice-controller.php */
-		do_action( "wpinv_rest_insert_invoice", $updated_invoice, $request, false );
-
-		/**
-		 * Filters the responses for updating single invoice requests.
-		 *
-		 *
-		 * @since 1.0.13
-		 *
-		 *
-		 * @param array           $invoice_data Invoice properties.
-		 * @param WP_REST_Request $request The request used.
-		 */
+        // Include the invoice ID
+        $data_to_update['ID'] = $request['id'];
+
+        // Update the invoice
+        $updated_invoice = wpinv_update_invoice( $data_to_update, true );
+
+        // Incase the update operation failed...
+        if ( is_wp_error( $updated_invoice ) ) {
+            return $updated_invoice;
+        }
+
+        // Prepare the response
+        $response = $this->prepare_item_for_response( $updated_invoice, $request );
+
+        /** This action is documented in includes/class-wpinv-rest-invoice-controller.php */
+        do_action( "wpinv_rest_insert_invoice", $updated_invoice, $request, false );
+
+        /**
+         * Filters the responses for updating single invoice requests.
+         *
+         *
+         * @since 1.0.13
+         *
+         *
+         * @param array           $invoice_data Invoice properties.
+         * @param WP_REST_Request $request The request used.
+         */
         $response       = apply_filters( "wpinv_rest_update_invoice_response", $response, $request );
 
         return rest_ensure_response( $response );
-	}
-
-	/**
-	 * Checks if a given request has access to delete an invoice.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WP_REST_Request $request Full details about the request.
-	 * @return true|WP_Error True if the request has access to delete the invoice, WP_Error object otherwise.
-	 */
-	public function delete_item_permissions_check( $request ) {
-
-		// Retrieve the invoice.
-		$invoice = $this->get_post( $request['id'] );
-		if ( is_wp_error( $invoice ) ) {
-			return $invoice;
-		}
-
-		// Ensure the current user can delete invoices
-		if ( wpinv_current_user_can_manage_invoicing() ||  current_user_can( 'delete_invoices', $request['id'] ) ) {
-			return true;
-		}
-
-		return new WP_Error( 
-			'rest_cannot_delete', 
-			__( 'Sorry, you are not allowed to delete this item.', 'invoicing' ), 
-			array( 
-				'status' => rest_authorization_required_code(),
-			)
-		);
-	}
-
-	/**
-	 * Deletes a single invoice.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WP_REST_Request $request Full details about the request.
-	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
-	 */
-	public function delete_item( $request ) {
+    }
+
+    /**
+     * Checks if a given request has access to delete an invoice.
+     *
+     * @since 1.0.13
+     *
+     * @param WP_REST_Request $request Full details about the request.
+     * @return true|WP_Error True if the request has access to delete the invoice, WP_Error object otherwise.
+     */
+    public function delete_item_permissions_check( $request ) {
+
+        // Retrieve the invoice.
+        $invoice = $this->get_post( $request['id'] );
+        if ( is_wp_error( $invoice ) ) {
+            return $invoice;
+        }
+
+        // Ensure the current user can delete invoices
+        if ( wpinv_current_user_can_manage_invoicing() ||  current_user_can( 'delete_invoices', $request['id'] ) ) {
+            return true;
+        }
+
+        return new WP_Error( 
+            'rest_cannot_delete', 
+            __( 'Sorry, you are not allowed to delete this item.', 'invoicing' ), 
+            array( 
+                'status' => rest_authorization_required_code(),
+            )
+        );
+    }
+
+    /**
+     * Deletes a single invoice.
+     *
+     * @since 1.0.13
+     *
+     * @param WP_REST_Request $request Full details about the request.
+     * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
+     */
+    public function delete_item( $request ) {
 		
-		// Retrieve the invoice.
-		$invoice = $this->get_post( $request['id'] );
-		if ( is_wp_error( $invoice ) ) {
-			return $invoice;
-		}
+        // Retrieve the invoice.
+        $invoice = $this->get_post( $request['id'] );
+        if ( is_wp_error( $invoice ) ) {
+            return $invoice;
+        }
 
-		$request->set_param( 'context', 'edit' );
+        $request->set_param( 'context', 'edit' );
 
-		// Prepare the invoice id
-		$id    = $invoice->ID;
+        // Prepare the invoice id
+        $id    = $invoice->ID;
 
-		// Prepare the response
-		$response = $this->prepare_item_for_response( $invoice, $request );
+        // Prepare the response
+        $response = $this->prepare_item_for_response( $invoice, $request );
 
-		// Check if the user wants to bypass the trash...
-		$force_delete = (bool) $request['force'];
+        // Check if the user wants to bypass the trash...
+        $force_delete = (bool) $request['force'];
 
-		// Try deleting the invoice.
-		$deleted = wp_delete_post( $id, $force_delete );
+        // Try deleting the invoice.
+        $deleted = wp_delete_post( $id, $force_delete );
 
-		// Abort early if we can't delete the invoice.
-		if ( ! $deleted ) {
-			return new WP_Error( 'rest_cannot_delete', __( 'The item cannot be deleted.', 'invoicing' ), array( 'status' => 500 ) );
-		}
+        // Abort early if we can't delete the invoice.
+        if ( ! $deleted ) {
+            return new WP_Error( 'rest_cannot_delete', __( 'The item cannot be deleted.', 'invoicing' ), array( 'status' => 500 ) );
+        }
 
-		/**
-		 * Fires immediately after a single invoice is deleted or trashed via the REST API.
-		 *
-		 *
-		 * @since 1.0.13
-		 *
-		 * @param WPInv_Invoice    $invoice  The deleted or trashed invoice.
-		 * @param WP_REST_Request  $request  The request sent to the API.
-		 */
-		do_action( "wpinv_rest_delete_invoice", $invoice, $request );
+        /**
+         * Fires immediately after a single invoice is deleted or trashed via the REST API.
+         *
+         *
+         * @since 1.0.13
+         *
+         * @param WPInv_Invoice    $invoice  The deleted or trashed invoice.
+         * @param WP_REST_Request  $request  The request sent to the API.
+         */
+        do_action( "wpinv_rest_delete_invoice", $invoice, $request );
 
-		return $response;
+        return $response;
 
-	}
+    }
     
     
     /**
-	 * Retrieves the query params for the invoices collection.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @return array Collection parameters.
-	 */
-	public function get_collection_params() {
+     * Retrieves the query params for the invoices collection.
+     *
+     * @since 1.0.13
+     *
+     * @return array Collection parameters.
+     */
+    public function get_collection_params() {
         
         $query_params               = array(
 
@@ -526,11 +526,11 @@ 
 
             // User.
             'user'                  => array(
-				'description'       => __( 'Limit result set to items for a specif user. Accepts a user ID, or comma-separated list of IDs', 'invoicing' ),
-				'type'              => 'string',
-			),
+                'description'       => __( 'Limit result set to items for a specif user. Accepts a user ID, or comma-separated list of IDs', 'invoicing' ),
+                'type'              => 'string',
+            ),
 
-			// Exclude certain users
+            // Exclude certain users
             'exclude_users'  	    => array(
                 'description' 		=> __( 'Exclude items from specific users.', 'invoicing' ),
                 'type'        		=> 'array',
@@ -540,59 +540,59 @@ 
                 'default'     		=> array(),
             ),
 			
-			// Items before.
+            // Items before.
             'before_date'           => array(
-				'description'       => __( 'Limit result set to items created before a specific date. Accepts strtotime()-compatible string.', 'invoicing' ),
-				'type'              => 'string',
-			),
+                'description'       => __( 'Limit result set to items created before a specific date. Accepts strtotime()-compatible string.', 'invoicing' ),
+                'type'              => 'string',
+            ),
 
             'meta_key'           => array(
-				'description'       => __( 'Filter items by custom field key.', 'invoicing' ),
-				'type'              => 'string',
-			),
+                'description'       => __( 'Filter items by custom field key.', 'invoicing' ),
+                'type'              => 'string',
+            ),
 
             'meta_compare_key'           => array(
-				'description'       => __( 'Comparison operator to test the `meta_key`.', 'invoicing' ),
-				'type'              => 'string',
-				'default'              => '=',
-				'enum'        		=> array_map( 'trim', explode( ',', '=, !=, >, >=, <, <=, LIKE NOT, LIKE, IN, NOT IN, BETWEEN, NOT BETWEEN, NOT EXISTS, REGEXP, NOT REGEXP, RLIKE' ) ),
-			),
+                'description'       => __( 'Comparison operator to test the `meta_key`.', 'invoicing' ),
+                'type'              => 'string',
+                'default'              => '=',
+                'enum'        		=> array_map( 'trim', explode( ',', '=, !=, >, >=, <, <=, LIKE NOT, LIKE, IN, NOT IN, BETWEEN, NOT BETWEEN, NOT EXISTS, REGEXP, NOT REGEXP, RLIKE' ) ),
+            ),
 
             'meta_value'           => array(
-				'description'       => __( 'Filter items by custom field value.', 'invoicing' ),
-				'type'              => 'string',
-			),
+                'description'       => __( 'Filter items by custom field value.', 'invoicing' ),
+                'type'              => 'string',
+            ),
 
             'meta_compare'           => array(
-				'description'       => __( 'Comparison operator to test the `meta_value`.', 'invoicing' ),
-				'type'              => 'string',
-				'default'              => '=',
-				'enum'        		=> array_map( 'trim', explode( ',', '=, !=, >, >=, <, <=, LIKE NOT, LIKE, IN, NOT IN, BETWEEN, NOT BETWEEN, NOT EXISTS, REGEXP, NOT REGEXP, RLIKE' ) ),
-			),
-
-			'meta_value_num'           => array(
-				'description'       => __( 'Filter items by a numeric custom field value.', 'invoicing' ),
-				'type'              => 'integer',
-			),
-
-			// items after.
+                'description'       => __( 'Comparison operator to test the `meta_value`.', 'invoicing' ),
+                'type'              => 'string',
+                'default'              => '=',
+                'enum'        		=> array_map( 'trim', explode( ',', '=, !=, >, >=, <, <=, LIKE NOT, LIKE, IN, NOT IN, BETWEEN, NOT BETWEEN, NOT EXISTS, REGEXP, NOT REGEXP, RLIKE' ) ),
+            ),
+
+            'meta_value_num'           => array(
+                'description'       => __( 'Filter items by a numeric custom field value.', 'invoicing' ),
+                'type'              => 'integer',
+            ),
+
+            // items after.
             'after_date'            => array(
-				'description'       => __( 'Limit result set to items created after a specific date. Accepts strtotime()-compatible string.', 'invoicing' ),
-				'type'              => 'string',
+                'description'       => __( 'Limit result set to items created after a specific date. Accepts strtotime()-compatible string.', 'invoicing' ),
+                'type'              => 'string',
             ),
             
             // Number of results per page
             'limit'                 => array(
-				'description'       => __( 'Number of items to fetch.', 'invoicing' ),
-				'type'              => 'integer',
-				'default'           => (int) get_option( 'posts_per_page' ),
+                'description'       => __( 'Number of items to fetch.', 'invoicing' ),
+                'type'              => 'integer',
+                'default'           => (int) get_option( 'posts_per_page' ),
             ),
 
             // Pagination
             'page'     => array(
-				'description'       => __( 'Current page to fetch.', 'invoicing' ),
-				'type'              => 'integer',
-				'default'           => 1,
+                'description'       => __( 'Current page to fetch.', 'invoicing' ),
+                'type'              => 'integer',
+                'default'           => 1,
             ),
 
             // limit to certain items
@@ -603,9 +603,9 @@ 
                     'type' => 'integer',
                 ),
                 'default'     => array(),
-			),
+            ),
 			
-			// Exclude certain items
+            // Exclude certain items
             'exclude'  => array(
                 'description' => __( 'Ensure result set excludes specific IDs.', 'invoicing' ),
                 'type'        => 'array',
@@ -624,9 +624,9 @@ 
                     'date',
                     'id',
                     'modified',
-					'title',
-					'meta_value',
-					'meta_value_num'
+                    'title',
+                    'meta_value',
+                    'meta_value_num'
                 ),
             ),
 
@@ -639,932 +639,932 @@ 
             ),
         );
 
-		/**
-		 * Filter collection parameters for the invoices controller.
-		 *
-		 *
-		 * @since 1.0.13
-		 *
-		 * @param array        $query_params JSON Schema-formatted collection parameters.
-		 */
-		return apply_filters( "wpinv_rest_invoices_collection_params", $query_params );
-	}
+        /**
+         * Filter collection parameters for the invoices controller.
+         *
+         *
+         * @since 1.0.13
+         *
+         * @param array        $query_params JSON Schema-formatted collection parameters.
+         */
+        return apply_filters( "wpinv_rest_invoices_collection_params", $query_params );
+    }
 	
-	/**
-	 * Retrieves the request query params for the invoices collection.
-	 *
-	 * @since 1.0.15
-	 * @param WP_REST_Request $request Full details about the request.
-	 * @return array Request collection parameters.
-	 */
-	public function get_request_collection_params( $request ) {
+    /**
+     * Retrieves the request query params for the invoices collection.
+     *
+     * @since 1.0.15
+     * @param WP_REST_Request $request Full details about the request.
+     * @return array Request collection parameters.
+     */
+    public function get_request_collection_params( $request ) {
 		
-		// Retrieve the list of registered invoice query parameters.
-		$registered = $this->get_collection_params();
+        // Retrieve the list of registered invoice query parameters.
+        $registered = $this->get_collection_params();
 
-		// Default args
-		$args       = array(
+        // Default args
+        $args       = array(
             'status'                => $this->get_post_statuses(),
             'user'                  => null,
             'exclude_users'  	    => array(),
-			'before_date'           => null,
+            'before_date'           => null,
             'meta_key'              => null,
             'meta_compare_key'      => '=',
             'meta_value'            => null,
             'meta_compare'          => '=',
-			'meta_value_num'        => null,
+            'meta_value_num'        => null,
             'after_date'            => null,
             'limit'                 => (int) get_option( 'posts_per_page' ),
-			'page'     				=> 1,
-			'include'				=> array(),
+            'page'     				=> 1,
+            'include'				=> array(),
             'exclude'  				=> array(),
             'orderby'  		  		=> 'date',
             'order'    				=> 'DESC',
-		);
+        );
 
-		// Add any params from the requests.
-		foreach ( array_keys( $registered ) as $key ) {
+        // Add any params from the requests.
+        foreach ( array_keys( $registered ) as $key ) {
             if ( isset( $request[ $key] ) ) {
                 $args[ $key ] = $request[ $key];
             }
         }
 		
-		/**
-		 * Filters the requests collection parameters for the invoices controller.
-		 *
-		 *
-		 * @since 1.0.15
-		 *
-		 * @param array           $args    Request query args.
-		 * @param WP_REST_Request $request Full details about the request.
-		 */
-		return apply_filters( "wpinv_rest_invoices_collection_request_params", $args, $request );
-	}
+        /**
+         * Filters the requests collection parameters for the invoices controller.
+         *
+         *
+         * @since 1.0.15
+         *
+         * @param array           $args    Request query args.
+         * @param WP_REST_Request $request Full details about the request.
+         */
+        return apply_filters( "wpinv_rest_invoices_collection_request_params", $args, $request );
+    }
 	
-	/**
-	 * Retrieves the WP_Query params for the invoices collection.
-	 *
-	 * @since 1.0.15
-	 * @param array           $args Request args.
-	 * @param WP_REST_Request $request Full details about the request.
-	 * @return array WP_Query parameters.
-	 */
-	public function get_collection_wp_query_params( $args, $request ) {
+    /**
+     * Retrieves the WP_Query params for the invoices collection.
+     *
+     * @since 1.0.15
+     * @param array           $args Request args.
+     * @param WP_REST_Request $request Full details about the request.
+     * @return array WP_Query parameters.
+     */
+    public function get_collection_wp_query_params( $args, $request ) {
 		
-		// Prepare the parameters.
-		$wp_query_args = array(
-			'post_type'        => $this->post_type,
-			'post_status'      => $args['status'],
-			'author'           => $args['user'],
-			'author__not_in'   => $args['exclude_users'],
-			'posts_per_page'   => $args['limit'],
-			'paged'            => $args['page'],
-			'meta_key'         => $args['meta_key'],
-			'meta_compare_key' => $args['meta_compare_key'],
-			'meta_value'       => $args['meta_value'],
-			'meta_compare'     => $args['meta_compare'],
-			'meta_value_num'   => $args['meta_value_num'],
-			'post__in'         => $args['include'],
-			'post__in'         => $args['exclude'],
-			'date_query'       => array( array() ),
-			'fields'           => 'ids',
-			'orderby'          => $args['orderby'],
-			'order'            => $args['order'],
-		);
-
-		// Only admins can view other user's invoices.
-		if ( ! wpinv_current_user_can_manage_invoicing() ) {
-			$wp_query_args['author'] = get_current_user_id();
-		}
-
-		// No date specific params provided.
-		if ( empty( $args['before_date'] ) && empty( $args['after_date'] ) ) {
-			unset( $wp_query_args['date_query'] );
-		}
-
-		if ( ! empty( $args['before_date'] ) ) {
-			$wp_query_args['date_query'][0]['before'] = $args['before_date'];
-		}
-
-		if ( ! empty( $args['after_date'] ) ) {
-			$wp_query_args['date_query'][0]['after'] = $args['after_date'];
-		}
-
-		// Remove empty variables.
-		$wp_query_args = array_filter( $wp_query_args );
-
-		// This can be zero.
-		if ( ! is_null( $args['meta_value_num'] ) ) {
-			$wp_query_args['meta_value_num'] = $args['meta_value_num'];
-		}
+        // Prepare the parameters.
+        $wp_query_args = array(
+            'post_type'        => $this->post_type,
+            'post_status'      => $args['status'],
+            'author'           => $args['user'],
+            'author__not_in'   => $args['exclude_users'],
+            'posts_per_page'   => $args['limit'],
+            'paged'            => $args['page'],
+            'meta_key'         => $args['meta_key'],
+            'meta_compare_key' => $args['meta_compare_key'],
+            'meta_value'       => $args['meta_value'],
+            'meta_compare'     => $args['meta_compare'],
+            'meta_value_num'   => $args['meta_value_num'],
+            'post__in'         => $args['include'],
+            'post__in'         => $args['exclude'],
+            'date_query'       => array( array() ),
+            'fields'           => 'ids',
+            'orderby'          => $args['orderby'],
+            'order'            => $args['order'],
+        );
+
+        // Only admins can view other user's invoices.
+        if ( ! wpinv_current_user_can_manage_invoicing() ) {
+            $wp_query_args['author'] = get_current_user_id();
+        }
+
+        // No date specific params provided.
+        if ( empty( $args['before_date'] ) && empty( $args['after_date'] ) ) {
+            unset( $wp_query_args['date_query'] );
+        }
+
+        if ( ! empty( $args['before_date'] ) ) {
+            $wp_query_args['date_query'][0]['before'] = $args['before_date'];
+        }
+
+        if ( ! empty( $args['after_date'] ) ) {
+            $wp_query_args['date_query'][0]['after'] = $args['after_date'];
+        }
+
+        // Remove empty variables.
+        $wp_query_args = array_filter( $wp_query_args );
+
+        // This can be zero.
+        if ( ! is_null( $args['meta_value_num'] ) ) {
+            $wp_query_args['meta_value_num'] = $args['meta_value_num'];
+        }
 		
-		/**
-		 * Filters the invoices collection WP_Query parameters for the invoices controller.
-		 *
-		 *
-		 * @since 1.0.15
-		 *
-		 * @param array           $args          Request args.
-		 * @param array           $wp_query_args Generated WP_Query args args.
-		 * @param WP_REST_Request $request       Full details about the request.
-		 */
-		return apply_filters( "wpinv_rest_invoices_collection_wp_query_params", $wp_query_args, $args, $request );
+        /**
+         * Filters the invoices collection WP_Query parameters for the invoices controller.
+         *
+         *
+         * @since 1.0.15
+         *
+         * @param array           $args          Request args.
+         * @param array           $wp_query_args Generated WP_Query args args.
+         * @param WP_REST_Request $request       Full details about the request.
+         */
+        return apply_filters( "wpinv_rest_invoices_collection_wp_query_params", $wp_query_args, $args, $request );
     }
     
     /**
-	 * Checks if a given post type can be viewed or managed.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param object|string $post_type Post type name or object.
-	 * @return bool Whether the post type is allowed in REST.
-	 */
-	protected function check_is_post_type_allowed( $post_type ) {
-		return true;
-	}
-
-	/**
-	 * Prepares a single invoice for create or update.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WP_REST_Request $request Request object.
-	 * @return array|WP_Error Invoice Properties or WP_Error.
-	 */
-	protected function prepare_item_for_database( $request ) {
-		$prepared_invoice = new stdClass();
-
-		// Post ID.
-		if ( isset( $request['id'] ) ) {
-			$existing_invoice = $this->get_post( $request['id'] );
-			if ( is_wp_error( $existing_invoice ) ) {
-				return $existing_invoice;
-			}
-
-			$prepared_invoice->ID 		  = $existing_invoice->ID;
-			$prepared_invoice->invoice_id = $existing_invoice->ID;
-		}
-
-		$schema = $this->get_item_schema();
-
-		// Invoice owner.
-		if ( ! empty( $schema['properties']['user_id'] ) && isset( $request['user_id'] ) ) {
-			$prepared_invoice->user_id = (int) $request['user_id'];
-		}
-
-		// Cart details.
-		if ( ! empty( $schema['properties']['cart_details'] ) && isset( $request['cart_details'] ) ) {
-			$prepared_invoice->cart_details = (array) $request['cart_details'];
-		}
-
-		// Invoice status.
-		if ( ! empty( $schema['properties']['status'] ) && isset( $request['status'] ) ) {
-
-			if ( in_array( $request['status'], $this->get_post_statuses(), true ) ) {
-				$prepared_invoice->status = $request['status'];
-			}
-
-		}
-
-		// User info
-		if ( ! empty( $schema['properties']['user_info'] ) && isset( $request['user_info'] ) ) {
-			$prepared_invoice->user_info = array();
-			$user_info = (array) $request['user_info'];
-
-			foreach( $user_info as $prop => $value ) {
-
-				if ( ! empty( $schema['properties']['user_info']['properties'][$prop] ) ) {
-
-					$prepared_invoice->user_info[$prop] = $value;
+     * Checks if a given post type can be viewed or managed.
+     *
+     * @since 1.0.13
+     *
+     * @param object|string $post_type Post type name or object.
+     * @return bool Whether the post type is allowed in REST.
+     */
+    protected function check_is_post_type_allowed( $post_type ) {
+        return true;
+    }
+
+    /**
+     * Prepares a single invoice for create or update.
+     *
+     * @since 1.0.13
+     *
+     * @param WP_REST_Request $request Request object.
+     * @return array|WP_Error Invoice Properties or WP_Error.
+     */
+    protected function prepare_item_for_database( $request ) {
+        $prepared_invoice = new stdClass();
+
+        // Post ID.
+        if ( isset( $request['id'] ) ) {
+            $existing_invoice = $this->get_post( $request['id'] );
+            if ( is_wp_error( $existing_invoice ) ) {
+                return $existing_invoice;
+            }
+
+            $prepared_invoice->ID 		  = $existing_invoice->ID;
+            $prepared_invoice->invoice_id = $existing_invoice->ID;
+        }
+
+        $schema = $this->get_item_schema();
+
+        // Invoice owner.
+        if ( ! empty( $schema['properties']['user_id'] ) && isset( $request['user_id'] ) ) {
+            $prepared_invoice->user_id = (int) $request['user_id'];
+        }
+
+        // Cart details.
+        if ( ! empty( $schema['properties']['cart_details'] ) && isset( $request['cart_details'] ) ) {
+            $prepared_invoice->cart_details = (array) $request['cart_details'];
+        }
+
+        // Invoice status.
+        if ( ! empty( $schema['properties']['status'] ) && isset( $request['status'] ) ) {
+
+            if ( in_array( $request['status'], $this->get_post_statuses(), true ) ) {
+                $prepared_invoice->status = $request['status'];
+            }
+
+        }
+
+        // User info
+        if ( ! empty( $schema['properties']['user_info'] ) && isset( $request['user_info'] ) ) {
+            $prepared_invoice->user_info = array();
+            $user_info = (array) $request['user_info'];
+
+            foreach( $user_info as $prop => $value ) {
+
+                if ( ! empty( $schema['properties']['user_info']['properties'][$prop] ) ) {
+
+                    $prepared_invoice->user_info[$prop] = $value;
 		
-				}
+                }
 
-			}
+            }
 
-		}
+        }
 
-		// IP
-		if ( ! empty( $schema['properties']['ip'] ) && isset( $request['ip'] ) ) {
-			$prepared_invoice->ip = $request['ip'];
-		}
+        // IP
+        if ( ! empty( $schema['properties']['ip'] ) && isset( $request['ip'] ) ) {
+            $prepared_invoice->ip = $request['ip'];
+        }
 
-		// Payment details
-		$prepared_invoice->payment_details = array();
+        // Payment details
+        $prepared_invoice->payment_details = array();
 
-		if ( ! empty( $schema['properties']['gateway'] ) && isset( $request['gateway'] ) ) {
-			$prepared_invoice->payment_details['gateway'] = $request['gateway'];
-		}
+        if ( ! empty( $schema['properties']['gateway'] ) && isset( $request['gateway'] ) ) {
+            $prepared_invoice->payment_details['gateway'] = $request['gateway'];
+        }
 
-		if ( ! empty( $schema['properties']['gateway_title'] ) && isset( $request['gateway_title'] ) ) {
-			$prepared_invoice->payment_details['gateway_title'] = $request['gateway_title'];
-		}
+        if ( ! empty( $schema['properties']['gateway_title'] ) && isset( $request['gateway_title'] ) ) {
+            $prepared_invoice->payment_details['gateway_title'] = $request['gateway_title'];
+        }
 
-		if ( ! empty( $schema['properties']['currency'] ) && isset( $request['currency'] ) ) {
-			$prepared_invoice->payment_details['currency'] = $request['currency'];
-		}
+        if ( ! empty( $schema['properties']['currency'] ) && isset( $request['currency'] ) ) {
+            $prepared_invoice->payment_details['currency'] = $request['currency'];
+        }
 
-		if ( ! empty( $schema['properties']['transaction_id'] ) && isset( $request['transaction_id'] ) ) {
-			$prepared_invoice->payment_details['transaction_id'] = $request['transaction_id'];
-		}
+        if ( ! empty( $schema['properties']['transaction_id'] ) && isset( $request['transaction_id'] ) ) {
+            $prepared_invoice->payment_details['transaction_id'] = $request['transaction_id'];
+        }
 
-		// Dates
-		if ( ! empty( $schema['properties']['date'] ) && isset( $request['date'] ) ) {
-			$post_date = rest_get_date_with_gmt( $request['date'] );
+        // Dates
+        if ( ! empty( $schema['properties']['date'] ) && isset( $request['date'] ) ) {
+            $post_date = rest_get_date_with_gmt( $request['date'] );
 
-			if ( ! empty( $post_date ) ) {
-				$prepared_invoice->post_date = $post_date[0];
-			}
+            if ( ! empty( $post_date ) ) {
+                $prepared_invoice->post_date = $post_date[0];
+            }
 			
-		}
+        }
 
-		if ( ! empty( $schema['properties']['due_date'] ) && isset( $request['due_date'] ) ) {
-			$due_date = rest_get_date_with_gmt( $request['due_date'] );
+        if ( ! empty( $schema['properties']['due_date'] ) && isset( $request['due_date'] ) ) {
+            $due_date = rest_get_date_with_gmt( $request['due_date'] );
 
-			if ( ! empty( $due_date ) ) {
-				$prepared_invoice->due_date = $due_date[0];
-			}
+            if ( ! empty( $due_date ) ) {
+                $prepared_invoice->due_date = $due_date[0];
+            }
 
-		}
+        }
 
-		if ( ! empty( $schema['properties']['valid_until'] ) && isset( $request['valid_until'] ) ) {
+        if ( ! empty( $schema['properties']['valid_until'] ) && isset( $request['valid_until'] ) ) {
 
-			if ( ! empty( $request['valid_until'] ) ) {
-				$prepared_invoice->valid_until = gmdate( 'Y-m-d', strtotime( $request['valid_until'] ) );
-			} else {
-				$prepared_invoice->valid_until = '';
-			}
+            if ( ! empty( $request['valid_until'] ) ) {
+                $prepared_invoice->valid_until = gmdate( 'Y-m-d', strtotime( $request['valid_until'] ) );
+            } else {
+                $prepared_invoice->valid_until = '';
+            }
 
-		}
+        }
 
-		$invoice_data = (array) wp_unslash( $prepared_invoice );
+        $invoice_data = (array) wp_unslash( $prepared_invoice );
 
-		/**
-		 * Filters an invoice before it is inserted via the REST API.
-		 *
-		 * @since 1.0.13
-		 *
-		 * @param array        $invoice_data An array of invoice data
-		 * @param WP_REST_Request $request       Request object.
-		 */
-		return apply_filters( "wpinv_rest_pre_insert_invoice", $invoice_data, $request );
+        /**
+         * Filters an invoice before it is inserted via the REST API.
+         *
+         * @since 1.0.13
+         *
+         * @param array        $invoice_data An array of invoice data
+         * @param WP_REST_Request $request       Request object.
+         */
+        return apply_filters( "wpinv_rest_pre_insert_invoice", $invoice_data, $request );
 
-	}
+    }
 
-	/**
-	 * Prepares a single invoice output for response.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WPInv_Invoice   $invoice    Invoice object.
-	 * @param WP_REST_Request $request Request object.
-	 * @return WP_REST_Response Response object.
-	 */
-	public function prepare_item_for_response( $invoice, $request ) {
+    /**
+     * Prepares a single invoice output for response.
+     *
+     * @since 1.0.13
+     *
+     * @param WPInv_Invoice   $invoice    Invoice object.
+     * @param WP_REST_Request $request Request object.
+     * @return WP_REST_Response Response object.
+     */
+    public function prepare_item_for_response( $invoice, $request ) {
 
-		$GLOBALS['post'] = get_post( $invoice->ID );
+        $GLOBALS['post'] = get_post( $invoice->ID );
 
-		setup_postdata( $invoice->ID );
+        setup_postdata( $invoice->ID );
 
-		// Fetch the fields to include in this response.
-		$fields = $this->get_fields_for_response( $request );
+        // Fetch the fields to include in this response.
+        $fields = $this->get_fields_for_response( $request );
 
-		// Base fields for every invoice.
-		$data = array();
+        // Base fields for every invoice.
+        $data = array();
 
-		// Set up ID
-		if ( rest_is_field_included( 'id', $fields ) ) {
-			$data['id'] = $invoice->ID;
-		}
+        // Set up ID
+        if ( rest_is_field_included( 'id', $fields ) ) {
+            $data['id'] = $invoice->ID;
+        }
 
 
-		// Basic properties
-		$invoice_properties = array(
-			'title', 'email', 'ip', 
-			'key', 'number', 'transaction_id', 'mode',
-			'gateway', 'gateway_title',
-			'total', 'discount', 'discount_code', 
-			'tax', 'fees_total', 'subtotal', 'currency',
-			'status', 'status_nicename', 'post_type'
-		);
-
-		foreach( $invoice_properties as $property ) {
+        // Basic properties
+        $invoice_properties = array(
+            'title', 'email', 'ip', 
+            'key', 'number', 'transaction_id', 'mode',
+            'gateway', 'gateway_title',
+            'total', 'discount', 'discount_code', 
+            'tax', 'fees_total', 'subtotal', 'currency',
+            'status', 'status_nicename', 'post_type'
+        );
 
-			if ( rest_is_field_included( $property, $fields ) ) {
-				$data[$property] = $invoice->get( $property );
-			}
-
-		}
-
-		// Valid until
-		if ( rest_is_field_included( 'valid_until', $fields ) && $this->post_type === 'wpi_quote' ) {
-			$data['valid_until'] = get_post_meta( $invoice->ID, 'wpinv_quote_valid_until', true );
-		}
-
-		// Cart details
-		if ( rest_is_field_included( 'cart_details', $fields ) ) {
-			$data['cart_details'] = $invoice->get( 'cart_details' );
-		}
-
-		//Dates
-		$invoice_properties = array( 'date', 'due_date', 'completed_date' );
-
-		foreach( $invoice_properties as $property ) {
-
-			if ( rest_is_field_included( $property, $fields ) ) {
-				$data[$property] = $this->prepare_date_response( '0000-00-00 00:00:00', $invoice->get( $property ) );
-			}
-
-		}
-
-		// User id
-		if ( rest_is_field_included( 'user_id', $fields ) ) {
-			$data['user_id'] = (int) $invoice->get( 'user_id' );
-		}
-
-		// User info
-		$user_info = array( 'first_name', 'last_name', 'company', 'vat_number', 'vat_rate', 'address', 'city', 'country', 'state', 'zip', 'phone' );
-
-		foreach( $user_info as $property ) {
-
-			if ( rest_is_field_included( "user_info.$property", $fields ) ) {
-				$data['user_info'][$property] = $invoice->get( $property );
-			}
-
-		}
-
-		// Slug
-		if ( rest_is_field_included( 'slug', $fields ) ) {
-			$data['slug'] = $invoice->get( 'post_name' );
-		}
-
-		// View invoice link
-		if ( rest_is_field_included( 'link', $fields ) ) {
-			$data['link'] = esc_url( $invoice->get_view_url() );
-		}
-
-
-		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
-		$data    = $this->add_additional_fields_to_object( $data, $request );
-		$data    = $this->filter_response_by_context( $data, $context );
-
-		// Wrap the data in a response object.
-		$response = rest_ensure_response( $data );
-
-		$links = $this->prepare_links( $invoice );
-		$response->add_links( $links );
-
-		if ( ! empty( $links['self']['href'] ) ) {
-			$actions = $this->get_available_actions( $invoice, $request );
-
-			$self = $links['self']['href'];
-
-			foreach ( $actions as $rel ) {
-				$response->add_link( $rel, $self );
-			}
-		}
-
-		/**
-		 * Filters the invoice data for a response.
-		 *
-		 * @since 1.0.13
-		 *
-		 * @param WP_REST_Response $response The response object.
-		 * @param WPInv_Invoice    $invoice  The invoice object.
-		 * @param WP_REST_Request  $request  Request object.
-		 */
-		return apply_filters( "wpinv_rest_prepare_invoice", $response, $invoice, $request );
-	}
-
-	/**
-	 * Gets an array of fields to be included on the response.
-	 *
-	 * Included fields are based on item schema and `_fields=` request argument.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WP_REST_Request $request Full details about the request.
-	 * @return array Fields to be included in the response.
-	 */
-	public function get_fields_for_response( $request ) {
-		$schema     = $this->get_item_schema();
-		$properties = isset( $schema['properties'] ) ? $schema['properties'] : array();
-
-		$additional_fields = $this->get_additional_fields();
-		foreach ( $additional_fields as $field_name => $field_options ) {
-			// For back-compat, include any field with an empty schema
-			// because it won't be present in $this->get_item_schema().
-			if ( is_null( $field_options['schema'] ) ) {
-				$properties[ $field_name ] = $field_options;
-			}
-		}
-
-		// Exclude fields that specify a different context than the request context.
-		$context = $request['context'];
-		if ( $context ) {
-			foreach ( $properties as $name => $options ) {
-				if ( ! empty( $options['context'] ) && ! in_array( $context, $options['context'], true ) ) {
-					unset( $properties[ $name ] );
-				}
-			}
-		}
-
-		$fields = array_keys( $properties );
-
-		if ( ! isset( $request['_fields'] ) ) {
-			return $fields;
-		}
-		$requested_fields = wpinv_parse_list( $request['_fields'] );
-		if ( 0 === count( $requested_fields ) ) {
-			return $fields;
-		}
-		// Trim off outside whitespace from the comma delimited list.
-		$requested_fields = array_map( 'trim', $requested_fields );
-		// Always persist 'id', because it can be needed for add_additional_fields_to_object().
-		if ( in_array( 'id', $fields, true ) ) {
-			$requested_fields[] = 'id';
-		}
-		// Return the list of all requested fields which appear in the schema.
-		return array_reduce(
-			$requested_fields,
-			function( $response_fields, $field ) use ( $fields ) {
-				if ( in_array( $field, $fields, true ) ) {
-					$response_fields[] = $field;
-					return $response_fields;
-				}
-				// Check for nested fields if $field is not a direct match.
-				$nested_fields = explode( '.', $field );
-				// A nested field is included so long as its top-level property is
-				// present in the schema.
-				if ( in_array( $nested_fields[0], $fields, true ) ) {
-					$response_fields[] = $field;
-				}
-				return $response_fields;
-			},
-			array()
-		);
-	}
-
-	/**
-	 * Retrieves the invoice's schema, conforming to JSON Schema.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @return array Invoice schema data.
-	 */
-	public function get_item_schema() {
-
-		// Maybe retrieve the schema from cache.
-		if ( $this->schema ) {
-			return $this->add_additional_fields_schema( $this->schema );
-		}
-
-		$schema = array(
-			'$schema'    => 'http://json-schema.org/draft-04/schema#',
-			'title'      => $this->post_type,
-			'type'       => 'object',
-
-			// Base properties for every Invoice.
-			'properties' 		  => array(
-
-				'title'			  => array(
-					'description' => __( 'The title for the invoice.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'readonly'    => true,
-				),
-
-				'user_id'		  => array(
-					'description' => __( 'The ID of the owner of the invoice.', 'invoicing' ),
-					'type'        => 'integer',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'email'		  	  => array(
-					'description' => __( 'The email of the owner of the invoice.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'readonly'    => true,
-				),
-
-				'ip'			  => array(
-					'description' => __( 'The IP of the owner of the invoice.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'user_info'       => array(
-					'description' => __( 'Information about the owner of the invoice.', 'invoicing' ),
-					'type'        => 'object',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'properties'  => array(
-
-						'first_name'      => array(
-							'description' => __( 'The first name of the owner of the invoice.', 'invoicing' ),
-							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
-						),
-
-						'last_name'       => array(
-							'description' => __( 'The last name of the owner of the invoice.', 'invoicing' ),
-							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
-						),
-
-						'company'         => array(
-							'description' => __( 'The company of the owner of the invoice.', 'invoicing' ),
-							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
-						),
-
-						'vat_number'      => array(
-							'description' => __( 'The VAT number of the owner of the invoice.', 'invoicing' ),
-							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
-						),
-
-						'vat_rate'        => array(
-							'description' => __( 'The VAT rate applied on the invoice.', 'invoicing' ),
-							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
-						),
-
-						'address'        => array(
-							'description' => __( 'The address of the invoice owner.', 'invoicing' ),
-							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
-						),
-
-						'city'            => array(
-							'description' => __( 'The city of the invoice owner.', 'invoicing' ),
-							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
-						),
-
-						'country'         => array(
-							'description' => __( 'The country of the invoice owner.', 'invoicing' ),
-							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
-						),
-
-						'state'           => array(
-							'description' => __( 'The state of the invoice owner.', 'invoicing' ),
-							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
-						),
-
-						'zip'             => array(
-							'description' => __( 'The zip code of the invoice owner.', 'invoicing' ),
-							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
-						),
-
-						'phone'             => array(
-							'description' => __( 'The phone number of the invoice owner.', 'invoicing' ),
-							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
-						),
-					),
-				),
-
-				'id'           => array(
-					'description' => __( 'Unique identifier for the invoice.', 'invoicing' ),
-					'type'        => 'integer',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'readonly'    => true,
-				),
-
-				'key'			  => array(
-					'description' => __( 'A unique key for the invoice.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'readonly'    => true,
-				),
-
-				'number'		  => array(
-					'description' => __( 'The invoice number.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'readonly'    => true,
-				),
-
-				'transaction_id'  => array(
-					'description' => __( 'The transaction id of the invoice.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'gateway'		  => array(
-					'description' => __( 'The gateway used to process the invoice.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'gateway_title'	  => array(
-					'description' => __( 'The title of the gateway used to process the invoice.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'total'	  		  => array(
-					'description' => __( 'The total amount of the invoice.', 'invoicing' ),
-					'type'        => 'number',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'readonly'    => true,
-				),
-
-				'discount'		  => array(
-					'description' => __( 'The discount applied to the invoice.', 'invoicing' ),
-					'type'        => 'number',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'readonly'    => true,
-				),
-
-				'discount_code'	  => array(
-					'description' => __( 'The discount code applied to the invoice.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'readonly'    => true,
-				),
-
-				'tax'	  		  => array(
-					'description' => __( 'The tax applied to the invoice.', 'invoicing' ),
-					'type'        => 'number',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'readonly'    => true,
-				),
-
-				'fees_total'	  => array(
-					'description' => __( 'The total fees applied to the invoice.', 'invoicing' ),
-					'type'        => 'number',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'readonly'    => true,
-				),
-
-				'subtotal'	  	  => array(
-					'description' => __( 'The sub-total for the invoice.', 'invoicing' ),
-					'type'        => 'number',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'readonly'    => true,
-				),
-
-				'currency'	  	  => array(
-					'description' => __( 'The currency used to process the invoice.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'cart_details'	  => array(
-					'description' => __( 'The cart details for invoice.', 'invoicing' ),
-					'type'        => 'array',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'required'	  => true,
-				),
-
-				'date'         => array(
-					'description' => __( "The date the invoice was published, in the site's timezone.", 'invoicing' ),
-					'type'        => array( 'string', 'null' ),
-					'format'      => 'date-time',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'due_date'     => array(
-					'description' => __( 'The due date for the invoice.', 'invoicing' ),
-					'type'        => array( 'string', 'null' ),
-					'format'      => 'date-time',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'completed_date'  => array(
-					'description' => __( 'The completed date for the invoice.', 'invoicing' ),
-					'type'        => array( 'string', 'null' ),
-					'format'      => 'date-time',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'readonly'    => true,
-				),
+        foreach( $invoice_properties as $property ) {
+
+            if ( rest_is_field_included( $property, $fields ) ) {
+                $data[$property] = $invoice->get( $property );
+            }
+
+        }
+
+        // Valid until
+        if ( rest_is_field_included( 'valid_until', $fields ) && $this->post_type === 'wpi_quote' ) {
+            $data['valid_until'] = get_post_meta( $invoice->ID, 'wpinv_quote_valid_until', true );
+        }
+
+        // Cart details
+        if ( rest_is_field_included( 'cart_details', $fields ) ) {
+            $data['cart_details'] = $invoice->get( 'cart_details' );
+        }
+
+        //Dates
+        $invoice_properties = array( 'date', 'due_date', 'completed_date' );
+
+        foreach( $invoice_properties as $property ) {
+
+            if ( rest_is_field_included( $property, $fields ) ) {
+                $data[$property] = $this->prepare_date_response( '0000-00-00 00:00:00', $invoice->get( $property ) );
+            }
+
+        }
+
+        // User id
+        if ( rest_is_field_included( 'user_id', $fields ) ) {
+            $data['user_id'] = (int) $invoice->get( 'user_id' );
+        }
+
+        // User info
+        $user_info = array( 'first_name', 'last_name', 'company', 'vat_number', 'vat_rate', 'address', 'city', 'country', 'state', 'zip', 'phone' );
+
+        foreach( $user_info as $property ) {
+
+            if ( rest_is_field_included( "user_info.$property", $fields ) ) {
+                $data['user_info'][$property] = $invoice->get( $property );
+            }
+
+        }
+
+        // Slug
+        if ( rest_is_field_included( 'slug', $fields ) ) {
+            $data['slug'] = $invoice->get( 'post_name' );
+        }
+
+        // View invoice link
+        if ( rest_is_field_included( 'link', $fields ) ) {
+            $data['link'] = esc_url( $invoice->get_view_url() );
+        }
+
+
+        $context = ! empty( $request['context'] ) ? $request['context'] : 'view';
+        $data    = $this->add_additional_fields_to_object( $data, $request );
+        $data    = $this->filter_response_by_context( $data, $context );
+
+        // Wrap the data in a response object.
+        $response = rest_ensure_response( $data );
+
+        $links = $this->prepare_links( $invoice );
+        $response->add_links( $links );
+
+        if ( ! empty( $links['self']['href'] ) ) {
+            $actions = $this->get_available_actions( $invoice, $request );
+
+            $self = $links['self']['href'];
+
+            foreach ( $actions as $rel ) {
+                $response->add_link( $rel, $self );
+            }
+        }
+
+        /**
+         * Filters the invoice data for a response.
+         *
+         * @since 1.0.13
+         *
+         * @param WP_REST_Response $response The response object.
+         * @param WPInv_Invoice    $invoice  The invoice object.
+         * @param WP_REST_Request  $request  Request object.
+         */
+        return apply_filters( "wpinv_rest_prepare_invoice", $response, $invoice, $request );
+    }
+
+    /**
+     * Gets an array of fields to be included on the response.
+     *
+     * Included fields are based on item schema and `_fields=` request argument.
+     *
+     * @since 1.0.13
+     *
+     * @param WP_REST_Request $request Full details about the request.
+     * @return array Fields to be included in the response.
+     */
+    public function get_fields_for_response( $request ) {
+        $schema     = $this->get_item_schema();
+        $properties = isset( $schema['properties'] ) ? $schema['properties'] : array();
+
+        $additional_fields = $this->get_additional_fields();
+        foreach ( $additional_fields as $field_name => $field_options ) {
+            // For back-compat, include any field with an empty schema
+            // because it won't be present in $this->get_item_schema().
+            if ( is_null( $field_options['schema'] ) ) {
+                $properties[ $field_name ] = $field_options;
+            }
+        }
+
+        // Exclude fields that specify a different context than the request context.
+        $context = $request['context'];
+        if ( $context ) {
+            foreach ( $properties as $name => $options ) {
+                if ( ! empty( $options['context'] ) && ! in_array( $context, $options['context'], true ) ) {
+                    unset( $properties[ $name ] );
+                }
+            }
+        }
+
+        $fields = array_keys( $properties );
+
+        if ( ! isset( $request['_fields'] ) ) {
+            return $fields;
+        }
+        $requested_fields = wpinv_parse_list( $request['_fields'] );
+        if ( 0 === count( $requested_fields ) ) {
+            return $fields;
+        }
+        // Trim off outside whitespace from the comma delimited list.
+        $requested_fields = array_map( 'trim', $requested_fields );
+        // Always persist 'id', because it can be needed for add_additional_fields_to_object().
+        if ( in_array( 'id', $fields, true ) ) {
+            $requested_fields[] = 'id';
+        }
+        // Return the list of all requested fields which appear in the schema.
+        return array_reduce(
+            $requested_fields,
+            function( $response_fields, $field ) use ( $fields ) {
+                if ( in_array( $field, $fields, true ) ) {
+                    $response_fields[] = $field;
+                    return $response_fields;
+                }
+                // Check for nested fields if $field is not a direct match.
+                $nested_fields = explode( '.', $field );
+                // A nested field is included so long as its top-level property is
+                // present in the schema.
+                if ( in_array( $nested_fields[0], $fields, true ) ) {
+                    $response_fields[] = $field;
+                }
+                return $response_fields;
+            },
+            array()
+        );
+    }
+
+    /**
+     * Retrieves the invoice's schema, conforming to JSON Schema.
+     *
+     * @since 1.0.13
+     *
+     * @return array Invoice schema data.
+     */
+    public function get_item_schema() {
+
+        // Maybe retrieve the schema from cache.
+        if ( $this->schema ) {
+            return $this->add_additional_fields_schema( $this->schema );
+        }
+
+        $schema = array(
+            '$schema'    => 'http://json-schema.org/draft-04/schema#',
+            'title'      => $this->post_type,
+            'type'       => 'object',
+
+            // Base properties for every Invoice.
+            'properties' 		  => array(
+
+                'title'			  => array(
+                    'description' => __( 'The title for the invoice.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'readonly'    => true,
+                ),
+
+                'user_id'		  => array(
+                    'description' => __( 'The ID of the owner of the invoice.', 'invoicing' ),
+                    'type'        => 'integer',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'email'		  	  => array(
+                    'description' => __( 'The email of the owner of the invoice.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'readonly'    => true,
+                ),
+
+                'ip'			  => array(
+                    'description' => __( 'The IP of the owner of the invoice.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'user_info'       => array(
+                    'description' => __( 'Information about the owner of the invoice.', 'invoicing' ),
+                    'type'        => 'object',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'properties'  => array(
+
+                        'first_name'      => array(
+                            'description' => __( 'The first name of the owner of the invoice.', 'invoicing' ),
+                            'type'        => 'string',
+                            'context'     => array( 'view', 'edit', 'embed' ),
+                        ),
+
+                        'last_name'       => array(
+                            'description' => __( 'The last name of the owner of the invoice.', 'invoicing' ),
+                            'type'        => 'string',
+                            'context'     => array( 'view', 'edit', 'embed' ),
+                        ),
+
+                        'company'         => array(
+                            'description' => __( 'The company of the owner of the invoice.', 'invoicing' ),
+                            'type'        => 'string',
+                            'context'     => array( 'view', 'edit', 'embed' ),
+                        ),
+
+                        'vat_number'      => array(
+                            'description' => __( 'The VAT number of the owner of the invoice.', 'invoicing' ),
+                            'type'        => 'string',
+                            'context'     => array( 'view', 'edit', 'embed' ),
+                        ),
+
+                        'vat_rate'        => array(
+                            'description' => __( 'The VAT rate applied on the invoice.', 'invoicing' ),
+                            'type'        => 'string',
+                            'context'     => array( 'view', 'edit', 'embed' ),
+                        ),
+
+                        'address'        => array(
+                            'description' => __( 'The address of the invoice owner.', 'invoicing' ),
+                            'type'        => 'string',
+                            'context'     => array( 'view', 'edit', 'embed' ),
+                        ),
+
+                        'city'            => array(
+                            'description' => __( 'The city of the invoice owner.', 'invoicing' ),
+                            'type'        => 'string',
+                            'context'     => array( 'view', 'edit', 'embed' ),
+                        ),
+
+                        'country'         => array(
+                            'description' => __( 'The country of the invoice owner.', 'invoicing' ),
+                            'type'        => 'string',
+                            'context'     => array( 'view', 'edit', 'embed' ),
+                        ),
+
+                        'state'           => array(
+                            'description' => __( 'The state of the invoice owner.', 'invoicing' ),
+                            'type'        => 'string',
+                            'context'     => array( 'view', 'edit', 'embed' ),
+                        ),
+
+                        'zip'             => array(
+                            'description' => __( 'The zip code of the invoice owner.', 'invoicing' ),
+                            'type'        => 'string',
+                            'context'     => array( 'view', 'edit', 'embed' ),
+                        ),
+
+                        'phone'             => array(
+                            'description' => __( 'The phone number of the invoice owner.', 'invoicing' ),
+                            'type'        => 'string',
+                            'context'     => array( 'view', 'edit', 'embed' ),
+                        ),
+                    ),
+                ),
+
+                'id'           => array(
+                    'description' => __( 'Unique identifier for the invoice.', 'invoicing' ),
+                    'type'        => 'integer',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'readonly'    => true,
+                ),
+
+                'key'			  => array(
+                    'description' => __( 'A unique key for the invoice.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'readonly'    => true,
+                ),
+
+                'number'		  => array(
+                    'description' => __( 'The invoice number.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'readonly'    => true,
+                ),
+
+                'transaction_id'  => array(
+                    'description' => __( 'The transaction id of the invoice.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'gateway'		  => array(
+                    'description' => __( 'The gateway used to process the invoice.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'gateway_title'	  => array(
+                    'description' => __( 'The title of the gateway used to process the invoice.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'total'	  		  => array(
+                    'description' => __( 'The total amount of the invoice.', 'invoicing' ),
+                    'type'        => 'number',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'readonly'    => true,
+                ),
+
+                'discount'		  => array(
+                    'description' => __( 'The discount applied to the invoice.', 'invoicing' ),
+                    'type'        => 'number',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'readonly'    => true,
+                ),
+
+                'discount_code'	  => array(
+                    'description' => __( 'The discount code applied to the invoice.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'readonly'    => true,
+                ),
+
+                'tax'	  		  => array(
+                    'description' => __( 'The tax applied to the invoice.', 'invoicing' ),
+                    'type'        => 'number',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'readonly'    => true,
+                ),
+
+                'fees_total'	  => array(
+                    'description' => __( 'The total fees applied to the invoice.', 'invoicing' ),
+                    'type'        => 'number',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'readonly'    => true,
+                ),
+
+                'subtotal'	  	  => array(
+                    'description' => __( 'The sub-total for the invoice.', 'invoicing' ),
+                    'type'        => 'number',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'readonly'    => true,
+                ),
+
+                'currency'	  	  => array(
+                    'description' => __( 'The currency used to process the invoice.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'cart_details'	  => array(
+                    'description' => __( 'The cart details for invoice.', 'invoicing' ),
+                    'type'        => 'array',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'required'	  => true,
+                ),
+
+                'date'         => array(
+                    'description' => __( "The date the invoice was published, in the site's timezone.", 'invoicing' ),
+                    'type'        => array( 'string', 'null' ),
+                    'format'      => 'date-time',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'due_date'     => array(
+                    'description' => __( 'The due date for the invoice.', 'invoicing' ),
+                    'type'        => array( 'string', 'null' ),
+                    'format'      => 'date-time',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'completed_date'  => array(
+                    'description' => __( 'The completed date for the invoice.', 'invoicing' ),
+                    'type'        => array( 'string', 'null' ),
+                    'format'      => 'date-time',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'readonly'    => true,
+                ),
 				
-				'link'         => array(
-					'description' => __( 'URL to the invoice.', 'invoicing' ),
-					'type'        => 'string',
-					'format'      => 'uri',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'readonly'    => true,
-				),
-
-				'mode'       	  => array(
-					'description' => __( 'The mode used to process the invoice.', 'invoicing' ),
-					'type'        => 'string',
-					'enum'        => array( 'live', 'test' ),
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'readonly'    => true,
-				),
-
-				'slug'       	  => array(
-					'description' => __( 'An alphanumeric identifier for the invoice.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'arg_options' => array(
-						'sanitize_callback' => array( $this, 'sanitize_slug' ),
-					),
-					'readonly'    => true,
-				),
-
-				'status'       	  => array(
-					'description' => __( 'A named status for the invoice.', 'invoicing' ),
-					'type'        => 'string',
-					'enum'        => $this->get_post_statuses(),
-					'context'     => array( 'view', 'edit' ),
-					'default'	  => 'wpi-pending',
-				),
-
-				'status_nicename' => array(
-					'description' => __( 'A human-readable status name for the invoice.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'embed' ),
-					'readonly'    => true,
-				),
-
-				'post_type'       => array(
-					'description' => __( 'The post type for the invoice.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view' ),
-					'readonly'    => true,
-				),
-			),
-		);
-
-		// Add helpful links to the invoice schem.
-		$schema['links'] = $this->get_schema_links();
-
-		/**
-		 * Filters the invoice schema for the REST API.
-		 *
-		 * Enables adding extra properties to invoices.
-		 *
-		 * @since 1.0.13
-		 *
-		 * @param array   $schema    The invoice schema.
-		 */
+                'link'         => array(
+                    'description' => __( 'URL to the invoice.', 'invoicing' ),
+                    'type'        => 'string',
+                    'format'      => 'uri',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'readonly'    => true,
+                ),
+
+                'mode'       	  => array(
+                    'description' => __( 'The mode used to process the invoice.', 'invoicing' ),
+                    'type'        => 'string',
+                    'enum'        => array( 'live', 'test' ),
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'readonly'    => true,
+                ),
+
+                'slug'       	  => array(
+                    'description' => __( 'An alphanumeric identifier for the invoice.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'arg_options' => array(
+                        'sanitize_callback' => array( $this, 'sanitize_slug' ),
+                    ),
+                    'readonly'    => true,
+                ),
+
+                'status'       	  => array(
+                    'description' => __( 'A named status for the invoice.', 'invoicing' ),
+                    'type'        => 'string',
+                    'enum'        => $this->get_post_statuses(),
+                    'context'     => array( 'view', 'edit' ),
+                    'default'	  => 'wpi-pending',
+                ),
+
+                'status_nicename' => array(
+                    'description' => __( 'A human-readable status name for the invoice.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'embed' ),
+                    'readonly'    => true,
+                ),
+
+                'post_type'       => array(
+                    'description' => __( 'The post type for the invoice.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view' ),
+                    'readonly'    => true,
+                ),
+            ),
+        );
+
+        // Add helpful links to the invoice schem.
+        $schema['links'] = $this->get_schema_links();
+
+        /**
+         * Filters the invoice schema for the REST API.
+         *
+         * Enables adding extra properties to invoices.
+         *
+         * @since 1.0.13
+         *
+         * @param array   $schema    The invoice schema.
+         */
         $schema = apply_filters( "wpinv_rest_invoice_schema", $schema );
 
-		// Cache the invoice schema.
-		$this->schema = $schema;
+        // Cache the invoice schema.
+        $this->schema = $schema;
 		
-		return $this->add_additional_fields_schema( $this->schema );
-	}
-
-	/**
-	 * Retrieve Link Description Objects that should be added to the Schema for the invoices collection.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @return array
-	 */
-	protected function get_schema_links() {
-
-		$href = rest_url( "{$this->namespace}/{$this->rest_base}/{id}" );
-
-		$links = array();
-
-		$links[] = array(
-			'rel'          => 'https://api.w.org/action-publish',
-			'title'        => __( 'The current user can mark this invoice as completed.', 'invoicing' ),
-			'href'         => $href,
-			'targetSchema' => array(
-				'type'       => 'object',
-				'properties' => array(
-					'status' => array(
-						'type' => 'string',
-						'enum' => array( 'publish', 'wpi-renewal' ),
-					),
-				),
-			),
-		);
-
-		$links[] = array(
-			'rel'          => 'https://api.w.org/action-assign-author',
-			'title'        => __( 'The current user can change the owner of this invoice.', 'invoicing' ),
-			'href'         => $href,
-			'targetSchema' => array(
-				'type'       => 'object',
-				'properties'   => array(
-					'user_id'  => array(
-						'type' => 'integer',
-					),
-				),
-			),
-		);
-
-		return $links;
-	}
-
-	/**
-	 * Prepares links for the request.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WPInv_Invoice $invoice Invoice Object.
-	 * @return array Links for the given invoice.
-	 */
-	protected function prepare_links( $invoice ) {
-
-		// Prepare the base REST API endpoint for invoices.
-		$base = sprintf( '%s/%s', $this->namespace, $this->rest_base );
-
-		// Entity meta.
-		$links = array(
-			'self'       => array(
-				'href' => rest_url( trailingslashit( $base ) . $invoice->ID ),
-			),
-			'collection' => array(
-				'href' => rest_url( $base ),
-			),
-		);
-
-		if ( ! empty( $invoice->user_id ) ) {
-			$links['user'] = array(
-				'href'       => rest_url( 'wp/v2/users/' . $invoice->user_id ),
-				'embeddable' => true,
-			);
-		}
-
-		/**
-		 * Filters the returned invoice links for the REST API.
-		 *
-		 * Enables adding extra links to invoice API responses.
-		 *
-		 * @since 1.0.13
-		 *
-		 * @param array   $links    Rest links.
-		 */
-		return apply_filters( "wpinv_rest_invoice_links", $links );
-
-	}
-
-	/**
-	 * Get the link relations available for the post and current user.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WPInv_Invoice   $invoice    Invoice object.
-	 * @param WP_REST_Request $request Request object.
-	 * @return array List of link relations.
-	 */
-	protected function get_available_actions( $invoice, $request ) {
-
-		if ( 'edit' !== $request['context'] ) {
-			return array();
-		}
-
-		$rels = array();
-
-		// Retrieve the post type object.
-		$post_type = get_post_type_object( $invoice->post_type );
-
-		// Mark invoice as completed.
-		if ( current_user_can( $post_type->cap->publish_posts ) ) {
-			$rels[] = 'https://api.w.org/action-publish';
-		}
-
-		// Change the owner of the invoice.
-		if ( current_user_can( $post_type->cap->edit_others_posts ) ) {
-			$rels[] = 'https://api.w.org/action-assign-author';
-		}
-
-		/**
-		 * Filters the available invoice link relations for the REST API.
-		 *
-		 * Enables adding extra link relation for the current user and request to invoice responses.
-		 *
-		 * @since 1.0.13
-		 *
-		 * @param array   $rels    Available link relations.
-		 */
-		return apply_filters( "wpinv_rest_invoice_link_relations", $rels );
-	}
-
-	/**
-	 * Sanitizes and validates the list of post statuses.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param string|array    $statuses  One or more post statuses.
-	 * @param WP_REST_Request $request   Full details about the request.
-	 * @param string          $parameter Additional parameter to pass to validation.
-	 * @return array|WP_Error A list of valid statuses, otherwise WP_Error object.
-	 */
-	public function sanitize_post_statuses( $statuses, $request, $parameter ) {
-		return array_intersect( wp_parse_slug_list( $statuses ), $this->get_post_statuses() );
-	}
-
-	/**
-	 * Retrieves a valid list of post statuses.
-	 *
-	 * @since 1.0.15
-	 *
-	 * @return array A list of registered item statuses.
-	 */
-	public function get_post_statuses() {
-		return array_keys( wpinv_get_invoice_statuses( true, true ) );
-	}
+        return $this->add_additional_fields_schema( $this->schema );
+    }
+
+    /**
+     * Retrieve Link Description Objects that should be added to the Schema for the invoices collection.
+     *
+     * @since 1.0.13
+     *
+     * @return array
+     */
+    protected function get_schema_links() {
+
+        $href = rest_url( "{$this->namespace}/{$this->rest_base}/{id}" );
+
+        $links = array();
+
+        $links[] = array(
+            'rel'          => 'https://api.w.org/action-publish',
+            'title'        => __( 'The current user can mark this invoice as completed.', 'invoicing' ),
+            'href'         => $href,
+            'targetSchema' => array(
+                'type'       => 'object',
+                'properties' => array(
+                    'status' => array(
+                        'type' => 'string',
+                        'enum' => array( 'publish', 'wpi-renewal' ),
+                    ),
+                ),
+            ),
+        );
+
+        $links[] = array(
+            'rel'          => 'https://api.w.org/action-assign-author',
+            'title'        => __( 'The current user can change the owner of this invoice.', 'invoicing' ),
+            'href'         => $href,
+            'targetSchema' => array(
+                'type'       => 'object',
+                'properties'   => array(
+                    'user_id'  => array(
+                        'type' => 'integer',
+                    ),
+                ),
+            ),
+        );
+
+        return $links;
+    }
+
+    /**
+     * Prepares links for the request.
+     *
+     * @since 1.0.13
+     *
+     * @param WPInv_Invoice $invoice Invoice Object.
+     * @return array Links for the given invoice.
+     */
+    protected function prepare_links( $invoice ) {
+
+        // Prepare the base REST API endpoint for invoices.
+        $base = sprintf( '%s/%s', $this->namespace, $this->rest_base );
+
+        // Entity meta.
+        $links = array(
+            'self'       => array(
+                'href' => rest_url( trailingslashit( $base ) . $invoice->ID ),
+            ),
+            'collection' => array(
+                'href' => rest_url( $base ),
+            ),
+        );
+
+        if ( ! empty( $invoice->user_id ) ) {
+            $links['user'] = array(
+                'href'       => rest_url( 'wp/v2/users/' . $invoice->user_id ),
+                'embeddable' => true,
+            );
+        }
+
+        /**
+         * Filters the returned invoice links for the REST API.
+         *
+         * Enables adding extra links to invoice API responses.
+         *
+         * @since 1.0.13
+         *
+         * @param array   $links    Rest links.
+         */
+        return apply_filters( "wpinv_rest_invoice_links", $links );
+
+    }
+
+    /**
+     * Get the link relations available for the post and current user.
+     *
+     * @since 1.0.13
+     *
+     * @param WPInv_Invoice   $invoice    Invoice object.
+     * @param WP_REST_Request $request Request object.
+     * @return array List of link relations.
+     */
+    protected function get_available_actions( $invoice, $request ) {
+
+        if ( 'edit' !== $request['context'] ) {
+            return array();
+        }
+
+        $rels = array();
+
+        // Retrieve the post type object.
+        $post_type = get_post_type_object( $invoice->post_type );
+
+        // Mark invoice as completed.
+        if ( current_user_can( $post_type->cap->publish_posts ) ) {
+            $rels[] = 'https://api.w.org/action-publish';
+        }
+
+        // Change the owner of the invoice.
+        if ( current_user_can( $post_type->cap->edit_others_posts ) ) {
+            $rels[] = 'https://api.w.org/action-assign-author';
+        }
+
+        /**
+         * Filters the available invoice link relations for the REST API.
+         *
+         * Enables adding extra link relation for the current user and request to invoice responses.
+         *
+         * @since 1.0.13
+         *
+         * @param array   $rels    Available link relations.
+         */
+        return apply_filters( "wpinv_rest_invoice_link_relations", $rels );
+    }
+
+    /**
+     * Sanitizes and validates the list of post statuses.
+     *
+     * @since 1.0.13
+     *
+     * @param string|array    $statuses  One or more post statuses.
+     * @param WP_REST_Request $request   Full details about the request.
+     * @param string          $parameter Additional parameter to pass to validation.
+     * @return array|WP_Error A list of valid statuses, otherwise WP_Error object.
+     */
+    public function sanitize_post_statuses( $statuses, $request, $parameter ) {
+        return array_intersect( wp_parse_slug_list( $statuses ), $this->get_post_statuses() );
+    }
+
+    /**
+     * Retrieves a valid list of post statuses.
+     *
+     * @since 1.0.15
+     *
+     * @return array A list of registered item statuses.
+     */
+    public function get_post_statuses() {
+        return array_keys( wpinv_get_invoice_statuses( true, true ) );
+    }
     
 }
\ No newline at end of file

Spacing +325 added lines, -325 removed lines

@@ -8,7 +8,7 @@ 
  * @since    1.0.13
  */
 
-if ( !defined( 'WPINC' ) ) {
+if (!defined('WPINC')) {
     exit;
 }
 
@@ -41,7 +41,7 @@ 
 	 *
 	 * @param string $namespace Api Namespace
 	 */
-	public function __construct( $namespace ) {
+	public function __construct($namespace) {
         
         // Set api namespace...
 		$this->namespace = $namespace;
@@ -60,16 +60,16 @@ 
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return true|WP_Error True if the request has read access, WP_Error object otherwise.
 	 */
-	public function get_items_permissions_check( $request ) {
+	public function get_items_permissions_check($request) {
 	
-        $post_type = get_post_type_object( $this->post_type );
+        $post_type = get_post_type_object($this->post_type);
 
-		if ( 'edit' === $request['context'] && ! current_user_can( $post_type->cap->edit_posts ) ) {
-			return new WP_Error( 'rest_forbidden_context', __( 'Sorry, you are not allowed to edit items.', 'invoicing' ), array( 'status' => rest_authorization_required_code() ) );
+		if ('edit' === $request['context'] && !current_user_can($post_type->cap->edit_posts)) {
+			return new WP_Error('rest_forbidden_context', __('Sorry, you are not allowed to edit items.', 'invoicing'), array('status' => rest_authorization_required_code()));
 		}
 
-		if ( ! is_user_logged_in() ) {
-			return new WP_Error( 'rest_forbidden', __( 'Sorry, you must be logged in to view items.', 'invoicing' ), array( 'status' => rest_authorization_required_code() ) );
+		if (!is_user_logged_in()) {
+			return new WP_Error('rest_forbidden', __('Sorry, you must be logged in to view items.', 'invoicing'), array('status' => rest_authorization_required_code()));
 		}
 
 		// Read checks will be evaluated on a per invoice basis
@@ -86,33 +86,33 @@ 
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 	 */
-	public function get_items( $request ) {
+	public function get_items($request) {
 		
 		// Retrieve request query parameters.
-		$args          = $this->get_request_collection_params( $request );
+		$args          = $this->get_request_collection_params($request);
 		
 		// WP_Query Args.
-		$wp_query_args = $this->get_collection_wp_query_params( $args, $request );
+		$wp_query_args = $this->get_collection_wp_query_params($args, $request);
 		
 		// Get invoice ids...
-		$query         = new WP_Query( $wp_query_args );
+		$query         = new WP_Query($wp_query_args);
 
 		// ... and map them into invoice objects.
-		$_invoices     = array_map( array( $this, 'get_post' ), $query->posts );
+		$_invoices     = array_map(array($this, 'get_post'), $query->posts);
 
 		// Prepare the retrieved invoices
 		$invoices      = array();
 
-		foreach( $_invoices as $invoice ) {
-			if ( $this->check_read_permission( $invoice ) ) {
-				$invoices[] = $this->prepare_response_for_collection( $this->prepare_item_for_response( $invoice, $request ) );
+		foreach ($_invoices as $invoice) {
+			if ($this->check_read_permission($invoice)) {
+				$invoices[] = $this->prepare_response_for_collection($this->prepare_item_for_response($invoice, $request));
 			}
 		}
 
 		// Prepare the response.
-		$response = rest_ensure_response( $invoices );
-		$response->header( 'X-WP-Total', (int) $query->found_posts );
-		$response->header( 'X-WP-TotalPages', (int) $query->max_num_pages );
+		$response = rest_ensure_response($invoices);
+		$response->header('X-WP-Total', (int) $query->found_posts);
+		$response->header('X-WP-TotalPages', (int) $query->max_num_pages);
 
 		/**
 		 * Filters the responses for invoices requests.
@@ -125,9 +125,9 @@ 
 		 * @param WP_REST_Request     $request The request used.
          * @param array               $args Array of args used to retrieve the invoices
 		 */
-        $response       = apply_filters( "wpinv_rest_invoices_response", $response, $request, $args );
+        $response = apply_filters("wpinv_rest_invoices_response", $response, $request, $args);
 
-        return rest_ensure_response( $response );
+        return rest_ensure_response($response);
         
     }
 
@@ -139,17 +139,17 @@ 
 	 * @param int $invoice_id Supplied ID.
 	 * @return WPInv_Invoice|WP_Error Invoice object if ID is valid, WP_Error otherwise.
 	 */
-	protected function get_post( $invoice_id ) {
+	protected function get_post($invoice_id) {
 		
-		$error     = new WP_Error( 'rest_invoice_invalid_id', __( 'Invalid item ID.', 'invoicing' ), array( 'status' => 404 ) );
+		$error = new WP_Error('rest_invoice_invalid_id', __('Invalid item ID.', 'invoicing'), array('status' => 404));
 
         // Ids start from 1
-        if ( (int) $invoice_id <= 0 ) {
+        if ((int) $invoice_id <= 0) {
 			return $error;
 		}
 
-		$invoice = wpinv_get_invoice( (int) $invoice_id );
-		if ( empty( $invoice ) || $this->post_type !== $invoice->post_type ) {
+		$invoice = wpinv_get_invoice((int) $invoice_id);
+		if (empty($invoice) || $this->post_type !== $invoice->post_type) {
 			return $error;
         }
 
@@ -165,18 +165,18 @@ 
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return bool|WP_Error True if the request has read access for the invoice, WP_Error object otherwise.
 	 */
-	public function get_item_permissions_check( $request ) {
+	public function get_item_permissions_check($request) {
 
         // Retrieve the invoice object.
-        $invoice = $this->get_post( $request['id'] );
+        $invoice = $this->get_post($request['id']);
         
         // Ensure it is valid.
-		if ( is_wp_error( $invoice ) ) {
+		if (is_wp_error($invoice)) {
 			return $invoice;
 		}
 
-		if ( $invoice ) {
-			return $this->check_read_permission( $invoice );
+		if ($invoice) {
+			return $this->check_read_permission($invoice);
 		}
 
 		return true;
@@ -193,8 +193,8 @@ 
 	 * @param WPInv_Invoice $invoice WPInv_Invoice object.
 	 * @return bool Whether the post can be read.
 	 */
-	public function check_read_permission( $invoice ) {
-		return wpinv_user_can_view_invoice( $invoice->ID );
+	public function check_read_permission($invoice) {
+		return wpinv_user_can_view_invoice($invoice->ID);
     }
     
     /**
@@ -205,19 +205,19 @@ 
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 	 */
-	public function get_item( $request ) {
+	public function get_item($request) {
 
         // Fetch the invoice.
-        $invoice = $this->get_post( $request['id'] );
+        $invoice = $this->get_post($request['id']);
         
         // Abort early if it does not exist
-		if ( is_wp_error( $invoice ) ) {
+		if (is_wp_error($invoice)) {
 			return $invoice;
 		}
 
 		// Prepare the response
-		$response = $this->prepare_item_for_response( $invoice, $request );
-		$response->link_header( 'alternate', esc_url( $invoice->get_view_url() ), array( 'type' => 'text/html' ) );
+		$response = $this->prepare_item_for_response($invoice, $request);
+		$response->link_header('alternate', esc_url($invoice->get_view_url()), array('type' => 'text/html'));
 
 		/**
 		 * Filters the responses for single invoice requests.
@@ -229,9 +229,9 @@ 
 		 * @param WP_HTTP_Response $response Response.
 		 * @param WP_REST_Request  $request The request used.
 		 */
-        $response       = apply_filters( "wpinv_rest_get_invoice_response", $response, $request );
+        $response = apply_filters("wpinv_rest_get_invoice_response", $response, $request);
 
-        return rest_ensure_response( $response );
+        return rest_ensure_response($response);
 
     }
     
@@ -243,18 +243,18 @@ 
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return true|WP_Error True if the request has access to create items, WP_Error object otherwise.
 	 */
-	public function create_item_permissions_check( $request ) {
+	public function create_item_permissions_check($request) {
 	
-		if ( ! empty( $request['id'] ) ) {
-			return new WP_Error( 'rest_invoice_exists', __( 'Cannot create existing item.', 'invoicing' ), array( 'status' => 400 ) );
+		if (!empty($request['id'])) {
+			return new WP_Error('rest_invoice_exists', __('Cannot create existing item.', 'invoicing'), array('status' => 400));
 		}
 
-		$post_type = get_post_type_object( $this->post_type );
+		$post_type = get_post_type_object($this->post_type);
 
-		if ( ! current_user_can( $post_type->cap->create_posts ) && ! wpinv_current_user_can_manage_invoicing() ) {
+		if (!current_user_can($post_type->cap->create_posts) && !wpinv_current_user_can_manage_invoicing()) {
 			return new WP_Error( 
                 'rest_cannot_create',
-                __( 'Sorry, you are not allowed to create items as this user.', 'invoicing' ), 
+                __('Sorry, you are not allowed to create items as this user.', 'invoicing'), 
                 array( 
                     'status' => rest_authorization_required_code(),
                 )
@@ -272,32 +272,32 @@ 
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 	 */
-	public function create_item( $request ) {
+	public function create_item($request) {
 
-		if ( ! empty( $request['id'] ) ) {
-			return new WP_Error( 'rest_invoice_exists', __( 'Cannot create existing item.', 'invoicing' ), array( 'status' => 400 ) );
+		if (!empty($request['id'])) {
+			return new WP_Error('rest_invoice_exists', __('Cannot create existing item.', 'invoicing'), array('status' => 400));
 		}
 
-		$request->set_param( 'context', 'edit' );
+		$request->set_param('context', 'edit');
 
 		// Prepare the updated data.
-		$invoice_data = $this->prepare_item_for_database( $request );
+		$invoice_data = $this->prepare_item_for_database($request);
 
-		if ( is_wp_error( $invoice_data ) ) {
+		if (is_wp_error($invoice_data)) {
 			return $invoice_data;
 		}
 
 		// Try creating the invoice
 		$invoice_data['post_type']    = $this->post_type;
-		$invoice_data['private_note'] = __( 'Created via API.', 'invoicing' );
-        $invoice = wpinv_insert_invoice( $invoice_data, true );
+		$invoice_data['private_note'] = __('Created via API.', 'invoicing');
+        $invoice = wpinv_insert_invoice($invoice_data, true);
 
-		if ( is_wp_error( $invoice ) ) {
+		if (is_wp_error($invoice)) {
             return $invoice;
 		}
 
 		// Prepare the response
-		$response = $this->prepare_item_for_response( $invoice, $request );
+		$response = $this->prepare_item_for_response($invoice, $request);
 
 		/**
 		 * Fires after a single invoice is created or updated via the REST API.
@@ -308,7 +308,7 @@ 
 		 * @param WP_REST_Request $request  Request object.
 		 * @param bool            $creating True when creating a post, false when updating.
 		 */
-		do_action( "wpinv_rest_insert_invoice", $invoice, $request, true );
+		do_action("wpinv_rest_insert_invoice", $invoice, $request, true);
 
 		/**
 		 * Filters the responses for creating single invoice requests.
@@ -320,9 +320,9 @@ 
 		 * @param array           $invoice_data Invoice properties.
 		 * @param WP_REST_Request $request The request used.
 		 */
-        $response       = apply_filters( "wpinv_rest_create_invoice_response", $response, $request );
+        $response = apply_filters("wpinv_rest_create_invoice_response", $response, $request);
 
-        return rest_ensure_response( $response );
+        return rest_ensure_response($response);
 	}
 
 	/**
@@ -333,20 +333,20 @@ 
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return true|WP_Error True if the request has access to update the item, WP_Error object otherwise.
 	 */
-	public function update_item_permissions_check( $request ) {
+	public function update_item_permissions_check($request) {
 
 		// Retrieve the invoice.
-		$invoice = $this->get_post( $request['id'] );
-		if ( is_wp_error( $invoice ) ) {
+		$invoice = $this->get_post($request['id']);
+		if (is_wp_error($invoice)) {
 			return $invoice;
 		}
 
-		$post_type = get_post_type_object( $this->post_type );
+		$post_type = get_post_type_object($this->post_type);
 
-		if ( ! current_user_can(  $post_type->cap->edit_post, $invoice->ID  ) ) {
+		if (!current_user_can($post_type->cap->edit_post, $invoice->ID)) {
 			return new WP_Error( 
                 'rest_cannot_edit', 
-                __( 'Sorry, you are not allowed to update this item.', 'invoicing' ), 
+                __('Sorry, you are not allowed to update this item.', 'invoicing'), 
                 array( 
                     'status' => rest_authorization_required_code(),
                 )
@@ -364,46 +364,46 @@ 
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 	 */
-	public function update_item( $request ) {
+	public function update_item($request) {
 		
 		// Ensure the invoice exists.
-        $valid_check = $this->get_post( $request['id'] );
+        $valid_check = $this->get_post($request['id']);
         
         // Abort early if it does not exist
-		if ( is_wp_error( $valid_check ) ) {
+		if (is_wp_error($valid_check)) {
 			return $valid_check;
 		}
 
-		$request->set_param( 'context', 'edit' );
+		$request->set_param('context', 'edit');
 
 		// Prepare the updated data.
-		$data_to_update = $this->prepare_item_for_database( $request );
+		$data_to_update = $this->prepare_item_for_database($request);
 
-		if ( is_wp_error( $data_to_update ) ) {
+		if (is_wp_error($data_to_update)) {
 			return $data_to_update;
 		}
 
 		// Abort if no invoice data is provided
-        if( empty( $data_to_update ) ) {
-            return new WP_Error( 'missing_data', __( 'An update request cannot be empty.', 'invoicing' ) );
+        if (empty($data_to_update)) {
+            return new WP_Error('missing_data', __('An update request cannot be empty.', 'invoicing'));
         }
 
 		// Include the invoice ID
 		$data_to_update['ID'] = $request['id'];
 
 		// Update the invoice
-		$updated_invoice = wpinv_update_invoice( $data_to_update, true );
+		$updated_invoice = wpinv_update_invoice($data_to_update, true);
 
 		// Incase the update operation failed...
-		if ( is_wp_error( $updated_invoice ) ) {
+		if (is_wp_error($updated_invoice)) {
 			return $updated_invoice;
 		}
 
 		// Prepare the response
-		$response = $this->prepare_item_for_response( $updated_invoice, $request );
+		$response = $this->prepare_item_for_response($updated_invoice, $request);
 
 		/** This action is documented in includes/class-wpinv-rest-invoice-controller.php */
-		do_action( "wpinv_rest_insert_invoice", $updated_invoice, $request, false );
+		do_action("wpinv_rest_insert_invoice", $updated_invoice, $request, false);
 
 		/**
 		 * Filters the responses for updating single invoice requests.
@@ -415,9 +415,9 @@ 
 		 * @param array           $invoice_data Invoice properties.
 		 * @param WP_REST_Request $request The request used.
 		 */
-        $response       = apply_filters( "wpinv_rest_update_invoice_response", $response, $request );
+        $response = apply_filters("wpinv_rest_update_invoice_response", $response, $request);
 
-        return rest_ensure_response( $response );
+        return rest_ensure_response($response);
 	}
 
 	/**
@@ -428,22 +428,22 @@ 
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return true|WP_Error True if the request has access to delete the invoice, WP_Error object otherwise.
 	 */
-	public function delete_item_permissions_check( $request ) {
+	public function delete_item_permissions_check($request) {
 
 		// Retrieve the invoice.
-		$invoice = $this->get_post( $request['id'] );
-		if ( is_wp_error( $invoice ) ) {
+		$invoice = $this->get_post($request['id']);
+		if (is_wp_error($invoice)) {
 			return $invoice;
 		}
 
 		// Ensure the current user can delete invoices
-		if ( wpinv_current_user_can_manage_invoicing() ||  current_user_can( 'delete_invoices', $request['id'] ) ) {
+		if (wpinv_current_user_can_manage_invoicing() || current_user_can('delete_invoices', $request['id'])) {
 			return true;
 		}
 
 		return new WP_Error( 
 			'rest_cannot_delete', 
-			__( 'Sorry, you are not allowed to delete this item.', 'invoicing' ), 
+			__('Sorry, you are not allowed to delete this item.', 'invoicing'), 
 			array( 
 				'status' => rest_authorization_required_code(),
 			)
@@ -458,31 +458,31 @@ 
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 	 */
-	public function delete_item( $request ) {
+	public function delete_item($request) {
 		
 		// Retrieve the invoice.
-		$invoice = $this->get_post( $request['id'] );
-		if ( is_wp_error( $invoice ) ) {
+		$invoice = $this->get_post($request['id']);
+		if (is_wp_error($invoice)) {
 			return $invoice;
 		}
 
-		$request->set_param( 'context', 'edit' );
+		$request->set_param('context', 'edit');
 
 		// Prepare the invoice id
-		$id    = $invoice->ID;
+		$id = $invoice->ID;
 
 		// Prepare the response
-		$response = $this->prepare_item_for_response( $invoice, $request );
+		$response = $this->prepare_item_for_response($invoice, $request);
 
 		// Check if the user wants to bypass the trash...
 		$force_delete = (bool) $request['force'];
 
 		// Try deleting the invoice.
-		$deleted = wp_delete_post( $id, $force_delete );
+		$deleted = wp_delete_post($id, $force_delete);
 
 		// Abort early if we can't delete the invoice.
-		if ( ! $deleted ) {
-			return new WP_Error( 'rest_cannot_delete', __( 'The item cannot be deleted.', 'invoicing' ), array( 'status' => 500 ) );
+		if (!$deleted) {
+			return new WP_Error('rest_cannot_delete', __('The item cannot be deleted.', 'invoicing'), array('status' => 500));
 		}
 
 		/**
@@ -494,7 +494,7 @@ 
 		 * @param WPInv_Invoice    $invoice  The deleted or trashed invoice.
 		 * @param WP_REST_Request  $request  The request sent to the API.
 		 */
-		do_action( "wpinv_rest_delete_invoice", $invoice, $request );
+		do_action("wpinv_rest_delete_invoice", $invoice, $request);
 
 		return $response;
 
@@ -510,29 +510,29 @@ 
 	 */
 	public function get_collection_params() {
         
-        $query_params               = array(
+        $query_params = array(
 
             // item status.
             'status'                => array(
                 'default'           => $this->get_post_statuses(),
-                'description'       => __( 'Limit result set to items assigned one or more statuses.', 'invoicing' ),
+                'description'       => __('Limit result set to items assigned one or more statuses.', 'invoicing'),
                 'type'              => 'array',
                 'items'             => array(
                     'enum'          => $this->get_post_statuses(),
                     'type'          => 'string',
                 ),
-                'sanitize_callback' => array( $this, 'sanitize_post_statuses' ),
+                'sanitize_callback' => array($this, 'sanitize_post_statuses'),
             ),
 
             // User.
             'user'                  => array(
-				'description'       => __( 'Limit result set to items for a specif user. Accepts a user ID, or comma-separated list of IDs', 'invoicing' ),
+				'description'       => __('Limit result set to items for a specif user. Accepts a user ID, or comma-separated list of IDs', 'invoicing'),
 				'type'              => 'string',
 			),
 
 			// Exclude certain users
             'exclude_users'  	    => array(
-                'description' 		=> __( 'Exclude items from specific users.', 'invoicing' ),
+                'description' 		=> __('Exclude items from specific users.', 'invoicing'),
                 'type'        		=> 'array',
                 'items'       		=> array(
                     'type' => 'integer',
@@ -542,62 +542,62 @@ 
 			
 			// Items before.
             'before_date'           => array(
-				'description'       => __( 'Limit result set to items created before a specific date. Accepts strtotime()-compatible string.', 'invoicing' ),
+				'description'       => __('Limit result set to items created before a specific date. Accepts strtotime()-compatible string.', 'invoicing'),
 				'type'              => 'string',
 			),
 
             'meta_key'           => array(
-				'description'       => __( 'Filter items by custom field key.', 'invoicing' ),
+				'description'       => __('Filter items by custom field key.', 'invoicing'),
 				'type'              => 'string',
 			),
 
             'meta_compare_key'           => array(
-				'description'       => __( 'Comparison operator to test the `meta_key`.', 'invoicing' ),
+				'description'       => __('Comparison operator to test the `meta_key`.', 'invoicing'),
 				'type'              => 'string',
 				'default'              => '=',
-				'enum'        		=> array_map( 'trim', explode( ',', '=, !=, >, >=, <, <=, LIKE NOT, LIKE, IN, NOT IN, BETWEEN, NOT BETWEEN, NOT EXISTS, REGEXP, NOT REGEXP, RLIKE' ) ),
+				'enum'        		=> array_map('trim', explode(',', '=, !=, >, >=, <, <=, LIKE NOT, LIKE, IN, NOT IN, BETWEEN, NOT BETWEEN, NOT EXISTS, REGEXP, NOT REGEXP, RLIKE')),
 			),
 
             'meta_value'           => array(
-				'description'       => __( 'Filter items by custom field value.', 'invoicing' ),
+				'description'       => __('Filter items by custom field value.', 'invoicing'),
 				'type'              => 'string',
 			),
 
             'meta_compare'           => array(
-				'description'       => __( 'Comparison operator to test the `meta_value`.', 'invoicing' ),
+				'description'       => __('Comparison operator to test the `meta_value`.', 'invoicing'),
 				'type'              => 'string',
 				'default'              => '=',
-				'enum'        		=> array_map( 'trim', explode( ',', '=, !=, >, >=, <, <=, LIKE NOT, LIKE, IN, NOT IN, BETWEEN, NOT BETWEEN, NOT EXISTS, REGEXP, NOT REGEXP, RLIKE' ) ),
+				'enum'        		=> array_map('trim', explode(',', '=, !=, >, >=, <, <=, LIKE NOT, LIKE, IN, NOT IN, BETWEEN, NOT BETWEEN, NOT EXISTS, REGEXP, NOT REGEXP, RLIKE')),
 			),
 
 			'meta_value_num'           => array(
-				'description'       => __( 'Filter items by a numeric custom field value.', 'invoicing' ),
+				'description'       => __('Filter items by a numeric custom field value.', 'invoicing'),
 				'type'              => 'integer',
 			),
 
 			// items after.
             'after_date'            => array(
-				'description'       => __( 'Limit result set to items created after a specific date. Accepts strtotime()-compatible string.', 'invoicing' ),
+				'description'       => __('Limit result set to items created after a specific date. Accepts strtotime()-compatible string.', 'invoicing'),
 				'type'              => 'string',
             ),
             
             // Number of results per page
             'limit'                 => array(
-				'description'       => __( 'Number of items to fetch.', 'invoicing' ),
+				'description'       => __('Number of items to fetch.', 'invoicing'),
 				'type'              => 'integer',
-				'default'           => (int) get_option( 'posts_per_page' ),
+				'default'           => (int) get_option('posts_per_page'),
             ),
 
             // Pagination
             'page'     => array(
-				'description'       => __( 'Current page to fetch.', 'invoicing' ),
+				'description'       => __('Current page to fetch.', 'invoicing'),
 				'type'              => 'integer',
 				'default'           => 1,
             ),
 
             // limit to certain items
             'include'  => array(
-                'description' => __( 'Limit result set to specific IDs.', 'invoicing' ),
+                'description' => __('Limit result set to specific IDs.', 'invoicing'),
                 'type'        => 'array',
                 'items'       => array(
                     'type' => 'integer',
@@ -607,7 +607,7 @@ 
 			
 			// Exclude certain items
             'exclude'  => array(
-                'description' => __( 'Ensure result set excludes specific IDs.', 'invoicing' ),
+                'description' => __('Ensure result set excludes specific IDs.', 'invoicing'),
                 'type'        => 'array',
                 'items'       => array(
                     'type' => 'integer',
@@ -617,7 +617,7 @@ 
 
             // Order items by
             'orderby'  		  => array(
-                'description' => __( 'Sort retrieved items by parameter.', 'invoicing' ),
+                'description' => __('Sort retrieved items by parameter.', 'invoicing'),
                 'type'        => 'string',
                 'default'     => 'date',
                 'enum'        => array(
@@ -632,10 +632,10 @@ 
 
             // How to order
             'order'    => array(
-                'description' => __( 'Designates ascending or descending order of ítems.', 'invoicing' ),
+                'description' => __('Designates ascending or descending order of ítems.', 'invoicing'),
                 'type'        => 'string',
                 'default'     => 'DESC',
-                'enum'        => array( 'ASC', 'DESC' ),
+                'enum'        => array('ASC', 'DESC'),
             ),
         );
 
@@ -647,7 +647,7 @@ 
 		 *
 		 * @param array        $query_params JSON Schema-formatted collection parameters.
 		 */
-		return apply_filters( "wpinv_rest_invoices_collection_params", $query_params );
+		return apply_filters("wpinv_rest_invoices_collection_params", $query_params);
 	}
 	
 	/**
@@ -657,7 +657,7 @@ 
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return array Request collection parameters.
 	 */
-	public function get_request_collection_params( $request ) {
+	public function get_request_collection_params($request) {
 		
 		// Retrieve the list of registered invoice query parameters.
 		$registered = $this->get_collection_params();
@@ -674,7 +674,7 @@ 
             'meta_compare'          => '=',
 			'meta_value_num'        => null,
             'after_date'            => null,
-            'limit'                 => (int) get_option( 'posts_per_page' ),
+            'limit'                 => (int) get_option('posts_per_page'),
 			'page'     				=> 1,
 			'include'				=> array(),
             'exclude'  				=> array(),
@@ -683,9 +683,9 @@ 
 		);
 
 		// Add any params from the requests.
-		foreach ( array_keys( $registered ) as $key ) {
-            if ( isset( $request[ $key] ) ) {
-                $args[ $key ] = $request[ $key];
+		foreach (array_keys($registered) as $key) {
+            if (isset($request[$key])) {
+                $args[$key] = $request[$key];
             }
         }
 		
@@ -698,7 +698,7 @@ 
 		 * @param array           $args    Request query args.
 		 * @param WP_REST_Request $request Full details about the request.
 		 */
-		return apply_filters( "wpinv_rest_invoices_collection_request_params", $args, $request );
+		return apply_filters("wpinv_rest_invoices_collection_request_params", $args, $request);
 	}
 	
 	/**
@@ -709,7 +709,7 @@ 
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return array WP_Query parameters.
 	 */
-	public function get_collection_wp_query_params( $args, $request ) {
+	public function get_collection_wp_query_params($args, $request) {
 		
 		// Prepare the parameters.
 		$wp_query_args = array(
@@ -726,35 +726,35 @@ 
 			'meta_value_num'   => $args['meta_value_num'],
 			'post__in'         => $args['include'],
 			'post__in'         => $args['exclude'],
-			'date_query'       => array( array() ),
+			'date_query'       => array(array()),
 			'fields'           => 'ids',
 			'orderby'          => $args['orderby'],
 			'order'            => $args['order'],
 		);
 
 		// Only admins can view other user's invoices.
-		if ( ! wpinv_current_user_can_manage_invoicing() ) {
+		if (!wpinv_current_user_can_manage_invoicing()) {
 			$wp_query_args['author'] = get_current_user_id();
 		}
 
 		// No date specific params provided.
-		if ( empty( $args['before_date'] ) && empty( $args['after_date'] ) ) {
-			unset( $wp_query_args['date_query'] );
+		if (empty($args['before_date']) && empty($args['after_date'])) {
+			unset($wp_query_args['date_query']);
 		}
 
-		if ( ! empty( $args['before_date'] ) ) {
+		if (!empty($args['before_date'])) {
 			$wp_query_args['date_query'][0]['before'] = $args['before_date'];
 		}
 
-		if ( ! empty( $args['after_date'] ) ) {
+		if (!empty($args['after_date'])) {
 			$wp_query_args['date_query'][0]['after'] = $args['after_date'];
 		}
 
 		// Remove empty variables.
-		$wp_query_args = array_filter( $wp_query_args );
+		$wp_query_args = array_filter($wp_query_args);
 
 		// This can be zero.
-		if ( ! is_null( $args['meta_value_num'] ) ) {
+		if (!is_null($args['meta_value_num'])) {
 			$wp_query_args['meta_value_num'] = $args['meta_value_num'];
 		}
 		
@@ -768,7 +768,7 @@ 
 		 * @param array           $wp_query_args Generated WP_Query args args.
 		 * @param WP_REST_Request $request       Full details about the request.
 		 */
-		return apply_filters( "wpinv_rest_invoices_collection_wp_query_params", $wp_query_args, $args, $request );
+		return apply_filters("wpinv_rest_invoices_collection_wp_query_params", $wp_query_args, $args, $request);
     }
     
     /**
@@ -779,7 +779,7 @@ 
 	 * @param object|string $post_type Post type name or object.
 	 * @return bool Whether the post type is allowed in REST.
 	 */
-	protected function check_is_post_type_allowed( $post_type ) {
+	protected function check_is_post_type_allowed($post_type) {
 		return true;
 	}
 
@@ -791,49 +791,49 @@ 
 	 * @param WP_REST_Request $request Request object.
 	 * @return array|WP_Error Invoice Properties or WP_Error.
 	 */
-	protected function prepare_item_for_database( $request ) {
+	protected function prepare_item_for_database($request) {
 		$prepared_invoice = new stdClass();
 
 		// Post ID.
-		if ( isset( $request['id'] ) ) {
-			$existing_invoice = $this->get_post( $request['id'] );
-			if ( is_wp_error( $existing_invoice ) ) {
+		if (isset($request['id'])) {
+			$existing_invoice = $this->get_post($request['id']);
+			if (is_wp_error($existing_invoice)) {
 				return $existing_invoice;
 			}
 
-			$prepared_invoice->ID 		  = $existing_invoice->ID;
+			$prepared_invoice->ID = $existing_invoice->ID;
 			$prepared_invoice->invoice_id = $existing_invoice->ID;
 		}
 
 		$schema = $this->get_item_schema();
 
 		// Invoice owner.
-		if ( ! empty( $schema['properties']['user_id'] ) && isset( $request['user_id'] ) ) {
+		if (!empty($schema['properties']['user_id']) && isset($request['user_id'])) {
 			$prepared_invoice->user_id = (int) $request['user_id'];
 		}
 
 		// Cart details.
-		if ( ! empty( $schema['properties']['cart_details'] ) && isset( $request['cart_details'] ) ) {
+		if (!empty($schema['properties']['cart_details']) && isset($request['cart_details'])) {
 			$prepared_invoice->cart_details = (array) $request['cart_details'];
 		}
 
 		// Invoice status.
-		if ( ! empty( $schema['properties']['status'] ) && isset( $request['status'] ) ) {
+		if (!empty($schema['properties']['status']) && isset($request['status'])) {
 
-			if ( in_array( $request['status'], $this->get_post_statuses(), true ) ) {
+			if (in_array($request['status'], $this->get_post_statuses(), true)) {
 				$prepared_invoice->status = $request['status'];
 			}
 
 		}
 
 		// User info
-		if ( ! empty( $schema['properties']['user_info'] ) && isset( $request['user_info'] ) ) {
+		if (!empty($schema['properties']['user_info']) && isset($request['user_info'])) {
 			$prepared_invoice->user_info = array();
 			$user_info = (array) $request['user_info'];
 
-			foreach( $user_info as $prop => $value ) {
+			foreach ($user_info as $prop => $value) {
 
-				if ( ! empty( $schema['properties']['user_info']['properties'][$prop] ) ) {
+				if (!empty($schema['properties']['user_info']['properties'][$prop])) {
 
 					$prepared_invoice->user_info[$prop] = $value;
 		
@@ -844,59 +844,59 @@ 
 		}
 
 		// IP
-		if ( ! empty( $schema['properties']['ip'] ) && isset( $request['ip'] ) ) {
+		if (!empty($schema['properties']['ip']) && isset($request['ip'])) {
 			$prepared_invoice->ip = $request['ip'];
 		}
 
 		// Payment details
 		$prepared_invoice->payment_details = array();
 
-		if ( ! empty( $schema['properties']['gateway'] ) && isset( $request['gateway'] ) ) {
+		if (!empty($schema['properties']['gateway']) && isset($request['gateway'])) {
 			$prepared_invoice->payment_details['gateway'] = $request['gateway'];
 		}
 
-		if ( ! empty( $schema['properties']['gateway_title'] ) && isset( $request['gateway_title'] ) ) {
+		if (!empty($schema['properties']['gateway_title']) && isset($request['gateway_title'])) {
 			$prepared_invoice->payment_details['gateway_title'] = $request['gateway_title'];
 		}
 
-		if ( ! empty( $schema['properties']['currency'] ) && isset( $request['currency'] ) ) {
+		if (!empty($schema['properties']['currency']) && isset($request['currency'])) {
 			$prepared_invoice->payment_details['currency'] = $request['currency'];
 		}
 
-		if ( ! empty( $schema['properties']['transaction_id'] ) && isset( $request['transaction_id'] ) ) {
+		if (!empty($schema['properties']['transaction_id']) && isset($request['transaction_id'])) {
 			$prepared_invoice->payment_details['transaction_id'] = $request['transaction_id'];
 		}
 
 		// Dates
-		if ( ! empty( $schema['properties']['date'] ) && isset( $request['date'] ) ) {
-			$post_date = rest_get_date_with_gmt( $request['date'] );
+		if (!empty($schema['properties']['date']) && isset($request['date'])) {
+			$post_date = rest_get_date_with_gmt($request['date']);
 
-			if ( ! empty( $post_date ) ) {
+			if (!empty($post_date)) {
 				$prepared_invoice->post_date = $post_date[0];
 			}
 			
 		}
 
-		if ( ! empty( $schema['properties']['due_date'] ) && isset( $request['due_date'] ) ) {
-			$due_date = rest_get_date_with_gmt( $request['due_date'] );
+		if (!empty($schema['properties']['due_date']) && isset($request['due_date'])) {
+			$due_date = rest_get_date_with_gmt($request['due_date']);
 
-			if ( ! empty( $due_date ) ) {
+			if (!empty($due_date)) {
 				$prepared_invoice->due_date = $due_date[0];
 			}
 
 		}
 
-		if ( ! empty( $schema['properties']['valid_until'] ) && isset( $request['valid_until'] ) ) {
+		if (!empty($schema['properties']['valid_until']) && isset($request['valid_until'])) {
 
-			if ( ! empty( $request['valid_until'] ) ) {
-				$prepared_invoice->valid_until = gmdate( 'Y-m-d', strtotime( $request['valid_until'] ) );
+			if (!empty($request['valid_until'])) {
+				$prepared_invoice->valid_until = gmdate('Y-m-d', strtotime($request['valid_until']));
 			} else {
 				$prepared_invoice->valid_until = '';
 			}
 
 		}
 
-		$invoice_data = (array) wp_unslash( $prepared_invoice );
+		$invoice_data = (array) wp_unslash($prepared_invoice);
 
 		/**
 		 * Filters an invoice before it is inserted via the REST API.
@@ -906,7 +906,7 @@ 
 		 * @param array        $invoice_data An array of invoice data
 		 * @param WP_REST_Request $request       Request object.
 		 */
-		return apply_filters( "wpinv_rest_pre_insert_invoice", $invoice_data, $request );
+		return apply_filters("wpinv_rest_pre_insert_invoice", $invoice_data, $request);
 
 	}
 
@@ -919,20 +919,20 @@ 
 	 * @param WP_REST_Request $request Request object.
 	 * @return WP_REST_Response Response object.
 	 */
-	public function prepare_item_for_response( $invoice, $request ) {
+	public function prepare_item_for_response($invoice, $request) {
 
-		$GLOBALS['post'] = get_post( $invoice->ID );
+		$GLOBALS['post'] = get_post($invoice->ID);
 
-		setup_postdata( $invoice->ID );
+		setup_postdata($invoice->ID);
 
 		// Fetch the fields to include in this response.
-		$fields = $this->get_fields_for_response( $request );
+		$fields = $this->get_fields_for_response($request);
 
 		// Base fields for every invoice.
 		$data = array();
 
 		// Set up ID
-		if ( rest_is_field_included( 'id', $fields ) ) {
+		if (rest_is_field_included('id', $fields)) {
 			$data['id'] = $invoice->ID;
 		}
 
@@ -947,79 +947,79 @@ 
 			'status', 'status_nicename', 'post_type'
 		);
 
-		foreach( $invoice_properties as $property ) {
+		foreach ($invoice_properties as $property) {
 
-			if ( rest_is_field_included( $property, $fields ) ) {
-				$data[$property] = $invoice->get( $property );
+			if (rest_is_field_included($property, $fields)) {
+				$data[$property] = $invoice->get($property);
 			}
 
 		}
 
 		// Valid until
-		if ( rest_is_field_included( 'valid_until', $fields ) && $this->post_type === 'wpi_quote' ) {
-			$data['valid_until'] = get_post_meta( $invoice->ID, 'wpinv_quote_valid_until', true );
+		if (rest_is_field_included('valid_until', $fields) && $this->post_type === 'wpi_quote') {
+			$data['valid_until'] = get_post_meta($invoice->ID, 'wpinv_quote_valid_until', true);
 		}
 
 		// Cart details
-		if ( rest_is_field_included( 'cart_details', $fields ) ) {
-			$data['cart_details'] = $invoice->get( 'cart_details' );
+		if (rest_is_field_included('cart_details', $fields)) {
+			$data['cart_details'] = $invoice->get('cart_details');
 		}
 
 		//Dates
-		$invoice_properties = array( 'date', 'due_date', 'completed_date' );
+		$invoice_properties = array('date', 'due_date', 'completed_date');
 
-		foreach( $invoice_properties as $property ) {
+		foreach ($invoice_properties as $property) {
 
-			if ( rest_is_field_included( $property, $fields ) ) {
-				$data[$property] = $this->prepare_date_response( '0000-00-00 00:00:00', $invoice->get( $property ) );
+			if (rest_is_field_included($property, $fields)) {
+				$data[$property] = $this->prepare_date_response('0000-00-00 00:00:00', $invoice->get($property));
 			}
 
 		}
 
 		// User id
-		if ( rest_is_field_included( 'user_id', $fields ) ) {
-			$data['user_id'] = (int) $invoice->get( 'user_id' );
+		if (rest_is_field_included('user_id', $fields)) {
+			$data['user_id'] = (int) $invoice->get('user_id');
 		}
 
 		// User info
-		$user_info = array( 'first_name', 'last_name', 'company', 'vat_number', 'vat_rate', 'address', 'city', 'country', 'state', 'zip', 'phone' );
+		$user_info = array('first_name', 'last_name', 'company', 'vat_number', 'vat_rate', 'address', 'city', 'country', 'state', 'zip', 'phone');
 
-		foreach( $user_info as $property ) {
+		foreach ($user_info as $property) {
 
-			if ( rest_is_field_included( "user_info.$property", $fields ) ) {
-				$data['user_info'][$property] = $invoice->get( $property );
+			if (rest_is_field_included("user_info.$property", $fields)) {
+				$data['user_info'][$property] = $invoice->get($property);
 			}
 
 		}
 
 		// Slug
-		if ( rest_is_field_included( 'slug', $fields ) ) {
-			$data['slug'] = $invoice->get( 'post_name' );
+		if (rest_is_field_included('slug', $fields)) {
+			$data['slug'] = $invoice->get('post_name');
 		}
 
 		// View invoice link
-		if ( rest_is_field_included( 'link', $fields ) ) {
-			$data['link'] = esc_url( $invoice->get_view_url() );
+		if (rest_is_field_included('link', $fields)) {
+			$data['link'] = esc_url($invoice->get_view_url());
 		}
 
 
-		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
-		$data    = $this->add_additional_fields_to_object( $data, $request );
-		$data    = $this->filter_response_by_context( $data, $context );
+		$context = !empty($request['context']) ? $request['context'] : 'view';
+		$data    = $this->add_additional_fields_to_object($data, $request);
+		$data    = $this->filter_response_by_context($data, $context);
 
 		// Wrap the data in a response object.
-		$response = rest_ensure_response( $data );
+		$response = rest_ensure_response($data);
 
-		$links = $this->prepare_links( $invoice );
-		$response->add_links( $links );
+		$links = $this->prepare_links($invoice);
+		$response->add_links($links);
 
-		if ( ! empty( $links['self']['href'] ) ) {
-			$actions = $this->get_available_actions( $invoice, $request );
+		if (!empty($links['self']['href'])) {
+			$actions = $this->get_available_actions($invoice, $request);
 
 			$self = $links['self']['href'];
 
-			foreach ( $actions as $rel ) {
-				$response->add_link( $rel, $self );
+			foreach ($actions as $rel) {
+				$response->add_link($rel, $self);
 			}
 		}
 
@@ -1032,7 +1032,7 @@ 
 		 * @param WPInv_Invoice    $invoice  The invoice object.
 		 * @param WP_REST_Request  $request  Request object.
 		 */
-		return apply_filters( "wpinv_rest_prepare_invoice", $response, $invoice, $request );
+		return apply_filters("wpinv_rest_prepare_invoice", $response, $invoice, $request);
 	}
 
 	/**
@@ -1045,57 +1045,57 @@ 
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return array Fields to be included in the response.
 	 */
-	public function get_fields_for_response( $request ) {
+	public function get_fields_for_response($request) {
 		$schema     = $this->get_item_schema();
-		$properties = isset( $schema['properties'] ) ? $schema['properties'] : array();
+		$properties = isset($schema['properties']) ? $schema['properties'] : array();
 
 		$additional_fields = $this->get_additional_fields();
-		foreach ( $additional_fields as $field_name => $field_options ) {
+		foreach ($additional_fields as $field_name => $field_options) {
 			// For back-compat, include any field with an empty schema
 			// because it won't be present in $this->get_item_schema().
-			if ( is_null( $field_options['schema'] ) ) {
-				$properties[ $field_name ] = $field_options;
+			if (is_null($field_options['schema'])) {
+				$properties[$field_name] = $field_options;
 			}
 		}
 
 		// Exclude fields that specify a different context than the request context.
 		$context = $request['context'];
-		if ( $context ) {
-			foreach ( $properties as $name => $options ) {
-				if ( ! empty( $options['context'] ) && ! in_array( $context, $options['context'], true ) ) {
-					unset( $properties[ $name ] );
+		if ($context) {
+			foreach ($properties as $name => $options) {
+				if (!empty($options['context']) && !in_array($context, $options['context'], true)) {
+					unset($properties[$name]);
 				}
 			}
 		}
 
-		$fields = array_keys( $properties );
+		$fields = array_keys($properties);
 
-		if ( ! isset( $request['_fields'] ) ) {
+		if (!isset($request['_fields'])) {
 			return $fields;
 		}
-		$requested_fields = wpinv_parse_list( $request['_fields'] );
-		if ( 0 === count( $requested_fields ) ) {
+		$requested_fields = wpinv_parse_list($request['_fields']);
+		if (0 === count($requested_fields)) {
 			return $fields;
 		}
 		// Trim off outside whitespace from the comma delimited list.
-		$requested_fields = array_map( 'trim', $requested_fields );
+		$requested_fields = array_map('trim', $requested_fields);
 		// Always persist 'id', because it can be needed for add_additional_fields_to_object().
-		if ( in_array( 'id', $fields, true ) ) {
+		if (in_array('id', $fields, true)) {
 			$requested_fields[] = 'id';
 		}
 		// Return the list of all requested fields which appear in the schema.
 		return array_reduce(
 			$requested_fields,
-			function( $response_fields, $field ) use ( $fields ) {
-				if ( in_array( $field, $fields, true ) ) {
+			function($response_fields, $field) use ($fields) {
+				if (in_array($field, $fields, true)) {
 					$response_fields[] = $field;
 					return $response_fields;
 				}
 				// Check for nested fields if $field is not a direct match.
-				$nested_fields = explode( '.', $field );
+				$nested_fields = explode('.', $field);
 				// A nested field is included so long as its top-level property is
 				// present in the schema.
-				if ( in_array( $nested_fields[0], $fields, true ) ) {
+				if (in_array($nested_fields[0], $fields, true)) {
 					$response_fields[] = $field;
 				}
 				return $response_fields;
@@ -1114,8 +1114,8 @@ 
 	public function get_item_schema() {
 
 		// Maybe retrieve the schema from cache.
-		if ( $this->schema ) {
-			return $this->add_additional_fields_schema( $this->schema );
+		if ($this->schema) {
+			return $this->add_additional_fields_schema($this->schema);
 		}
 
 		$schema = array(
@@ -1127,266 +1127,266 @@ 
 			'properties' 		  => array(
 
 				'title'			  => array(
-					'description' => __( 'The title for the invoice.', 'invoicing' ),
+					'description' => __('The title for the invoice.', 'invoicing'),
 					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 					'readonly'    => true,
 				),
 
 				'user_id'		  => array(
-					'description' => __( 'The ID of the owner of the invoice.', 'invoicing' ),
+					'description' => __('The ID of the owner of the invoice.', 'invoicing'),
 					'type'        => 'integer',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 				),
 
 				'email'		  	  => array(
-					'description' => __( 'The email of the owner of the invoice.', 'invoicing' ),
+					'description' => __('The email of the owner of the invoice.', 'invoicing'),
 					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 					'readonly'    => true,
 				),
 
 				'ip'			  => array(
-					'description' => __( 'The IP of the owner of the invoice.', 'invoicing' ),
+					'description' => __('The IP of the owner of the invoice.', 'invoicing'),
 					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 				),
 
 				'user_info'       => array(
-					'description' => __( 'Information about the owner of the invoice.', 'invoicing' ),
+					'description' => __('Information about the owner of the invoice.', 'invoicing'),
 					'type'        => 'object',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 					'properties'  => array(
 
 						'first_name'      => array(
-							'description' => __( 'The first name of the owner of the invoice.', 'invoicing' ),
+							'description' => __('The first name of the owner of the invoice.', 'invoicing'),
 							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
+							'context'     => array('view', 'edit', 'embed'),
 						),
 
 						'last_name'       => array(
-							'description' => __( 'The last name of the owner of the invoice.', 'invoicing' ),
+							'description' => __('The last name of the owner of the invoice.', 'invoicing'),
 							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
+							'context'     => array('view', 'edit', 'embed'),
 						),
 
 						'company'         => array(
-							'description' => __( 'The company of the owner of the invoice.', 'invoicing' ),
+							'description' => __('The company of the owner of the invoice.', 'invoicing'),
 							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
+							'context'     => array('view', 'edit', 'embed'),
 						),
 
 						'vat_number'      => array(
-							'description' => __( 'The VAT number of the owner of the invoice.', 'invoicing' ),
+							'description' => __('The VAT number of the owner of the invoice.', 'invoicing'),
 							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
+							'context'     => array('view', 'edit', 'embed'),
 						),
 
 						'vat_rate'        => array(
-							'description' => __( 'The VAT rate applied on the invoice.', 'invoicing' ),
+							'description' => __('The VAT rate applied on the invoice.', 'invoicing'),
 							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
+							'context'     => array('view', 'edit', 'embed'),
 						),
 
 						'address'        => array(
-							'description' => __( 'The address of the invoice owner.', 'invoicing' ),
+							'description' => __('The address of the invoice owner.', 'invoicing'),
 							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
+							'context'     => array('view', 'edit', 'embed'),
 						),
 
 						'city'            => array(
-							'description' => __( 'The city of the invoice owner.', 'invoicing' ),
+							'description' => __('The city of the invoice owner.', 'invoicing'),
 							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
+							'context'     => array('view', 'edit', 'embed'),
 						),
 
 						'country'         => array(
-							'description' => __( 'The country of the invoice owner.', 'invoicing' ),
+							'description' => __('The country of the invoice owner.', 'invoicing'),
 							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
+							'context'     => array('view', 'edit', 'embed'),
 						),
 
 						'state'           => array(
-							'description' => __( 'The state of the invoice owner.', 'invoicing' ),
+							'description' => __('The state of the invoice owner.', 'invoicing'),
 							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
+							'context'     => array('view', 'edit', 'embed'),
 						),
 
 						'zip'             => array(
-							'description' => __( 'The zip code of the invoice owner.', 'invoicing' ),
+							'description' => __('The zip code of the invoice owner.', 'invoicing'),
 							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
+							'context'     => array('view', 'edit', 'embed'),
 						),
 
 						'phone'             => array(
-							'description' => __( 'The phone number of the invoice owner.', 'invoicing' ),
+							'description' => __('The phone number of the invoice owner.', 'invoicing'),
 							'type'        => 'string',
-							'context'     => array( 'view', 'edit', 'embed' ),
+							'context'     => array('view', 'edit', 'embed'),
 						),
 					),
 				),
 
 				'id'           => array(
-					'description' => __( 'Unique identifier for the invoice.', 'invoicing' ),
+					'description' => __('Unique identifier for the invoice.', 'invoicing'),
 					'type'        => 'integer',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 					'readonly'    => true,
 				),
 
 				'key'			  => array(
-					'description' => __( 'A unique key for the invoice.', 'invoicing' ),
+					'description' => __('A unique key for the invoice.', 'invoicing'),
 					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 					'readonly'    => true,
 				),
 
 				'number'		  => array(
-					'description' => __( 'The invoice number.', 'invoicing' ),
+					'description' => __('The invoice number.', 'invoicing'),
 					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 					'readonly'    => true,
 				),
 
 				'transaction_id'  => array(
-					'description' => __( 'The transaction id of the invoice.', 'invoicing' ),
+					'description' => __('The transaction id of the invoice.', 'invoicing'),
 					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 				),
 
 				'gateway'		  => array(
-					'description' => __( 'The gateway used to process the invoice.', 'invoicing' ),
+					'description' => __('The gateway used to process the invoice.', 'invoicing'),
 					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 				),
 
 				'gateway_title'	  => array(
-					'description' => __( 'The title of the gateway used to process the invoice.', 'invoicing' ),
+					'description' => __('The title of the gateway used to process the invoice.', 'invoicing'),
 					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 				),
 
 				'total'	  		  => array(
-					'description' => __( 'The total amount of the invoice.', 'invoicing' ),
+					'description' => __('The total amount of the invoice.', 'invoicing'),
 					'type'        => 'number',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 					'readonly'    => true,
 				),
 
 				'discount'		  => array(
-					'description' => __( 'The discount applied to the invoice.', 'invoicing' ),
+					'description' => __('The discount applied to the invoice.', 'invoicing'),
 					'type'        => 'number',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 					'readonly'    => true,
 				),
 
 				'discount_code'	  => array(
-					'description' => __( 'The discount code applied to the invoice.', 'invoicing' ),
+					'description' => __('The discount code applied to the invoice.', 'invoicing'),
 					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 					'readonly'    => true,
 				),
 
 				'tax'	  		  => array(
-					'description' => __( 'The tax applied to the invoice.', 'invoicing' ),
+					'description' => __('The tax applied to the invoice.', 'invoicing'),
 					'type'        => 'number',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 					'readonly'    => true,
 				),
 
 				'fees_total'	  => array(
-					'description' => __( 'The total fees applied to the invoice.', 'invoicing' ),
+					'description' => __('The total fees applied to the invoice.', 'invoicing'),
 					'type'        => 'number',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 					'readonly'    => true,
 				),
 
 				'subtotal'	  	  => array(
-					'description' => __( 'The sub-total for the invoice.', 'invoicing' ),
+					'description' => __('The sub-total for the invoice.', 'invoicing'),
 					'type'        => 'number',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 					'readonly'    => true,
 				),
 
 				'currency'	  	  => array(
-					'description' => __( 'The currency used to process the invoice.', 'invoicing' ),
+					'description' => __('The currency used to process the invoice.', 'invoicing'),
 					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 				),
 
 				'cart_details'	  => array(
-					'description' => __( 'The cart details for invoice.', 'invoicing' ),
+					'description' => __('The cart details for invoice.', 'invoicing'),
 					'type'        => 'array',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 					'required'	  => true,
 				),
 
 				'date'         => array(
-					'description' => __( "The date the invoice was published, in the site's timezone.", 'invoicing' ),
-					'type'        => array( 'string', 'null' ),
+					'description' => __("The date the invoice was published, in the site's timezone.", 'invoicing'),
+					'type'        => array('string', 'null'),
 					'format'      => 'date-time',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 				),
 
 				'due_date'     => array(
-					'description' => __( 'The due date for the invoice.', 'invoicing' ),
-					'type'        => array( 'string', 'null' ),
+					'description' => __('The due date for the invoice.', 'invoicing'),
+					'type'        => array('string', 'null'),
 					'format'      => 'date-time',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 				),
 
 				'completed_date'  => array(
-					'description' => __( 'The completed date for the invoice.', 'invoicing' ),
-					'type'        => array( 'string', 'null' ),
+					'description' => __('The completed date for the invoice.', 'invoicing'),
+					'type'        => array('string', 'null'),
 					'format'      => 'date-time',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 					'readonly'    => true,
 				),
 				
 				'link'         => array(
-					'description' => __( 'URL to the invoice.', 'invoicing' ),
+					'description' => __('URL to the invoice.', 'invoicing'),
 					'type'        => 'string',
 					'format'      => 'uri',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 					'readonly'    => true,
 				),
 
 				'mode'       	  => array(
-					'description' => __( 'The mode used to process the invoice.', 'invoicing' ),
+					'description' => __('The mode used to process the invoice.', 'invoicing'),
 					'type'        => 'string',
-					'enum'        => array( 'live', 'test' ),
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'enum'        => array('live', 'test'),
+					'context'     => array('view', 'edit', 'embed'),
 					'readonly'    => true,
 				),
 
 				'slug'       	  => array(
-					'description' => __( 'An alphanumeric identifier for the invoice.', 'invoicing' ),
+					'description' => __('An alphanumeric identifier for the invoice.', 'invoicing'),
 					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
+					'context'     => array('view', 'edit', 'embed'),
 					'arg_options' => array(
-						'sanitize_callback' => array( $this, 'sanitize_slug' ),
+						'sanitize_callback' => array($this, 'sanitize_slug'),
 					),
 					'readonly'    => true,
 				),
 
 				'status'       	  => array(
-					'description' => __( 'A named status for the invoice.', 'invoicing' ),
+					'description' => __('A named status for the invoice.', 'invoicing'),
 					'type'        => 'string',
 					'enum'        => $this->get_post_statuses(),
-					'context'     => array( 'view', 'edit' ),
+					'context'     => array('view', 'edit'),
 					'default'	  => 'wpi-pending',
 				),
 
 				'status_nicename' => array(
-					'description' => __( 'A human-readable status name for the invoice.', 'invoicing' ),
+					'description' => __('A human-readable status name for the invoice.', 'invoicing'),
 					'type'        => 'string',
-					'context'     => array( 'view', 'embed' ),
+					'context'     => array('view', 'embed'),
 					'readonly'    => true,
 				),
 
 				'post_type'       => array(
-					'description' => __( 'The post type for the invoice.', 'invoicing' ),
+					'description' => __('The post type for the invoice.', 'invoicing'),
 					'type'        => 'string',
-					'context'     => array( 'view' ),
+					'context'     => array('view'),
 					'readonly'    => true,
 				),
 			),
@@ -1404,12 +1404,12 @@ 
 		 *
 		 * @param array   $schema    The invoice schema.
 		 */
-        $schema = apply_filters( "wpinv_rest_invoice_schema", $schema );
+        $schema = apply_filters("wpinv_rest_invoice_schema", $schema);
 
 		// Cache the invoice schema.
 		$this->schema = $schema;
 		
-		return $this->add_additional_fields_schema( $this->schema );
+		return $this->add_additional_fields_schema($this->schema);
 	}
 
 	/**
@@ -1421,20 +1421,20 @@ 
 	 */
 	protected function get_schema_links() {
 
-		$href = rest_url( "{$this->namespace}/{$this->rest_base}/{id}" );
+		$href = rest_url("{$this->namespace}/{$this->rest_base}/{id}");
 
 		$links = array();
 
 		$links[] = array(
 			'rel'          => 'https://api.w.org/action-publish',
-			'title'        => __( 'The current user can mark this invoice as completed.', 'invoicing' ),
+			'title'        => __('The current user can mark this invoice as completed.', 'invoicing'),
 			'href'         => $href,
 			'targetSchema' => array(
 				'type'       => 'object',
 				'properties' => array(
 					'status' => array(
 						'type' => 'string',
-						'enum' => array( 'publish', 'wpi-renewal' ),
+						'enum' => array('publish', 'wpi-renewal'),
 					),
 				),
 			),
@@ -1442,7 +1442,7 @@ 
 
 		$links[] = array(
 			'rel'          => 'https://api.w.org/action-assign-author',
-			'title'        => __( 'The current user can change the owner of this invoice.', 'invoicing' ),
+			'title'        => __('The current user can change the owner of this invoice.', 'invoicing'),
 			'href'         => $href,
 			'targetSchema' => array(
 				'type'       => 'object',
@@ -1465,24 +1465,24 @@ 
 	 * @param WPInv_Invoice $invoice Invoice Object.
 	 * @return array Links for the given invoice.
 	 */
-	protected function prepare_links( $invoice ) {
+	protected function prepare_links($invoice) {
 
 		// Prepare the base REST API endpoint for invoices.
-		$base = sprintf( '%s/%s', $this->namespace, $this->rest_base );
+		$base = sprintf('%s/%s', $this->namespace, $this->rest_base);
 
 		// Entity meta.
 		$links = array(
 			'self'       => array(
-				'href' => rest_url( trailingslashit( $base ) . $invoice->ID ),
+				'href' => rest_url(trailingslashit($base) . $invoice->ID),
 			),
 			'collection' => array(
-				'href' => rest_url( $base ),
+				'href' => rest_url($base),
 			),
 		);
 
-		if ( ! empty( $invoice->user_id ) ) {
+		if (!empty($invoice->user_id)) {
 			$links['user'] = array(
-				'href'       => rest_url( 'wp/v2/users/' . $invoice->user_id ),
+				'href'       => rest_url('wp/v2/users/' . $invoice->user_id),
 				'embeddable' => true,
 			);
 		}
@@ -1496,7 +1496,7 @@ 
 		 *
 		 * @param array   $links    Rest links.
 		 */
-		return apply_filters( "wpinv_rest_invoice_links", $links );
+		return apply_filters("wpinv_rest_invoice_links", $links);
 
 	}
 
@@ -1509,24 +1509,24 @@ 
 	 * @param WP_REST_Request $request Request object.
 	 * @return array List of link relations.
 	 */
-	protected function get_available_actions( $invoice, $request ) {
+	protected function get_available_actions($invoice, $request) {
 
-		if ( 'edit' !== $request['context'] ) {
+		if ('edit' !== $request['context']) {
 			return array();
 		}
 
 		$rels = array();
 
 		// Retrieve the post type object.
-		$post_type = get_post_type_object( $invoice->post_type );
+		$post_type = get_post_type_object($invoice->post_type);
 
 		// Mark invoice as completed.
-		if ( current_user_can( $post_type->cap->publish_posts ) ) {
+		if (current_user_can($post_type->cap->publish_posts)) {
 			$rels[] = 'https://api.w.org/action-publish';
 		}
 
 		// Change the owner of the invoice.
-		if ( current_user_can( $post_type->cap->edit_others_posts ) ) {
+		if (current_user_can($post_type->cap->edit_others_posts)) {
 			$rels[] = 'https://api.w.org/action-assign-author';
 		}
 
@@ -1539,7 +1539,7 @@ 
 		 *
 		 * @param array   $rels    Available link relations.
 		 */
-		return apply_filters( "wpinv_rest_invoice_link_relations", $rels );
+		return apply_filters("wpinv_rest_invoice_link_relations", $rels);
 	}
 
 	/**
@@ -1552,8 +1552,8 @@ 
 	 * @param string          $parameter Additional parameter to pass to validation.
 	 * @return array|WP_Error A list of valid statuses, otherwise WP_Error object.
 	 */
-	public function sanitize_post_statuses( $statuses, $request, $parameter ) {
-		return array_intersect( wp_parse_slug_list( $statuses ), $this->get_post_statuses() );
+	public function sanitize_post_statuses($statuses, $request, $parameter) {
+		return array_intersect(wp_parse_slug_list($statuses), $this->get_post_statuses());
 	}
 
 	/**
@@ -1564,7 +1564,7 @@ 
 	 * @return array A list of registered item statuses.
 	 */
 	public function get_post_statuses() {
-		return array_keys( wpinv_get_invoice_statuses( true, true ) );
+		return array_keys(wpinv_get_invoice_statuses(true, true));
 	}
     
 }
\ No newline at end of file

includes/class-wpinv-api.php

Indentation +15 added lines, -15 removed lines

@@ -58,14 +58,14 @@ 
     }
 
 
-	/**
-	 * Registers routes
-	 *
+    /**
+     * Registers routes
+     *
      * @since 1.0.13
-	 */
-	public function register_rest_routes() {
+     */
+    public function register_rest_routes() {
 
-		// Invoices.
+        // Invoices.
         $this->invoices_controller->register_routes();
         
         // Items.
@@ -75,15 +75,15 @@ 
         $this->discounts_controller->register_routes();
 
         /**
-		 * Fires when registering Invoicing REST routes.
-		 *
-		 *
-		 * @since 1.0.15
-		 *
-		 *
-		 * @param array           $invoice_data Invoice properties.
-		 * @param WP_REST_Request $request The request used.
-		 */
+         * Fires when registering Invoicing REST routes.
+         *
+         *
+         * @since 1.0.15
+         *
+         *
+         * @param array           $invoice_data Invoice properties.
+         * @param WP_REST_Request $request The request used.
+         */
         do_action( "wpinv_register_rest_routes", $this );
         
     }

Spacing +12 added lines, -12 removed lines

@@ -7,7 +7,7 @@ 
  */
  
 // MUST have WordPress.
-if ( !defined( 'WPINC' ) ) {
+if (!defined('WPINC')) {
     exit;
 }
 
@@ -19,7 +19,7 @@ 
     /**
      * @param string A prefix for our REST routes
      */
-    public $api_namespace    = '';
+    public $api_namespace = '';
 
     /**
      * @param WPInv_REST_Invoice_Controller Invoices controller
@@ -42,19 +42,19 @@ 
      * @since 1.0.13
      * Sets the API namespace and inits hooks
      */
-    public function __construct( $api_namespace = 'invoicing/v1' ) {
+    public function __construct($api_namespace = 'invoicing/v1') {
 
         // Include controllers and related files
         $this->includes();
 
         // Set up class variables
-        $this->api_namespace       = apply_filters( 'wpinv_rest_api_namespace', $api_namespace );
-        $this->invoices_controller = new WPInv_REST_Invoice_Controller( $this->api_namespace );
-        $this->items_controller    = new WPInv_REST_Items_Controller( $this->api_namespace );
-        $this->discounts_controller= new WPInv_REST_Discounts_Controller( $this->api_namespace );
+        $this->api_namespace       = apply_filters('wpinv_rest_api_namespace', $api_namespace);
+        $this->invoices_controller = new WPInv_REST_Invoice_Controller($this->api_namespace);
+        $this->items_controller    = new WPInv_REST_Items_Controller($this->api_namespace);
+        $this->discounts_controller = new WPInv_REST_Discounts_Controller($this->api_namespace);
 
         //Register REST routes
-        add_action( 'rest_api_init', array( $this, 'register_rest_routes' ) );
+        add_action('rest_api_init', array($this, 'register_rest_routes'));
     }
 
 
@@ -84,7 +84,7 @@ 
 		 * @param array           $invoice_data Invoice properties.
 		 * @param WP_REST_Request $request The request used.
 		 */
-        do_action( "wpinv_register_rest_routes", $this );
+        do_action("wpinv_register_rest_routes", $this);
         
     }
 
@@ -97,13 +97,13 @@ 
     protected function includes() {
         
         // Invoices
-        require_once( WPINV_PLUGIN_DIR . 'includes/api/class-wpinv-rest-invoice-controller.php' );
+        require_once(WPINV_PLUGIN_DIR . 'includes/api/class-wpinv-rest-invoice-controller.php');
 
         // Items
-        require_once( WPINV_PLUGIN_DIR . 'includes/api/class-wpinv-rest-items-controller.php' );
+        require_once(WPINV_PLUGIN_DIR . 'includes/api/class-wpinv-rest-items-controller.php');
 
         // Discounts
-        require_once( WPINV_PLUGIN_DIR . 'includes/api/class-wpinv-rest-discounts-controller.php' );
+        require_once(WPINV_PLUGIN_DIR . 'includes/api/class-wpinv-rest-discounts-controller.php');
 
     }
     

includes/wpinv-general-functions.php

Spacing +177 added lines, -177 removed lines

@@ -7,201 +7,201 @@ 
  */
  
 // MUST have WordPress.
-if ( !defined( 'WPINC' ) ) {
-    exit( 'Do NOT access this file directly: ' . basename( __FILE__ ) );
+if (!defined('WPINC')) {
+    exit('Do NOT access this file directly: ' . basename(__FILE__));
 }
 
 function wpinv_is_checkout() {
     global $wp_query;
 
-    $is_object_set    = isset( $wp_query->queried_object );
-    $is_object_id_set = isset( $wp_query->queried_object_id );
-    $is_checkout      = is_page( wpinv_get_option( 'checkout_page' ) );
+    $is_object_set    = isset($wp_query->queried_object);
+    $is_object_id_set = isset($wp_query->queried_object_id);
+    $is_checkout      = is_page(wpinv_get_option('checkout_page'));
 
-    if ( !$is_object_set ) {
-        unset( $wp_query->queried_object );
+    if (!$is_object_set) {
+        unset($wp_query->queried_object);
     }
 
-    if ( !$is_object_id_set ) {
-        unset( $wp_query->queried_object_id );
+    if (!$is_object_id_set) {
+        unset($wp_query->queried_object_id);
     }
 
-    return apply_filters( 'wpinv_is_checkout', $is_checkout );
+    return apply_filters('wpinv_is_checkout', $is_checkout);
 }
 
 function wpinv_can_checkout() {
 	$can_checkout = true; // Always true for now
 
-	return (bool) apply_filters( 'wpinv_can_checkout', $can_checkout );
+	return (bool) apply_filters('wpinv_can_checkout', $can_checkout);
 }
 
 function wpinv_get_success_page_uri() {
-	$page_id = wpinv_get_option( 'success_page', 0 );
-	$page_id = absint( $page_id );
+	$page_id = wpinv_get_option('success_page', 0);
+	$page_id = absint($page_id);
 
-	return apply_filters( 'wpinv_get_success_page_uri', get_permalink( $page_id ) );
+	return apply_filters('wpinv_get_success_page_uri', get_permalink($page_id));
 }
 
 function wpinv_get_history_page_uri() {
-	$page_id = wpinv_get_option( 'invoice_history_page', 0 );
-	$page_id = absint( $page_id );
+	$page_id = wpinv_get_option('invoice_history_page', 0);
+	$page_id = absint($page_id);
 
-	return apply_filters( 'wpinv_get_history_page_uri', get_permalink( $page_id ) );
+	return apply_filters('wpinv_get_history_page_uri', get_permalink($page_id));
 }
 
 function wpinv_is_success_page() {
-	$is_success_page = wpinv_get_option( 'success_page', false );
-	$is_success_page = isset( $is_success_page ) ? is_page( $is_success_page ) : false;
+	$is_success_page = wpinv_get_option('success_page', false);
+	$is_success_page = isset($is_success_page) ? is_page($is_success_page) : false;
 
-	return apply_filters( 'wpinv_is_success_page', $is_success_page );
+	return apply_filters('wpinv_is_success_page', $is_success_page);
 }
 
 function wpinv_is_invoice_history_page() {
-	$ret = wpinv_get_option( 'invoice_history_page', false );
-	$ret = $ret ? is_page( $ret ) : false;
-	return apply_filters( 'wpinv_is_invoice_history_page', $ret );
+	$ret = wpinv_get_option('invoice_history_page', false);
+	$ret = $ret ? is_page($ret) : false;
+	return apply_filters('wpinv_is_invoice_history_page', $ret);
 }
 
 function wpinv_is_subscriptions_history_page() {
-    $ret = wpinv_get_option( 'invoice_subscription_page', false );
-    $ret = $ret ? is_page( $ret ) : false;
-    return apply_filters( 'wpinv_is_subscriptions_history_page', $ret );
+    $ret = wpinv_get_option('invoice_subscription_page', false);
+    $ret = $ret ? is_page($ret) : false;
+    return apply_filters('wpinv_is_subscriptions_history_page', $ret);
 }
 
-function wpinv_send_to_success_page( $args = null ) {
+function wpinv_send_to_success_page($args = null) {
 	$redirect = wpinv_get_success_page_uri();
     
-    if ( !empty( $args ) ) {
+    if (!empty($args)) {
         // Check for backward compatibility
-        if ( is_string( $args ) )
-            $args = str_replace( '?', '', $args );
+        if (is_string($args))
+            $args = str_replace('?', '', $args);
 
-        $args = wp_parse_args( $args );
+        $args = wp_parse_args($args);
 
-        $redirect = add_query_arg( $args, $redirect );
+        $redirect = add_query_arg($args, $redirect);
     }
 
-    $gateway = isset( $_REQUEST['wpi-gateway'] ) ? $_REQUEST['wpi-gateway'] : '';
+    $gateway = isset($_REQUEST['wpi-gateway']) ? $_REQUEST['wpi-gateway'] : '';
     
-    $redirect = apply_filters( 'wpinv_success_page_redirect', $redirect, $gateway, $args );
-    wp_redirect( $redirect );
+    $redirect = apply_filters('wpinv_success_page_redirect', $redirect, $gateway, $args);
+    wp_redirect($redirect);
     exit;
 }
 
-function wpinv_send_to_failed_page( $args = null ) {
+function wpinv_send_to_failed_page($args = null) {
 	$redirect = wpinv_get_failed_transaction_uri();
     
-    if ( !empty( $args ) ) {
+    if (!empty($args)) {
         // Check for backward compatibility
-        if ( is_string( $args ) )
-            $args = str_replace( '?', '', $args );
+        if (is_string($args))
+            $args = str_replace('?', '', $args);
 
-        $args = wp_parse_args( $args );
+        $args = wp_parse_args($args);
 
-        $redirect = add_query_arg( $args, $redirect );
+        $redirect = add_query_arg($args, $redirect);
     }
 
-    $gateway = isset( $_REQUEST['wpi-gateway'] ) ? $_REQUEST['wpi-gateway'] : '';
+    $gateway = isset($_REQUEST['wpi-gateway']) ? $_REQUEST['wpi-gateway'] : '';
     
-    $redirect = apply_filters( 'wpinv_failed_page_redirect', $redirect, $gateway, $args );
-    wp_redirect( $redirect );
+    $redirect = apply_filters('wpinv_failed_page_redirect', $redirect, $gateway, $args);
+    wp_redirect($redirect);
     exit;
 }
 
-function wpinv_get_checkout_uri( $args = array() ) {
-	$uri = wpinv_get_option( 'checkout_page', false );
-	$uri = isset( $uri ) ? get_permalink( $uri ) : NULL;
+function wpinv_get_checkout_uri($args = array()) {
+	$uri = wpinv_get_option('checkout_page', false);
+	$uri = isset($uri) ? get_permalink($uri) : NULL;
 
-	if ( !empty( $args ) ) {
+	if (!empty($args)) {
 		// Check for backward compatibility
-		if ( is_string( $args ) )
-			$args = str_replace( '?', '', $args );
+		if (is_string($args))
+			$args = str_replace('?', '', $args);
 
-		$args = wp_parse_args( $args );
+		$args = wp_parse_args($args);
 
-		$uri = add_query_arg( $args, $uri );
+		$uri = add_query_arg($args, $uri);
 	}
 
-	$scheme = defined( 'FORCE_SSL_ADMIN' ) && FORCE_SSL_ADMIN ? 'https' : 'admin';
+	$scheme = defined('FORCE_SSL_ADMIN') && FORCE_SSL_ADMIN ? 'https' : 'admin';
 
-	$ajax_url = admin_url( 'admin-ajax.php', $scheme );
+	$ajax_url = admin_url('admin-ajax.php', $scheme);
 
-	if ( ( ! preg_match( '/^https/', $uri ) && preg_match( '/^https/', $ajax_url ) ) || wpinv_is_ssl_enforced() ) {
-		$uri = preg_replace( '/^http:/', 'https:', $uri );
+	if ((!preg_match('/^https/', $uri) && preg_match('/^https/', $ajax_url)) || wpinv_is_ssl_enforced()) {
+		$uri = preg_replace('/^http:/', 'https:', $uri);
 	}
 
-	return apply_filters( 'wpinv_get_checkout_uri', $uri );
+	return apply_filters('wpinv_get_checkout_uri', $uri);
 }
 
-function wpinv_send_back_to_checkout( $args = array() ) {
+function wpinv_send_back_to_checkout($args = array()) {
 	$redirect = wpinv_get_checkout_uri();
 
-	if ( ! empty( $args ) ) {
+	if (!empty($args)) {
 		// Check for backward compatibility
-		if ( is_string( $args ) )
-			$args = str_replace( '?', '', $args );
+		if (is_string($args))
+			$args = str_replace('?', '', $args);
 
-		$args = wp_parse_args( $args );
+		$args = wp_parse_args($args);
 
-		$redirect = add_query_arg( $args, $redirect );
+		$redirect = add_query_arg($args, $redirect);
 	}
 
-	wp_redirect( apply_filters( 'wpinv_send_back_to_checkout', $redirect, $args ) );
+	wp_redirect(apply_filters('wpinv_send_back_to_checkout', $redirect, $args));
 	exit;
 }
 
-function wpinv_get_success_page_url( $query_string = null ) {
-	$success_page = wpinv_get_option( 'success_page', 0 );
-	$success_page = get_permalink( $success_page );
+function wpinv_get_success_page_url($query_string = null) {
+	$success_page = wpinv_get_option('success_page', 0);
+	$success_page = get_permalink($success_page);
 
-	if ( $query_string )
+	if ($query_string)
 		$success_page .= $query_string;
 
-	return apply_filters( 'wpinv_success_page_url', $success_page );
+	return apply_filters('wpinv_success_page_url', $success_page);
 }
 
-function wpinv_get_failed_transaction_uri( $extras = false ) {
-	$uri = wpinv_get_option( 'failure_page', '' );
-	$uri = ! empty( $uri ) ? trailingslashit( get_permalink( $uri ) ) : home_url();
+function wpinv_get_failed_transaction_uri($extras = false) {
+	$uri = wpinv_get_option('failure_page', '');
+	$uri = !empty($uri) ? trailingslashit(get_permalink($uri)) : home_url();
 
-	if ( $extras )
+	if ($extras)
 		$uri .= $extras;
 
-	return apply_filters( 'wpinv_get_failed_transaction_uri', $uri );
+	return apply_filters('wpinv_get_failed_transaction_uri', $uri);
 }
 
 function wpinv_is_failed_transaction_page() {
-	$ret = wpinv_get_option( 'failure_page', false );
-	$ret = isset( $ret ) ? is_page( $ret ) : false;
+	$ret = wpinv_get_option('failure_page', false);
+	$ret = isset($ret) ? is_page($ret) : false;
 
-	return apply_filters( 'wpinv_is_failure_page', $ret );
+	return apply_filters('wpinv_is_failure_page', $ret);
 }
 
-function wpinv_transaction_query( $type = 'start' ) {
+function wpinv_transaction_query($type = 'start') {
     global $wpdb;
 
     $wpdb->hide_errors();
 
-    if ( ! defined( 'WPINV_USE_TRANSACTIONS' ) ) {
-        define( 'WPINV_USE_TRANSACTIONS', true );
+    if (!defined('WPINV_USE_TRANSACTIONS')) {
+        define('WPINV_USE_TRANSACTIONS', true);
     }
 
-    if ( WPINV_USE_TRANSACTIONS ) {
-        switch ( $type ) {
+    if (WPINV_USE_TRANSACTIONS) {
+        switch ($type) {
             case 'commit' :
-                $wpdb->query( 'COMMIT' );
+                $wpdb->query('COMMIT');
                 break;
             case 'rollback' :
-                $wpdb->query( 'ROLLBACK' );
+                $wpdb->query('ROLLBACK');
                 break;
             default :
-                $wpdb->query( 'START TRANSACTION' );
+                $wpdb->query('START TRANSACTION');
             break;
         }
     }
 }
 
-function wpinv_create_invoice( $args = array(), $data = array(), $wp_error = false ) {
+function wpinv_create_invoice($args = array(), $data = array(), $wp_error = false) {
     $default_args = array(
         'status'        => '',
         'user_id'       => null,
@@ -212,66 +212,66 @@ 
         'post_type'     => 'wpi_invoice'
     );
 
-    $args           = wp_parse_args( $args, $default_args );
+    $args           = wp_parse_args($args, $default_args);
     $invoice_data   = array();
 
-    if ( $args['invoice_id'] > 0 ) {
-        $updating           = true;
+    if ($args['invoice_id'] > 0) {
+        $updating = true;
         $invoice_data['post_type']  = $args['post_type'];
         $invoice_data['ID']         = $args['invoice_id'];
     } else {
         $updating                       = false;
         $invoice_data['post_type']      = $args['post_type'];
-        $invoice_data['post_status']    = apply_filters( 'wpinv_default_invoice_status', 'wpi-pending' );
+        $invoice_data['post_status']    = apply_filters('wpinv_default_invoice_status', 'wpi-pending');
         $invoice_data['ping_status']    = 'closed';
-        $invoice_data['post_author']    = !empty( $args['user_id'] ) ? $args['user_id'] : get_current_user_id();
-        $invoice_data['post_title']     = wpinv_format_invoice_number( '0' );
-        $invoice_data['post_parent']    = absint( $args['parent'] );
-        if ( !empty( $args['created_date'] ) ) {
+        $invoice_data['post_author']    = !empty($args['user_id']) ? $args['user_id'] : get_current_user_id();
+        $invoice_data['post_title']     = wpinv_format_invoice_number('0');
+        $invoice_data['post_parent']    = absint($args['parent']);
+        if (!empty($args['created_date'])) {
             $invoice_data['post_date']      = $args['created_date'];
-            $invoice_data['post_date_gmt']  = get_gmt_from_date( $args['created_date'] );
+            $invoice_data['post_date_gmt']  = get_gmt_from_date($args['created_date']);
         }
     }
 
-    if ( $args['status'] ) {
-        if ( ! in_array( $args['status'], array_keys( wpinv_get_invoice_statuses() ) ) && 'wpi_invoice' === $invoice_data['post_type'] ) {
-            return new WP_Error( 'wpinv_invalid_invoice_status', wp_sprintf( __( 'Invalid invoice status: %s', 'invoicing' ), $args['status'] ) );
+    if ($args['status']) {
+        if (!in_array($args['status'], array_keys(wpinv_get_invoice_statuses())) && 'wpi_invoice' === $invoice_data['post_type']) {
+            return new WP_Error('wpinv_invalid_invoice_status', wp_sprintf(__('Invalid invoice status: %s', 'invoicing'), $args['status']));
         }
-        $invoice_data['post_status']    = $args['status'];
+        $invoice_data['post_status'] = $args['status'];
     }
 
-    if ( ! is_null( $args['user_note'] ) ) {
-        $invoice_data['post_excerpt']   = $args['user_note'];
+    if (!is_null($args['user_note'])) {
+        $invoice_data['post_excerpt'] = $args['user_note'];
     }
 
-    if ( $updating ) {
-        $invoice_id = wp_update_post( $invoice_data, true );
+    if ($updating) {
+        $invoice_id = wp_update_post($invoice_data, true);
     } else {
-        $invoice_id = wp_insert_post( apply_filters( 'wpinv_new_invoice_data', $invoice_data ), true );
+        $invoice_id = wp_insert_post(apply_filters('wpinv_new_invoice_data', $invoice_data), true);
     }
 
-    if ( is_wp_error( $invoice_id ) ) {
+    if (is_wp_error($invoice_id)) {
         return $wp_error ? $invoice_id : 0;
     }
     
-    $invoice = wpinv_get_invoice( $invoice_id );
-
-    if ( !$updating ) {
-        update_post_meta( $invoice_id, '_wpinv_key', apply_filters( 'wpinv_generate_invoice_key', uniqid( 'wpinv_' ) ) );
-        update_post_meta( $invoice_id, '_wpinv_currency', wpinv_get_currency() );
-        update_post_meta( $invoice_id, '_wpinv_include_tax', get_option( 'wpinv_prices_include_tax' ) );
-        update_post_meta( $invoice_id, '_wpinv_user_ip', wpinv_get_ip() );
-        update_post_meta( $invoice_id, '_wpinv_user_agent', wpinv_get_user_agent() );
-        update_post_meta( $invoice_id, '_wpinv_created_via', sanitize_text_field( $args['created_via'] ) );
+    $invoice = wpinv_get_invoice($invoice_id);
+
+    if (!$updating) {
+        update_post_meta($invoice_id, '_wpinv_key', apply_filters('wpinv_generate_invoice_key', uniqid('wpinv_')));
+        update_post_meta($invoice_id, '_wpinv_currency', wpinv_get_currency());
+        update_post_meta($invoice_id, '_wpinv_include_tax', get_option('wpinv_prices_include_tax'));
+        update_post_meta($invoice_id, '_wpinv_user_ip', wpinv_get_ip());
+        update_post_meta($invoice_id, '_wpinv_user_agent', wpinv_get_user_agent());
+        update_post_meta($invoice_id, '_wpinv_created_via', sanitize_text_field($args['created_via']));
         
         // Add invoice note
-        if ( ! $invoice->is_quote() ) {
-            $invoice->add_note( wp_sprintf( __( 'Invoice is created with status %s.', 'invoicing' ), wpinv_status_nicename( $invoice->status ) ) );
+        if (!$invoice->is_quote()) {
+            $invoice->add_note(wp_sprintf(__('Invoice is created with status %s.', 'invoicing'), wpinv_status_nicename($invoice->status)));
         }
         
     }
 
-    update_post_meta( $invoice_id, '_wpinv_version', WPINV_VERSION );
+    update_post_meta($invoice_id, '_wpinv_version', WPINV_VERSION);
 
     return $invoice;
 }
@@ -279,184 +279,184 @@ 
 function wpinv_get_prefix() {
     $invoice_prefix = 'INV-';
     
-    return apply_filters( 'wpinv_get_prefix', $invoice_prefix );
+    return apply_filters('wpinv_get_prefix', $invoice_prefix);
 }
 
 function wpinv_get_business_logo() {
-    $business_logo = wpinv_get_option( 'logo' );
-    return apply_filters( 'wpinv_get_business_logo', $business_logo );
+    $business_logo = wpinv_get_option('logo');
+    return apply_filters('wpinv_get_business_logo', $business_logo);
 }
 
 function wpinv_get_business_name() {
     $business_name = wpinv_get_option('store_name');
-    return apply_filters( 'wpinv_get_business_name', $business_name );
+    return apply_filters('wpinv_get_business_name', $business_name);
 }
 
 function wpinv_get_blogname() {
-    return wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
+    return wp_specialchars_decode(get_option('blogname'), ENT_QUOTES);
 }
 
 function wpinv_get_admin_email() {
-    $admin_email = get_option( 'admin_email' );
-    return apply_filters( 'wpinv_admin_email', $admin_email );
+    $admin_email = get_option('admin_email');
+    return apply_filters('wpinv_admin_email', $admin_email);
 }
 
 function wpinv_get_business_website() {
-    $business_website = home_url( '/' );
-    return apply_filters( 'wpinv_get_business_website', $business_website );
+    $business_website = home_url('/');
+    return apply_filters('wpinv_get_business_website', $business_website);
 }
 
-function wpinv_get_terms_text( $invoice_id = 0 ) {
+function wpinv_get_terms_text($invoice_id = 0) {
     $terms_text = '';
-    return apply_filters( 'wpinv_get_terms_text', $terms_text, $invoice_id );
+    return apply_filters('wpinv_get_terms_text', $terms_text, $invoice_id);
 }
 
 function wpinv_get_business_footer() {
-    $site_link = '<a target="_blank" href="' . esc_url( wpinv_get_business_website() ) . '">' . esc_html( wpinv_get_business_name() ) . '</a>';
-    $business_footer = wp_sprintf( __( 'Thanks for using %s', 'invoicing' ), $site_link );
-    return apply_filters( 'wpinv_get_business_footer', $business_footer );
+    $site_link = '<a target="_blank" href="' . esc_url(wpinv_get_business_website()) . '">' . esc_html(wpinv_get_business_name()) . '</a>';
+    $business_footer = wp_sprintf(__('Thanks for using %s', 'invoicing'), $site_link);
+    return apply_filters('wpinv_get_business_footer', $business_footer);
 }
 
 function wpinv_checkout_required_fields() {
     $required_fields = array();
     
     // Let payment gateways and other extensions determine if address fields should be required
-    $require_billing_details = apply_filters( 'wpinv_checkout_required_billing_details', wpinv_use_taxes() );
+    $require_billing_details = apply_filters('wpinv_checkout_required_billing_details', wpinv_use_taxes());
     
-    if ( $require_billing_details ) {
-		if ( (bool)wpinv_get_option( 'fname_mandatory' ) ) {
+    if ($require_billing_details) {
+		if ((bool) wpinv_get_option('fname_mandatory')) {
 			$required_fields['first_name'] = array(
 				'error_id' => 'invalid_first_name',
-				'error_message' => __( 'Please enter your first name', 'invoicing' )
+				'error_message' => __('Please enter your first name', 'invoicing')
 			);
 		}
-		if ( (bool)wpinv_get_option( 'address_mandatory' ) ) {
+		if ((bool) wpinv_get_option('address_mandatory')) {
 			$required_fields['address'] = array(
 				'error_id' => 'invalid_address',
-				'error_message' => __( 'Please enter your address', 'invoicing' )
+				'error_message' => __('Please enter your address', 'invoicing')
 			);
 		}
-		if ( (bool)wpinv_get_option( 'city_mandatory' ) ) {
+		if ((bool) wpinv_get_option('city_mandatory')) {
 			$required_fields['city'] = array(
 				'error_id' => 'invalid_city',
-				'error_message' => __( 'Please enter your billing city', 'invoicing' )
+				'error_message' => __('Please enter your billing city', 'invoicing')
 			);
 		}
-		if ( (bool)wpinv_get_option( 'state_mandatory' ) ) {
+		if ((bool) wpinv_get_option('state_mandatory')) {
 			$required_fields['state'] = array(
 				'error_id' => 'invalid_state',
-				'error_message' => __( 'Please enter billing state / province', 'invoicing' )
+				'error_message' => __('Please enter billing state / province', 'invoicing')
 			);
 		}
-		if ( (bool)wpinv_get_option( 'country_mandatory' ) ) {
+		if ((bool) wpinv_get_option('country_mandatory')) {
 			$required_fields['country'] = array(
 				'error_id' => 'invalid_country',
-				'error_message' => __( 'Please select your billing country', 'invoicing' )
+				'error_message' => __('Please select your billing country', 'invoicing')
 			);
 		}
     }
 
-    return apply_filters( 'wpinv_checkout_required_fields', $required_fields );
+    return apply_filters('wpinv_checkout_required_fields', $required_fields);
 }
 
 function wpinv_is_ssl_enforced() {
-    $ssl_enforced = wpinv_get_option( 'enforce_ssl', false );
-    return (bool) apply_filters( 'wpinv_is_ssl_enforced', $ssl_enforced );
+    $ssl_enforced = wpinv_get_option('enforce_ssl', false);
+    return (bool) apply_filters('wpinv_is_ssl_enforced', $ssl_enforced);
 }
 
-function wpinv_user_can_view_invoice( $post ) {
+function wpinv_user_can_view_invoice($post) {
     $allow = false;
 
-    $post = get_post( $post );
+    $post = get_post($post);
 
-    if ( empty( $post->ID ) ) {
+    if (empty($post->ID)) {
         return $allow;
     }
 
-    $invoice = wpinv_get_invoice( $post->ID );
-    if ( empty( $invoice->ID ) ) {
+    $invoice = wpinv_get_invoice($post->ID);
+    if (empty($invoice->ID)) {
         return $allow;
     }
 
     // Don't allow trash, draft status
-    if ( $invoice->has_status( array_keys( wpinv_get_invoice_statuses() ) ) ) {
-        if ( wpinv_current_user_can_manage_invoicing() || current_user_can( 'view_invoices', $invoice->ID ) ) { // Admin user
+    if ($invoice->has_status(array_keys(wpinv_get_invoice_statuses()))) {
+        if (wpinv_current_user_can_manage_invoicing() || current_user_can('view_invoices', $invoice->ID)) { // Admin user
             $allow = true;
         } else {
-            if ( is_user_logged_in() ) {
-                if ( (int)$invoice->get_user_id() === (int)get_current_user_id() ) {
+            if (is_user_logged_in()) {
+                if ((int) $invoice->get_user_id() === (int) get_current_user_id()) {
                     $allow = true;
-                } else if ( !wpinv_require_login_to_checkout() && isset( $_GET['invoice_key'] ) && $_GET['invoice_key'] === $invoice->get_key() ) {
+                } else if (!wpinv_require_login_to_checkout() && isset($_GET['invoice_key']) && $_GET['invoice_key'] === $invoice->get_key()) {
                     $allow = true;
                 }
             } else {
-                if ( !wpinv_require_login_to_checkout() && isset( $_GET['invoice_key'] ) && $_GET['invoice_key'] === $invoice->get_key() ) {
+                if (!wpinv_require_login_to_checkout() && isset($_GET['invoice_key']) && $_GET['invoice_key'] === $invoice->get_key()) {
                     $allow = true;
                 }
             }
         }
     }
     
-    return apply_filters( 'wpinv_can_print_invoice', $allow, $post, $invoice );
+    return apply_filters('wpinv_can_print_invoice', $allow, $post, $invoice);
 }
 
 function wpinv_schedule_events() {
     // hourly, daily and twicedaily
-    if ( !wp_next_scheduled( 'wpinv_register_schedule_event_twicedaily' ) ) {
-        wp_schedule_event( current_time( 'timestamp' ), 'twicedaily', 'wpinv_register_schedule_event_twicedaily' );
+    if (!wp_next_scheduled('wpinv_register_schedule_event_twicedaily')) {
+        wp_schedule_event(current_time('timestamp'), 'twicedaily', 'wpinv_register_schedule_event_twicedaily');
     }
 }
-add_action( 'wp', 'wpinv_schedule_events' );
+add_action('wp', 'wpinv_schedule_events');
 
 function wpinv_schedule_event_twicedaily() {
     wpinv_email_payment_reminders();
 }
-add_action( 'wpinv_register_schedule_event_twicedaily', 'wpinv_schedule_event_twicedaily' );
+add_action('wpinv_register_schedule_event_twicedaily', 'wpinv_schedule_event_twicedaily');
 
 function wpinv_require_login_to_checkout() {
-    $return = wpinv_get_option( 'login_to_checkout', false );
-    return (bool) apply_filters( 'wpinv_require_login_to_checkout', $return );
+    $return = wpinv_get_option('login_to_checkout', false);
+    return (bool) apply_filters('wpinv_require_login_to_checkout', $return);
 }
 
-function wpinv_sequential_number_active( $type = '' ) {
-    $check = apply_filters( 'wpinv_pre_check_sequential_number_active', null, $type );
-    if ( null !== $check ) {
+function wpinv_sequential_number_active($type = '') {
+    $check = apply_filters('wpinv_pre_check_sequential_number_active', null, $type);
+    if (null !== $check) {
         return $check;
     }
     
-    return wpinv_get_option( 'sequential_invoice_number' );
+    return wpinv_get_option('sequential_invoice_number');
 }
 
-function wpinv_switch_to_locale( $locale = NULL ) {
+function wpinv_switch_to_locale($locale = NULL) {
     global $invoicing, $wpi_switch_locale;
 
-    if ( ! empty( $invoicing ) && function_exists( 'switch_to_locale' ) ) {
-        $locale = empty( $locale ) ? get_locale() : $locale;
+    if (!empty($invoicing) && function_exists('switch_to_locale')) {
+        $locale = empty($locale) ? get_locale() : $locale;
 
-        switch_to_locale( $locale );
+        switch_to_locale($locale);
 
         $wpi_switch_locale = $locale;
 
-        add_filter( 'plugin_locale', 'get_locale' );
+        add_filter('plugin_locale', 'get_locale');
 
         $invoicing->load_textdomain();
 
-        do_action( 'wpinv_switch_to_locale', $locale );
+        do_action('wpinv_switch_to_locale', $locale);
     }
 }
 
 function wpinv_restore_locale() {
     global $invoicing, $wpi_switch_locale;
     
-    if ( ! empty( $invoicing ) && function_exists( 'restore_previous_locale' ) && $wpi_switch_locale ) {
+    if (!empty($invoicing) && function_exists('restore_previous_locale') && $wpi_switch_locale) {
         restore_previous_locale();
 
         $wpi_switch_locale = NULL;
 
-        remove_filter( 'plugin_locale', 'get_locale' );
+        remove_filter('plugin_locale', 'get_locale');
 
         $invoicing->load_textdomain();
 
-        do_action( 'wpinv_restore_locale' );
+        do_action('wpinv_restore_locale');
     }
 }
\ No newline at end of file

includes/wpinv-invoice-functions.php

Spacing +775 added lines, -775 removed lines

@@ -7,14 +7,14 @@ 
  */
  
 // MUST have WordPress.
-if ( !defined( 'WPINC' ) ) {
-    exit( 'Do NOT access this file directly: ' . basename( __FILE__ ) );
+if (!defined('WPINC')) {
+    exit('Do NOT access this file directly: ' . basename(__FILE__));
 }
 
 function wpinv_get_invoice_cart_id() {
     $wpinv_checkout = wpinv_get_checkout_session();
     
-    if ( !empty( $wpinv_checkout['invoice_id'] ) ) {
+    if (!empty($wpinv_checkout['invoice_id'])) {
         return $wpinv_checkout['invoice_id'];
     }
     
@@ -28,48 +28,48 @@ 
  * @param  bool          $wp_error       Whether to return false or WP_Error on failure.
  * @return mixed         The value 0 or WP_Error on failure. The WPInv_Invoice object on success.
  */
-function wpinv_insert_invoice( $invoice_data = array(), $wp_error = false ) {
-    if ( empty( $invoice_data ) ) {
+function wpinv_insert_invoice($invoice_data = array(), $wp_error = false) {
+    if (empty($invoice_data)) {
         return false;
     }
     
-    if ( !( !empty( $invoice_data['cart_details'] ) && is_array( $invoice_data['cart_details'] ) ) ) {
-        return $wp_error ? new WP_Error( 'wpinv_invalid_items', __( 'Invoice must have atleast one item.', 'invoicing' ) ) : 0;
+    if (!(!empty($invoice_data['cart_details']) && is_array($invoice_data['cart_details']))) {
+        return $wp_error ? new WP_Error('wpinv_invalid_items', __('Invoice must have atleast one item.', 'invoicing')) : 0;
     }
     
     // If no user id is provided, default to the current user id
-    if ( empty( $invoice_data['user_id'] ) ) {
+    if (empty($invoice_data['user_id'])) {
         $invoice_data['user_id'] = get_current_user_id();
     }
     
-    $invoice_data['invoice_id'] = !empty( $invoice_data['invoice_id'] ) ? (int)$invoice_data['invoice_id'] : 0;
+    $invoice_data['invoice_id'] = !empty($invoice_data['invoice_id']) ? (int) $invoice_data['invoice_id'] : 0;
     
-    if ( empty( $invoice_data['status'] ) ) {
+    if (empty($invoice_data['status'])) {
         $invoice_data['status'] = 'wpi-pending';
     }
 
-    if ( empty( $invoice_data['post_type'] ) ) {
+    if (empty($invoice_data['post_type'])) {
         $invoice_data['post_type'] = 'wpi-invoice';
     }
     
-    if ( empty( $invoice_data['ip'] ) ) {
+    if (empty($invoice_data['ip'])) {
         $invoice_data['ip'] = wpinv_get_ip();
     }
 
     // default invoice args, note that status is checked for validity in wpinv_create_invoice()
     $default_args = array(
-        'invoice_id'    => (int)$invoice_data['invoice_id'],
-        'user_id'       => (int)$invoice_data['user_id'],
+        'invoice_id'    => (int) $invoice_data['invoice_id'],
+        'user_id'       => (int) $invoice_data['user_id'],
         'status'        => $invoice_data['status'],
         'post_type'     => $invoice_data['post_type'],
     );
 
-    $invoice = wpinv_create_invoice( $default_args, $invoice_data, true );
-    if ( is_wp_error( $invoice ) ) {
+    $invoice = wpinv_create_invoice($default_args, $invoice_data, true);
+    if (is_wp_error($invoice)) {
         return $wp_error ? $invoice : 0;
     }
     
-    if ( empty( $invoice_data['invoice_id'] ) ) {
+    if (empty($invoice_data['invoice_id'])) {
         //$invoice->add_note( wp_sprintf( __( 'Invoice is created with status %s.', 'invoicing' ), wpinv_status_nicename( $invoice->status ) ) );
     }
     
@@ -92,24 +92,24 @@ 
         'discount'              => array(),
     );
 
-    if ( $user_id = (int)$invoice->get_user_id() ) {
-        if ( $user_address = wpinv_get_user_address( $user_id ) ) {
-            $default_user_info = wp_parse_args( $user_address, $default_user_info );
+    if ($user_id = (int) $invoice->get_user_id()) {
+        if ($user_address = wpinv_get_user_address($user_id)) {
+            $default_user_info = wp_parse_args($user_address, $default_user_info);
         }
     }
     
-    if ( empty( $invoice_data['user_info'] ) ) {
+    if (empty($invoice_data['user_info'])) {
         $invoice_data['user_info'] = array();
     }
     
-    $user_info = wp_parse_args( $invoice_data['user_info'], $default_user_info );
+    $user_info = wp_parse_args($invoice_data['user_info'], $default_user_info);
     
-    if ( empty( $user_info['first_name'] ) ) {
+    if (empty($user_info['first_name'])) {
         $user_info['first_name'] = $default_user_info['first_name'];
         $user_info['last_name'] = $default_user_info['last_name'];
     }
     
-    if ( empty( $user_info['country'] ) ) {
+    if (empty($user_info['country'])) {
         $user_info['country'] = $default_user_info['country'];
         $user_info['state'] = $default_user_info['state'];
         $user_info['city'] = $default_user_info['city'];
@@ -118,13 +118,13 @@ 
         $user_info['phone'] = $default_user_info['phone'];
     }
     
-    if ( !empty( $user_info['discount'] ) && !is_array( $user_info['discount'] ) ) {
-        $user_info['discount'] = (array)$user_info['discount'];
+    if (!empty($user_info['discount']) && !is_array($user_info['discount'])) {
+        $user_info['discount'] = (array) $user_info['discount'];
     }
 
     // Payment details
     $payment_details = array();
-    if ( !empty( $invoice_data['payment_details'] ) ) {
+    if (!empty($invoice_data['payment_details'])) {
         $default_payment_details = array(
             'gateway'           => 'manual',
             'gateway_title'     => '',
@@ -132,56 +132,56 @@ 
             'transaction_id'    => '',
         );
         
-        $payment_details = wp_parse_args( $invoice_data['payment_details'], $default_payment_details );
+        $payment_details = wp_parse_args($invoice_data['payment_details'], $default_payment_details);
         
-        if ( empty( $payment_details['gateway'] ) ) {
+        if (empty($payment_details['gateway'])) {
             $payment_details['gateway'] = 'manual';
         }
         
-        if ( empty( $payment_details['currency'] ) ) {
+        if (empty($payment_details['currency'])) {
             $payment_details['currency'] = wpinv_get_default_country();
         }
         
-        if ( empty( $payment_details['gateway_title'] ) ) {
-            $payment_details['gateway_title'] = wpinv_get_gateway_checkout_label( $payment_details['gateway'] );
+        if (empty($payment_details['gateway_title'])) {
+            $payment_details['gateway_title'] = wpinv_get_gateway_checkout_label($payment_details['gateway']);
         }
     }
     
-    $invoice->set( 'status', ( !empty( $invoice_data['status'] ) ? $invoice_data['status'] : 'wpi-pending' ) );
-    
-    if ( !empty( $payment_details ) ) {
-        $invoice->set( 'currency', $payment_details['currency'] );
-        $invoice->set( 'gateway', $payment_details['gateway'] );
-        $invoice->set( 'gateway_title', $payment_details['gateway_title'] );
-        $invoice->set( 'transaction_id', $payment_details['transaction_id'] );
-    }
-    
-    $invoice->set( 'user_info', $user_info );
-    $invoice->set( 'first_name', $user_info['first_name'] );
-    $invoice->set( 'last_name', $user_info['last_name'] );
-    $invoice->set( 'address', $user_info['address'] );
-    $invoice->set( 'company', $user_info['company'] );
-    $invoice->set( 'vat_number', $user_info['vat_number'] );
-    $invoice->set( 'phone', $user_info['phone'] );
-    $invoice->set( 'city', $user_info['city'] );
-    $invoice->set( 'country', $user_info['country'] );
-    $invoice->set( 'state', $user_info['state'] );
-    $invoice->set( 'zip', $user_info['zip'] );
-    $invoice->set( 'discounts', $user_info['discount'] );
-    $invoice->set( 'ip', ( !empty( $invoice_data['ip'] ) ? $invoice_data['ip'] : wpinv_get_ip() ) );
-    $invoice->set( 'mode', ( wpinv_is_test_mode() ? 'test' : 'live' ) );
-    $invoice->set( 'parent_invoice', ( !empty( $invoice_data['parent'] ) ? absint( $invoice_data['parent'] ) : '' ) );
-    
-    if ( !empty( $invoice_data['cart_details'] ) && is_array( $invoice_data['cart_details'] ) ) {
-        foreach ( $invoice_data['cart_details'] as $key => $item ) {
-            $item_id        = !empty( $item['id'] ) ? $item['id'] : 0;
-            $quantity       = !empty( $item['quantity'] ) ? $item['quantity'] : 1;
-            $name           = !empty( $item['name'] ) ? $item['name'] : '';
-            $item_price     = isset( $item['item_price'] ) ? $item['item_price'] : '';
+    $invoice->set('status', (!empty($invoice_data['status']) ? $invoice_data['status'] : 'wpi-pending'));
+    
+    if (!empty($payment_details)) {
+        $invoice->set('currency', $payment_details['currency']);
+        $invoice->set('gateway', $payment_details['gateway']);
+        $invoice->set('gateway_title', $payment_details['gateway_title']);
+        $invoice->set('transaction_id', $payment_details['transaction_id']);
+    }
+    
+    $invoice->set('user_info', $user_info);
+    $invoice->set('first_name', $user_info['first_name']);
+    $invoice->set('last_name', $user_info['last_name']);
+    $invoice->set('address', $user_info['address']);
+    $invoice->set('company', $user_info['company']);
+    $invoice->set('vat_number', $user_info['vat_number']);
+    $invoice->set('phone', $user_info['phone']);
+    $invoice->set('city', $user_info['city']);
+    $invoice->set('country', $user_info['country']);
+    $invoice->set('state', $user_info['state']);
+    $invoice->set('zip', $user_info['zip']);
+    $invoice->set('discounts', $user_info['discount']);
+    $invoice->set('ip', (!empty($invoice_data['ip']) ? $invoice_data['ip'] : wpinv_get_ip()));
+    $invoice->set('mode', (wpinv_is_test_mode() ? 'test' : 'live'));
+    $invoice->set('parent_invoice', (!empty($invoice_data['parent']) ? absint($invoice_data['parent']) : ''));
+    
+    if (!empty($invoice_data['cart_details']) && is_array($invoice_data['cart_details'])) {
+        foreach ($invoice_data['cart_details'] as $key => $item) {
+            $item_id        = !empty($item['id']) ? $item['id'] : 0;
+            $quantity       = !empty($item['quantity']) ? $item['quantity'] : 1;
+            $name           = !empty($item['name']) ? $item['name'] : '';
+            $item_price     = isset($item['item_price']) ? $item['item_price'] : '';
             
-            $post_item  = new WPInv_Item( $item_id );
-            if ( !empty( $post_item ) ) {
-                $name       = !empty( $name ) ? $name : $post_item->get_name();
+            $post_item = new WPInv_Item($item_id);
+            if (!empty($post_item)) {
+                $name       = !empty($name) ? $name : $post_item->get_name();
                 $item_price = $item_price !== '' ? $item_price : $post_item->get_price();
             } else {
                 continue;
@@ -191,262 +191,262 @@ 
                 'name'          => $name,
                 'quantity'      => $quantity,
                 'item_price'    => $item_price,
-                'custom_price'  => isset( $item['custom_price'] ) ? $item['custom_price'] : '',
-                'tax'           => !empty( $item['tax'] ) ? $item['tax'] : 0.00,
-                'discount'      => isset( $item['discount'] ) ? $item['discount'] : 0,
-                'meta'          => isset( $item['meta'] ) ? $item['meta'] : array(),
-                'fees'          => isset( $item['fees'] ) ? $item['fees'] : array(),
+                'custom_price'  => isset($item['custom_price']) ? $item['custom_price'] : '',
+                'tax'           => !empty($item['tax']) ? $item['tax'] : 0.00,
+                'discount'      => isset($item['discount']) ? $item['discount'] : 0,
+                'meta'          => isset($item['meta']) ? $item['meta'] : array(),
+                'fees'          => isset($item['fees']) ? $item['fees'] : array(),
             );
 
-            $invoice->add_item( $item_id, $args );
+            $invoice->add_item($item_id, $args);
         }
     }
 
-    $invoice->increase_tax( wpinv_get_cart_fee_tax() );
+    $invoice->increase_tax(wpinv_get_cart_fee_tax());
 
-    if ( isset( $invoice_data['post_date'] ) ) {
-        $invoice->set( 'date', $invoice_data['post_date'] );
+    if (isset($invoice_data['post_date'])) {
+        $invoice->set('date', $invoice_data['post_date']);
     }
     
     // Invoice due date
-    if ( isset( $invoice_data['due_date'] ) ) {
-        $invoice->set( 'due_date', $invoice_data['due_date'] );
+    if (isset($invoice_data['due_date'])) {
+        $invoice->set('due_date', $invoice_data['due_date']);
     }
     
     $invoice->save();
     
     // Add notes
-    if ( !empty( $invoice_data['private_note'] ) ) {
-        $invoice->add_note( $invoice_data['private_note'] );
+    if (!empty($invoice_data['private_note'])) {
+        $invoice->add_note($invoice_data['private_note']);
     }
-    if ( !empty( $invoice_data['user_note'] ) ) {
-        $invoice->add_note( $invoice_data['user_note'], true );
+    if (!empty($invoice_data['user_note'])) {
+        $invoice->add_note($invoice_data['user_note'], true);
     }
     
-    if ( $invoice->is_quote() ) {
+    if ($invoice->is_quote()) {
 
-        if ( isset( $invoice_data['valid_until'] ) ) {
-            update_post_meta( $invoice->ID, 'wpinv_quote_valid_until', $invoice_data['valid_until'] );
+        if (isset($invoice_data['valid_until'])) {
+            update_post_meta($invoice->ID, 'wpinv_quote_valid_until', $invoice_data['valid_until']);
         }
         return $invoice;
 
     }
 
-    do_action( 'wpinv_insert_invoice', $invoice->ID, $invoice_data );
+    do_action('wpinv_insert_invoice', $invoice->ID, $invoice_data);
 
-    if ( ! empty( $invoice->ID ) ) {
+    if (!empty($invoice->ID)) {
         global $wpi_userID, $wpinv_ip_address_country;
         
         $checkout_session = wpinv_get_checkout_session();
         
         $data_session                   = array();
         $data_session['invoice_id']     = $invoice->ID;
-        $data_session['cart_discounts'] = $invoice->get_discounts( true );
+        $data_session['cart_discounts'] = $invoice->get_discounts(true);
         
-        wpinv_set_checkout_session( $data_session );
+        wpinv_set_checkout_session($data_session);
         
-        $wpi_userID         = (int)$invoice->get_user_id();
+        $wpi_userID         = (int) $invoice->get_user_id();
         
-        $_POST['country']   = !empty( $invoice->country ) ? $invoice->country : wpinv_get_default_country();
+        $_POST['country']   = !empty($invoice->country) ? $invoice->country : wpinv_get_default_country();
         $_POST['state']     = $invoice->state;
 
-        $invoice->set( 'country', sanitize_text_field( $_POST['country'] ) );
-        $invoice->set( 'state', sanitize_text_field( $_POST['state'] ) );
+        $invoice->set('country', sanitize_text_field($_POST['country']));
+        $invoice->set('state', sanitize_text_field($_POST['state']));
         
         $wpinv_ip_address_country = $invoice->country;
         
-        $invoice = $invoice->recalculate_totals( true );
+        $invoice = $invoice->recalculate_totals(true);
         
-        wpinv_set_checkout_session( $checkout_session );
+        wpinv_set_checkout_session($checkout_session);
                     
         return $invoice;
     }
     
-    if ( $wp_error ) {
-        if ( is_wp_error( $invoice ) ) {
+    if ($wp_error) {
+        if (is_wp_error($invoice)) {
             return $invoice;
         } else {
-            return new WP_Error( 'wpinv_insert_invoice_error', __( 'Error in insert invoice.', 'invoicing' ) );
+            return new WP_Error('wpinv_insert_invoice_error', __('Error in insert invoice.', 'invoicing'));
         }
     } else {
         return 0;
     }
 }
 
-function wpinv_update_invoice( $invoice_data = array(), $wp_error = false ) {
-    $invoice_ID = !empty( $invoice_data['ID'] ) ? absint( $invoice_data['ID'] ) : NULL;
+function wpinv_update_invoice($invoice_data = array(), $wp_error = false) {
+    $invoice_ID = !empty($invoice_data['ID']) ? absint($invoice_data['ID']) : NULL;
 
-    if ( !$invoice_ID ) {
-        if ( $wp_error ) {
-            return new WP_Error( 'invalid_invoice_id', __( 'Invalid invoice ID.', 'invoicing' ) );
+    if (!$invoice_ID) {
+        if ($wp_error) {
+            return new WP_Error('invalid_invoice_id', __('Invalid invoice ID.', 'invoicing'));
         }
         return 0;
     }
 
-    $invoice = wpinv_get_invoice( $invoice_ID );
+    $invoice = wpinv_get_invoice($invoice_ID);
 
-    $recurring_item = $invoice->is_recurring() ? $invoice->get_recurring( true ) : NULL;
+    $recurring_item = $invoice->is_recurring() ? $invoice->get_recurring(true) : NULL;
 
-    if ( empty( $invoice->ID ) ) {
-        if ( $wp_error ) {
-            return new WP_Error( 'invalid_invoice', __( 'Invalid invoice.', 'invoicing' ) );
+    if (empty($invoice->ID)) {
+        if ($wp_error) {
+            return new WP_Error('invalid_invoice', __('Invalid invoice.', 'invoicing'));
         }
         return 0;
     }
 
-    if ( ! $invoice->has_status( array( 'wpi-pending' ) ) && ! $invoice->is_quote()  ) {
-        if ( $wp_error ) {
-            return new WP_Error( 'invalid_invoice_status', __( 'Only invoice with pending payment is allowed to update.', 'invoicing' ) );
+    if (!$invoice->has_status(array('wpi-pending')) && !$invoice->is_quote()) {
+        if ($wp_error) {
+            return new WP_Error('invalid_invoice_status', __('Only invoice with pending payment is allowed to update.', 'invoicing'));
         }
         return 0;
     }
 
     // Invoice status
-    if ( !empty( $invoice_data['status'] ) ) {
-        $invoice->set( 'status', $invoice_data['status'] );
+    if (!empty($invoice_data['status'])) {
+        $invoice->set('status', $invoice_data['status']);
     }
 
     // Invoice date
-    if ( !empty( $invoice_data['post_date'] ) ) {
-        $invoice->set( 'date', $invoice_data['post_date'] );
+    if (!empty($invoice_data['post_date'])) {
+        $invoice->set('date', $invoice_data['post_date']);
     }
 
     // Invoice due date
-    if ( isset( $invoice_data['due_date'] ) ) {
-        $invoice->set( 'due_date', $invoice_data['due_date'] );
+    if (isset($invoice_data['due_date'])) {
+        $invoice->set('due_date', $invoice_data['due_date']);
     }
 
     // Invoice IP address
-    if ( !empty( $invoice_data['ip'] ) ) {
-        $invoice->set( 'ip', $invoice_data['ip'] );
+    if (!empty($invoice_data['ip'])) {
+        $invoice->set('ip', $invoice_data['ip']);
     }
     
     // User info
-    if ( !empty( $invoice_data['user_info'] ) && is_array( $invoice_data['user_info'] ) ) {
-        $user_info = wp_parse_args( $invoice_data['user_info'], $invoice->user_info );
+    if (!empty($invoice_data['user_info']) && is_array($invoice_data['user_info'])) {
+        $user_info = wp_parse_args($invoice_data['user_info'], $invoice->user_info);
 
-        if ( $discounts = $invoice->get_discounts() ) {
+        if ($discounts = $invoice->get_discounts()) {
             $set_discount = $discounts;
         } else {
             $set_discount = '';
         }
 
         // Manage discount
-        if ( !empty( $invoice_data['user_info']['discount'] ) ) {
+        if (!empty($invoice_data['user_info']['discount'])) {
             // Remove discount
-            if ( $invoice_data['user_info']['discount'] == 'none' ) {
+            if ($invoice_data['user_info']['discount'] == 'none') {
                 $set_discount = '';
             } else {
                 $set_discount = $invoice_data['user_info']['discount'];
             }
 
-            $invoice->set( 'discounts', $set_discount );
+            $invoice->set('discounts', $set_discount);
         }
 
         $user_info['discount'] = $set_discount;
 
-        $invoice->set( 'user_info', $user_info );
+        $invoice->set('user_info', $user_info);
     }
 
-    if ( !empty( $invoice_data['cart_details'] ) && is_array( $invoice_data['cart_details'] ) && $cart_details = $invoice_data['cart_details'] ) {
-        $remove_items = !empty( $cart_details['remove_items'] ) && is_array( $cart_details['remove_items'] ) ? $cart_details['remove_items'] : array();
+    if (!empty($invoice_data['cart_details']) && is_array($invoice_data['cart_details']) && $cart_details = $invoice_data['cart_details']) {
+        $remove_items = !empty($cart_details['remove_items']) && is_array($cart_details['remove_items']) ? $cart_details['remove_items'] : array();
 
-        if ( !empty( $remove_items[0]['id'] ) ) {
-            foreach ( $remove_items as $item ) {
-                $item_id        = !empty( $item['id'] ) ? $item['id'] : 0;
-                $quantity       = !empty( $item['quantity'] ) ? $item['quantity'] : 1;
-                if ( empty( $item_id ) ) {
+        if (!empty($remove_items[0]['id'])) {
+            foreach ($remove_items as $item) {
+                $item_id        = !empty($item['id']) ? $item['id'] : 0;
+                $quantity       = !empty($item['quantity']) ? $item['quantity'] : 1;
+                if (empty($item_id)) {
                     continue;
                 }
 
-                foreach ( $invoice->cart_details as $cart_index => $cart_item ) {
-                    if ( $item_id == $cart_item['id'] ) {
+                foreach ($invoice->cart_details as $cart_index => $cart_item) {
+                    if ($item_id == $cart_item['id']) {
                         $args = array(
                             'id'         => $item_id,
                             'quantity'   => $quantity,
                             'cart_index' => $cart_index
                         );
 
-                        $invoice->remove_item( $item_id, $args );
+                        $invoice->remove_item($item_id, $args);
                         break;
                     }
                 }
             }
         }
 
-        $add_items = !empty( $cart_details['add_items'] ) && is_array( $cart_details['add_items'] ) ? $cart_details['add_items'] : array();
+        $add_items = !empty($cart_details['add_items']) && is_array($cart_details['add_items']) ? $cart_details['add_items'] : array();
 
-        if ( !empty( $add_items[0]['id'] ) ) {
-            foreach ( $add_items as $item ) {
-                $item_id        = !empty( $item['id'] ) ? $item['id'] : 0;
-                $post_item      = new WPInv_Item( $item_id );
-                if ( empty( $post_item ) ) {
+        if (!empty($add_items[0]['id'])) {
+            foreach ($add_items as $item) {
+                $item_id        = !empty($item['id']) ? $item['id'] : 0;
+                $post_item      = new WPInv_Item($item_id);
+                if (empty($post_item)) {
                     continue;
                 }
 
                 $valid_item = true;
-                if ( !empty( $recurring_item ) ) {
-                    if ( $recurring_item->ID != $item_id ) {
+                if (!empty($recurring_item)) {
+                    if ($recurring_item->ID != $item_id) {
                         $valid_item = false;
                     }
-                } else if ( wpinv_is_recurring_item( $item_id ) ) {
+                } else if (wpinv_is_recurring_item($item_id)) {
                     $valid_item = false;
                 }
                 
-                if ( !$valid_item ) {
-                    if ( $wp_error ) {
-                        return new WP_Error( 'invalid_invoice_item', __( 'You can not add item because recurring item must be paid individually!', 'invoicing' ) );
+                if (!$valid_item) {
+                    if ($wp_error) {
+                        return new WP_Error('invalid_invoice_item', __('You can not add item because recurring item must be paid individually!', 'invoicing'));
                     }
                     return 0;
                 }
 
-                $quantity       = !empty( $item['quantity'] ) ? $item['quantity'] : 1;
-                $name           = !empty( $item['name'] ) ? $item['name'] : $post_item->get_name();
-                $item_price     = isset( $item['item_price'] ) ? $item['item_price'] : $post_item->get_price();
+                $quantity       = !empty($item['quantity']) ? $item['quantity'] : 1;
+                $name           = !empty($item['name']) ? $item['name'] : $post_item->get_name();
+                $item_price     = isset($item['item_price']) ? $item['item_price'] : $post_item->get_price();
 
                 $args = array(
                     'name'          => $name,
                     'quantity'      => $quantity,
                     'item_price'    => $item_price,
-                    'custom_price'  => isset( $item['custom_price'] ) ? $item['custom_price'] : '',
-                    'tax'           => !empty( $item['tax'] ) ? $item['tax'] : 0,
-                    'discount'      => isset( $item['discount'] ) ? $item['discount'] : 0,
-                    'meta'          => isset( $item['meta'] ) ? $item['meta'] : array(),
-                    'fees'          => isset( $item['fees'] ) ? $item['fees'] : array(),
+                    'custom_price'  => isset($item['custom_price']) ? $item['custom_price'] : '',
+                    'tax'           => !empty($item['tax']) ? $item['tax'] : 0,
+                    'discount'      => isset($item['discount']) ? $item['discount'] : 0,
+                    'meta'          => isset($item['meta']) ? $item['meta'] : array(),
+                    'fees'          => isset($item['fees']) ? $item['fees'] : array(),
                 );
 
-                $invoice->add_item( $item_id, $args );
+                $invoice->add_item($item_id, $args);
             }
         }
     }
     
     // Payment details
-    if ( !empty( $invoice_data['payment_details'] ) && $payment_details = $invoice_data['payment_details'] ) {
-        if ( !empty( $payment_details['gateway'] ) ) {
-            $invoice->set( 'gateway', $payment_details['gateway'] );
+    if (!empty($invoice_data['payment_details']) && $payment_details = $invoice_data['payment_details']) {
+        if (!empty($payment_details['gateway'])) {
+            $invoice->set('gateway', $payment_details['gateway']);
         }
 
-        if ( !empty( $payment_details['transaction_id'] ) ) {
-            $invoice->set( 'transaction_id', $payment_details['transaction_id'] );
+        if (!empty($payment_details['transaction_id'])) {
+            $invoice->set('transaction_id', $payment_details['transaction_id']);
         }
     }
 
-    do_action( 'wpinv_pre_update_invoice', $invoice->ID, $invoice_data );
+    do_action('wpinv_pre_update_invoice', $invoice->ID, $invoice_data);
 
     // Parent invoice
-    if ( !empty( $invoice_data['parent'] ) ) {
-        $invoice->set( 'parent_invoice', $invoice_data['parent'] );
+    if (!empty($invoice_data['parent'])) {
+        $invoice->set('parent_invoice', $invoice_data['parent']);
     }
 
     // Save invoice data.
     $invoice->save();
     
-    if ( empty( $invoice->ID ) || is_wp_error( $invoice ) ) {
-        if ( $wp_error ) {
-            if ( is_wp_error( $invoice ) ) {
+    if (empty($invoice->ID) || is_wp_error($invoice)) {
+        if ($wp_error) {
+            if (is_wp_error($invoice)) {
                 return $invoice;
             } else {
-                return new WP_Error( 'wpinv_update_invoice_error', __( 'Error in update invoice.', 'invoicing' ) );
+                return new WP_Error('wpinv_update_invoice_error', __('Error in update invoice.', 'invoicing'));
             }
         } else {
             return 0;
@@ -454,19 +454,19 @@ 
     }
 
     // Add private note
-    if ( !empty( $invoice_data['private_note'] ) ) {
-        $invoice->add_note( $invoice_data['private_note'] );
+    if (!empty($invoice_data['private_note'])) {
+        $invoice->add_note($invoice_data['private_note']);
     }
 
     // Add user note
-    if ( !empty( $invoice_data['user_note'] ) ) {
-        $invoice->add_note( $invoice_data['user_note'], true );
+    if (!empty($invoice_data['user_note'])) {
+        $invoice->add_note($invoice_data['user_note'], true);
     }
 
-    if ( $invoice->is_quote() ) {
+    if ($invoice->is_quote()) {
 
-        if ( isset( $invoice_data['valid_until'] ) ) {
-            update_post_meta( $invoice->ID, 'wpinv_quote_valid_until', $invoice_data['valid_until'] );
+        if (isset($invoice_data['valid_until'])) {
+            update_post_meta($invoice->ID, 'wpinv_quote_valid_until', $invoice_data['valid_until']);
         }
         return $invoice;
 
@@ -478,450 +478,450 @@ 
 
     $data_session                   = array();
     $data_session['invoice_id']     = $invoice->ID;
-    $data_session['cart_discounts'] = $invoice->get_discounts( true );
+    $data_session['cart_discounts'] = $invoice->get_discounts(true);
 
-    wpinv_set_checkout_session( $data_session );
+    wpinv_set_checkout_session($data_session);
 
-    $wpi_userID         = (int)$invoice->get_user_id();
+    $wpi_userID         = (int) $invoice->get_user_id();
 
-    $_POST['country']   = !empty( $invoice->country ) ? $invoice->country : wpinv_get_default_country();
+    $_POST['country']   = !empty($invoice->country) ? $invoice->country : wpinv_get_default_country();
     $_POST['state']     = $invoice->state;
 
-    $invoice->set( 'country', sanitize_text_field( $_POST['country'] ) );
-    $invoice->set( 'state', sanitize_text_field( $_POST['state'] ) );
+    $invoice->set('country', sanitize_text_field($_POST['country']));
+    $invoice->set('state', sanitize_text_field($_POST['state']));
 
     $wpinv_ip_address_country = $invoice->country;
 
-    $invoice = $invoice->recalculate_totals( true );
+    $invoice = $invoice->recalculate_totals(true);
 
-    do_action( 'wpinv_post_update_invoice', $invoice->ID, $invoice_data );
+    do_action('wpinv_post_update_invoice', $invoice->ID, $invoice_data);
 
-    wpinv_set_checkout_session( $checkout_session );
+    wpinv_set_checkout_session($checkout_session);
 
     return $invoice;
 }
 
-function wpinv_get_invoice( $invoice_id = 0, $cart = false ) {
-    if ( $cart && empty( $invoice_id ) ) {
-        $invoice_id = (int)wpinv_get_invoice_cart_id();
+function wpinv_get_invoice($invoice_id = 0, $cart = false) {
+    if ($cart && empty($invoice_id)) {
+        $invoice_id = (int) wpinv_get_invoice_cart_id();
     }
 
-    $invoice = new WPInv_Invoice( $invoice_id );
+    $invoice = new WPInv_Invoice($invoice_id);
 
-    if ( ! empty( $invoice ) && ! empty( $invoice->ID ) ) {
+    if (!empty($invoice) && !empty($invoice->ID)) {
         return $invoice;
     }
     
     return NULL;
 }
 
-function wpinv_get_invoice_cart( $invoice_id = 0 ) {
-    return wpinv_get_invoice( $invoice_id, true );
+function wpinv_get_invoice_cart($invoice_id = 0) {
+    return wpinv_get_invoice($invoice_id, true);
 }
 
-function wpinv_get_invoice_description( $invoice_id = 0 ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_get_invoice_description($invoice_id = 0) {
+    $invoice = new WPInv_Invoice($invoice_id);
     return $invoice->get_description();
 }
 
-function wpinv_get_invoice_currency_code( $invoice_id = 0 ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_get_invoice_currency_code($invoice_id = 0) {
+    $invoice = new WPInv_Invoice($invoice_id);
     return $invoice->get_currency();
 }
 
-function wpinv_get_payment_user_email( $invoice_id ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_get_payment_user_email($invoice_id) {
+    $invoice = new WPInv_Invoice($invoice_id);
     return $invoice->get_email();
 }
 
-function wpinv_get_user_id( $invoice_id ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_get_user_id($invoice_id) {
+    $invoice = new WPInv_Invoice($invoice_id);
     return $invoice->get_user_id();
 }
 
-function wpinv_get_invoice_status( $invoice_id, $return_label = false ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_get_invoice_status($invoice_id, $return_label = false) {
+    $invoice = new WPInv_Invoice($invoice_id);
     
-    return $invoice->get_status( $return_label );
+    return $invoice->get_status($return_label);
 }
 
-function wpinv_get_payment_gateway( $invoice_id, $return_label = false ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_get_payment_gateway($invoice_id, $return_label = false) {
+    $invoice = new WPInv_Invoice($invoice_id);
     
-    return $invoice->get_gateway( $return_label );
+    return $invoice->get_gateway($return_label);
 }
 
-function wpinv_get_payment_gateway_name( $invoice_id ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_get_payment_gateway_name($invoice_id) {
+    $invoice = new WPInv_Invoice($invoice_id);
     
     return $invoice->get_gateway_title();
 }
 
-function wpinv_get_payment_transaction_id( $invoice_id ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_get_payment_transaction_id($invoice_id) {
+    $invoice = new WPInv_Invoice($invoice_id);
     
     return $invoice->get_transaction_id();
 }
 
-function wpinv_get_id_by_transaction_id( $key ) {
+function wpinv_get_id_by_transaction_id($key) {
     global $wpdb;
 
-    $invoice_id = $wpdb->get_var( $wpdb->prepare( "SELECT post_id FROM $wpdb->postmeta WHERE meta_key = '_wpinv_transaction_id' AND meta_value = %s LIMIT 1", $key ) );
+    $invoice_id = $wpdb->get_var($wpdb->prepare("SELECT post_id FROM $wpdb->postmeta WHERE meta_key = '_wpinv_transaction_id' AND meta_value = %s LIMIT 1", $key));
 
-    if ( $invoice_id != NULL )
+    if ($invoice_id != NULL)
         return $invoice_id;
 
     return 0;
 }
 
-function wpinv_get_invoice_meta( $invoice_id = 0, $meta_key = '_wpinv_payment_meta', $single = true ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_get_invoice_meta($invoice_id = 0, $meta_key = '_wpinv_payment_meta', $single = true) {
+    $invoice = new WPInv_Invoice($invoice_id);
 
-    return $invoice->get_meta( $meta_key, $single );
+    return $invoice->get_meta($meta_key, $single);
 }
 
-function wpinv_update_invoice_meta( $invoice_id = 0, $meta_key = '', $meta_value = '', $prev_value = '' ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_update_invoice_meta($invoice_id = 0, $meta_key = '', $meta_value = '', $prev_value = '') {
+    $invoice = new WPInv_Invoice($invoice_id);
     
-    return $invoice->update_meta( $meta_key, $meta_value, $prev_value );
+    return $invoice->update_meta($meta_key, $meta_value, $prev_value);
 }
 
-function wpinv_get_items( $invoice_id = 0 ) {
-    $invoice            = wpinv_get_invoice( $invoice_id );
+function wpinv_get_items($invoice_id = 0) {
+    $invoice            = wpinv_get_invoice($invoice_id);
     
     $items              = $invoice->get_items();
     $invoice_currency   = $invoice->get_currency();
 
-    if ( !empty( $items ) && is_array( $items ) ) {
-        foreach ( $items as $key => $item ) {
+    if (!empty($items) && is_array($items)) {
+        foreach ($items as $key => $item) {
             $items[$key]['currency'] = $invoice_currency;
 
-            if ( !isset( $item['subtotal'] ) ) {
+            if (!isset($item['subtotal'])) {
                 $items[$key]['subtotal'] = $items[$key]['amount'] * 1;
             }
         }
     }
 
-    return apply_filters( 'wpinv_get_items', $items, $invoice_id );
+    return apply_filters('wpinv_get_items', $items, $invoice_id);
 }
 
-function wpinv_get_fees( $invoice_id = 0 ) {
-    $invoice           = wpinv_get_invoice( $invoice_id );
+function wpinv_get_fees($invoice_id = 0) {
+    $invoice           = wpinv_get_invoice($invoice_id);
     $fees              = $invoice->get_fees();
 
-    return apply_filters( 'wpinv_get_fees', $fees, $invoice_id );
+    return apply_filters('wpinv_get_fees', $fees, $invoice_id);
 }
 
-function wpinv_get_invoice_ip( $invoice_id ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_get_invoice_ip($invoice_id) {
+    $invoice = new WPInv_Invoice($invoice_id);
     return $invoice->get_ip();
 }
 
-function wpinv_get_invoice_user_info( $invoice_id ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_get_invoice_user_info($invoice_id) {
+    $invoice = new WPInv_Invoice($invoice_id);
     return $invoice->get_user_info();
 }
 
-function wpinv_subtotal( $invoice_id = 0, $currency = false ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_subtotal($invoice_id = 0, $currency = false) {
+    $invoice = new WPInv_Invoice($invoice_id);
 
-    return $invoice->get_subtotal( $currency );
+    return $invoice->get_subtotal($currency);
 }
 
-function wpinv_tax( $invoice_id = 0, $currency = false ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_tax($invoice_id = 0, $currency = false) {
+    $invoice = new WPInv_Invoice($invoice_id);
 
-    return $invoice->get_tax( $currency );
+    return $invoice->get_tax($currency);
 }
 
-function wpinv_discount( $invoice_id = 0, $currency = false, $dash = false ) {
-    $invoice = wpinv_get_invoice( $invoice_id );
+function wpinv_discount($invoice_id = 0, $currency = false, $dash = false) {
+    $invoice = wpinv_get_invoice($invoice_id);
 
-    return $invoice->get_discount( $currency, $dash );
+    return $invoice->get_discount($currency, $dash);
 }
 
-function wpinv_discount_code( $invoice_id = 0 ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_discount_code($invoice_id = 0) {
+    $invoice = new WPInv_Invoice($invoice_id);
 
     return $invoice->get_discount_code();
 }
 
-function wpinv_payment_total( $invoice_id = 0, $currency = false ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_payment_total($invoice_id = 0, $currency = false) {
+    $invoice = new WPInv_Invoice($invoice_id);
 
-    return $invoice->get_total( $currency );
+    return $invoice->get_total($currency);
 }
 
-function wpinv_get_date_created( $invoice_id = 0, $format = '' ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_get_date_created($invoice_id = 0, $format = '') {
+    $invoice = new WPInv_Invoice($invoice_id);
 
-    $format         = !empty( $format ) ? $format : get_option( 'date_format' );
+    $format         = !empty($format) ? $format : get_option('date_format');
     $date_created   = $invoice->get_created_date();
-    $date_created   = $date_created != '' && $date_created != '0000-00-00 00:00:00' ? date_i18n( $format, strtotime( $date_created ) ) : '';
+    $date_created   = $date_created != '' && $date_created != '0000-00-00 00:00:00' ? date_i18n($format, strtotime($date_created)) : '';
 
     return $date_created;
 }
 
-function wpinv_get_invoice_date( $invoice_id = 0, $format = '', $default = true ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_get_invoice_date($invoice_id = 0, $format = '', $default = true) {
+    $invoice = new WPInv_Invoice($invoice_id);
     
-    $format         = !empty( $format ) ? $format : get_option( 'date_format' );
+    $format         = !empty($format) ? $format : get_option('date_format');
     $date_completed = $invoice->get_completed_date();
-    $invoice_date   = $date_completed != '' && $date_completed != '0000-00-00 00:00:00' ? date_i18n( $format, strtotime( $date_completed ) ) : '';
-    if ( $invoice_date == '' && $default ) {
-        $invoice_date   = wpinv_get_date_created( $invoice_id, $format );
+    $invoice_date   = $date_completed != '' && $date_completed != '0000-00-00 00:00:00' ? date_i18n($format, strtotime($date_completed)) : '';
+    if ($invoice_date == '' && $default) {
+        $invoice_date = wpinv_get_date_created($invoice_id, $format);
     }
 
     return $invoice_date;
 }
 
-function wpinv_get_invoice_vat_number( $invoice_id = 0 ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_get_invoice_vat_number($invoice_id = 0) {
+    $invoice = new WPInv_Invoice($invoice_id);
     
     return $invoice->vat_number;
 }
 
-function wpinv_insert_payment_note( $invoice_id = 0, $note = '', $user_type = false, $added_by_user = false, $system = false ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_insert_payment_note($invoice_id = 0, $note = '', $user_type = false, $added_by_user = false, $system = false) {
+    $invoice = new WPInv_Invoice($invoice_id);
 
-    return $invoice->add_note( $note, $user_type, $added_by_user, $system );
+    return $invoice->add_note($note, $user_type, $added_by_user, $system);
 }
 
-function wpinv_get_invoice_notes( $invoice_id = 0, $type = '' ) {
+function wpinv_get_invoice_notes($invoice_id = 0, $type = '') {
     global $invoicing;
     
-    if ( empty( $invoice_id ) ) {
+    if (empty($invoice_id)) {
         return NULL;
     }
     
-    $notes = $invoicing->notes->get_invoice_notes( $invoice_id, $type );
+    $notes = $invoicing->notes->get_invoice_notes($invoice_id, $type);
     
-    return apply_filters( 'wpinv_invoice_notes', $notes, $invoice_id, $type );
+    return apply_filters('wpinv_invoice_notes', $notes, $invoice_id, $type);
 }
 
-function wpinv_get_payment_key( $invoice_id = 0 ) {
-	$invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_get_payment_key($invoice_id = 0) {
+	$invoice = new WPInv_Invoice($invoice_id);
     return $invoice->get_key();
 }
 
-function wpinv_get_invoice_number( $invoice_id = 0 ) {
-    $invoice = new WPInv_Invoice( $invoice_id );
+function wpinv_get_invoice_number($invoice_id = 0) {
+    $invoice = new WPInv_Invoice($invoice_id);
     return $invoice->get_number();
 }
 
-function wpinv_get_cart_discountable_subtotal( $code_id ) {
+function wpinv_get_cart_discountable_subtotal($code_id) {
     $cart_items = wpinv_get_cart_content_details();
     $items      = array();
 
-    $excluded_items = wpinv_get_discount_excluded_items( $code_id );
+    $excluded_items = wpinv_get_discount_excluded_items($code_id);
 
-    if( $cart_items ) {
+    if ($cart_items) {
 
-        foreach( $cart_items as $item ) {
+        foreach ($cart_items as $item) {
 
-            if( ! in_array( $item['id'], $excluded_items ) ) {
-                $items[] =  $item;
+            if (!in_array($item['id'], $excluded_items)) {
+                $items[] = $item;
             }
         }
     }
 
-    $subtotal = wpinv_get_cart_items_subtotal( $items );
+    $subtotal = wpinv_get_cart_items_subtotal($items);
 
-    return apply_filters( 'wpinv_get_cart_discountable_subtotal', $subtotal );
+    return apply_filters('wpinv_get_cart_discountable_subtotal', $subtotal);
 }
 
-function wpinv_get_cart_items_subtotal( $items ) {
+function wpinv_get_cart_items_subtotal($items) {
     $subtotal = 0.00;
 
-    if ( is_array( $items ) && ! empty( $items ) ) {
-        $prices = wp_list_pluck( $items, 'subtotal' );
+    if (is_array($items) && !empty($items)) {
+        $prices = wp_list_pluck($items, 'subtotal');
 
-        if( is_array( $prices ) ) {
-            $subtotal = array_sum( $prices );
+        if (is_array($prices)) {
+            $subtotal = array_sum($prices);
         } else {
             $subtotal = 0.00;
         }
 
-        if( $subtotal < 0 ) {
+        if ($subtotal < 0) {
             $subtotal = 0.00;
         }
     }
 
-    return apply_filters( 'wpinv_get_cart_items_subtotal', $subtotal );
+    return apply_filters('wpinv_get_cart_items_subtotal', $subtotal);
 }
 
-function wpinv_get_cart_subtotal( $items = array() ) {
-    $items    = !empty( $items ) ? $items : wpinv_get_cart_content_details();
-    $subtotal = wpinv_get_cart_items_subtotal( $items );
+function wpinv_get_cart_subtotal($items = array()) {
+    $items    = !empty($items) ? $items : wpinv_get_cart_content_details();
+    $subtotal = wpinv_get_cart_items_subtotal($items);
 
-    return apply_filters( 'wpinv_get_cart_subtotal', $subtotal );
+    return apply_filters('wpinv_get_cart_subtotal', $subtotal);
 }
 
-function wpinv_cart_subtotal( $items = array() ) {
-    $price = wpinv_price( wpinv_format_amount( wpinv_get_cart_subtotal( $items ) ) );
+function wpinv_cart_subtotal($items = array()) {
+    $price = wpinv_price(wpinv_format_amount(wpinv_get_cart_subtotal($items)));
 
     return $price;
 }
 
-function wpinv_get_cart_total( $items = array(), $discounts = false, $invoice = array() ) {
-    $subtotal  = (float)wpinv_get_cart_subtotal( $items );
-    $discounts = (float)wpinv_get_cart_discounted_amount( $items );
-    $cart_tax  = (float)wpinv_get_cart_tax( $items );
-    $fees      = (float)wpinv_get_cart_fee_total();
-    if ( !empty( $invoice ) && $invoice->is_free_trial() ) {
+function wpinv_get_cart_total($items = array(), $discounts = false, $invoice = array()) {
+    $subtotal  = (float) wpinv_get_cart_subtotal($items);
+    $discounts = (float) wpinv_get_cart_discounted_amount($items);
+    $cart_tax  = (float) wpinv_get_cart_tax($items);
+    $fees      = (float) wpinv_get_cart_fee_total();
+    if (!empty($invoice) && $invoice->is_free_trial()) {
         $total = 0;
     } else {
-        $total     = $subtotal - $discounts + $cart_tax + $fees;
+        $total = $subtotal - $discounts + $cart_tax + $fees;
     }
 
-    if ( $total < 0 ) {
+    if ($total < 0) {
         $total = 0.00;
     }
     
-    $total = (float)apply_filters( 'wpinv_get_cart_total', $total, $items );
+    $total = (float) apply_filters('wpinv_get_cart_total', $total, $items);
 
-    return wpinv_sanitize_amount( $total );
+    return wpinv_sanitize_amount($total);
 }
 
-function wpinv_cart_total( $cart_items = array(), $echo = true, $invoice = array() ) {
+function wpinv_cart_total($cart_items = array(), $echo = true, $invoice = array()) {
     global $cart_total;
-    $total = wpinv_price( wpinv_format_amount( wpinv_get_cart_total( $cart_items, NULL, $invoice ) ) );
-    $total = apply_filters( 'wpinv_cart_total', $total, $cart_items, $invoice );
+    $total = wpinv_price(wpinv_format_amount(wpinv_get_cart_total($cart_items, NULL, $invoice)));
+    $total = apply_filters('wpinv_cart_total', $total, $cart_items, $invoice);
     
     $cart_total = $total;
 
-    if ( !$echo ) {
+    if (!$echo) {
         return $total;
     }
 
     echo $total;
 }
 
-function wpinv_get_cart_tax( $items = array() ) {
+function wpinv_get_cart_tax($items = array()) {
     $cart_tax = 0;
-    $items    = !empty( $items ) ? $items : wpinv_get_cart_content_details();
+    $items    = !empty($items) ? $items : wpinv_get_cart_content_details();
 
-    if ( $items ) {
-        $taxes = wp_list_pluck( $items, 'tax' );
+    if ($items) {
+        $taxes = wp_list_pluck($items, 'tax');
 
-        if( is_array( $taxes ) ) {
-            $cart_tax = array_sum( $taxes );
+        if (is_array($taxes)) {
+            $cart_tax = array_sum($taxes);
         }
     }
 
     $cart_tax += wpinv_get_cart_fee_tax();
 
-    return apply_filters( 'wpinv_get_cart_tax', wpinv_sanitize_amount( $cart_tax ) );
+    return apply_filters('wpinv_get_cart_tax', wpinv_sanitize_amount($cart_tax));
 }
 
-function wpinv_cart_tax( $items = array(), $echo = false ) {
-    $cart_tax = wpinv_get_cart_tax( $items );
-    $cart_tax = wpinv_price( wpinv_format_amount( $cart_tax ) );
+function wpinv_cart_tax($items = array(), $echo = false) {
+    $cart_tax = wpinv_get_cart_tax($items);
+    $cart_tax = wpinv_price(wpinv_format_amount($cart_tax));
 
-    $tax = apply_filters( 'wpinv_cart_tax', $cart_tax, $items );
+    $tax = apply_filters('wpinv_cart_tax', $cart_tax, $items);
 
-    if ( !$echo ) {
+    if (!$echo) {
         return $tax;
     }
 
     echo $tax;
 }
 
-function wpinv_get_cart_discount_code( $items = array() ) {
+function wpinv_get_cart_discount_code($items = array()) {
     $invoice = wpinv_get_invoice_cart();
-    $cart_discount_code = !empty( $invoice ) ? $invoice->get_discount_code() : '';
+    $cart_discount_code = !empty($invoice) ? $invoice->get_discount_code() : '';
     
-    return apply_filters( 'wpinv_get_cart_discount_code', $cart_discount_code );
+    return apply_filters('wpinv_get_cart_discount_code', $cart_discount_code);
 }
 
-function wpinv_cart_discount_code( $items = array(), $echo = false ) {
-    $cart_discount_code = wpinv_get_cart_discount_code( $items );
+function wpinv_cart_discount_code($items = array(), $echo = false) {
+    $cart_discount_code = wpinv_get_cart_discount_code($items);
 
-    if ( $cart_discount_code != '' ) {
+    if ($cart_discount_code != '') {
         $cart_discount_code = ' (' . $cart_discount_code . ')';
     }
     
-    $discount_code = apply_filters( 'wpinv_cart_discount_code', $cart_discount_code, $items );
+    $discount_code = apply_filters('wpinv_cart_discount_code', $cart_discount_code, $items);
 
-    if ( !$echo ) {
+    if (!$echo) {
         return $discount_code;
     }
 
     echo $discount_code;
 }
 
-function wpinv_get_cart_discount( $items = array() ) {
+function wpinv_get_cart_discount($items = array()) {
     $invoice = wpinv_get_invoice_cart();
-    $cart_discount = !empty( $invoice ) ? $invoice->get_discount() : 0;
+    $cart_discount = !empty($invoice) ? $invoice->get_discount() : 0;
     
-    return apply_filters( 'wpinv_get_cart_discount', wpinv_sanitize_amount( $cart_discount ), $items );
+    return apply_filters('wpinv_get_cart_discount', wpinv_sanitize_amount($cart_discount), $items);
 }
 
-function wpinv_cart_discount( $items = array(), $echo = false ) {
-    $cart_discount = wpinv_get_cart_discount( $items );
-    $cart_discount = wpinv_price( wpinv_format_amount( $cart_discount ) );
+function wpinv_cart_discount($items = array(), $echo = false) {
+    $cart_discount = wpinv_get_cart_discount($items);
+    $cart_discount = wpinv_price(wpinv_format_amount($cart_discount));
 
-    $discount = apply_filters( 'wpinv_cart_discount', $cart_discount, $items );
+    $discount = apply_filters('wpinv_cart_discount', $cart_discount, $items);
 
-    if ( !$echo ) {
+    if (!$echo) {
         return $discount;
     }
 
     echo $discount;
 }
 
-function wpinv_get_cart_fees( $type = 'all', $item_id = 0 ) {
-    $item = new WPInv_Item( $item_id );
+function wpinv_get_cart_fees($type = 'all', $item_id = 0) {
+    $item = new WPInv_Item($item_id);
     
-    return $item->get_fees( $type, $item_id );
+    return $item->get_fees($type, $item_id);
 }
 
 function wpinv_get_cart_fee_total() {
-    $total  = 0;
+    $total = 0;
     $fees = wpinv_get_cart_fees();
     
-    if ( $fees ) {
-        foreach ( $fees as $fee_id => $fee ) {
+    if ($fees) {
+        foreach ($fees as $fee_id => $fee) {
             $total += $fee['amount'];
         }
     }
 
-    return apply_filters( 'wpinv_get_cart_fee_total', $total );
+    return apply_filters('wpinv_get_cart_fee_total', $total);
 }
 
 function wpinv_get_cart_fee_tax() {
     $tax  = 0;
     $fees = wpinv_get_cart_fees();
 
-    if ( $fees ) {
-        foreach ( $fees as $fee_id => $fee ) {
-            if( ! empty( $fee['no_tax'] ) ) {
+    if ($fees) {
+        foreach ($fees as $fee_id => $fee) {
+            if (!empty($fee['no_tax'])) {
                 continue;
             }
 
-            $tax += wpinv_calculate_tax( $fee['amount'] );
+            $tax += wpinv_calculate_tax($fee['amount']);
         }
     }
 
-    return apply_filters( 'wpinv_get_cart_fee_tax', $tax );
+    return apply_filters('wpinv_get_cart_fee_tax', $tax);
 }
 
 function wpinv_cart_has_recurring_item() {
     $cart_items = wpinv_get_cart_contents();
     
-    if ( empty( $cart_items ) ) {
+    if (empty($cart_items)) {
         return false;
     }
     
     $has_subscription = false;
-    foreach( $cart_items as $cart_item ) {
-        if ( !empty( $cart_item['id'] ) && wpinv_is_recurring_item( $cart_item['id'] )  ) {
+    foreach ($cart_items as $cart_item) {
+        if (!empty($cart_item['id']) && wpinv_is_recurring_item($cart_item['id'])) {
             $has_subscription = true;
             break;
         }
     }
     
-    return apply_filters( 'wpinv_cart_has_recurring_item', $has_subscription, $cart_items );
+    return apply_filters('wpinv_cart_has_recurring_item', $has_subscription, $cart_items);
 }
 
 function wpinv_cart_has_free_trial() {
@@ -929,97 +929,97 @@ 
     
     $free_trial = false;
     
-    if ( !empty( $invoice ) && $invoice->is_free_trial() ) {
+    if (!empty($invoice) && $invoice->is_free_trial()) {
         $free_trial = true;
     }
     
-    return apply_filters( 'wpinv_cart_has_free_trial', $free_trial, $invoice );
+    return apply_filters('wpinv_cart_has_free_trial', $free_trial, $invoice);
 }
 
 function wpinv_get_cart_contents() {
     $cart_details = wpinv_get_cart_details();
     
-    return apply_filters( 'wpinv_get_cart_contents', $cart_details );
+    return apply_filters('wpinv_get_cart_contents', $cart_details);
 }
 
 function wpinv_get_cart_content_details() {
     global $wpinv_euvat, $wpi_current_id, $wpi_item_id, $wpinv_is_last_cart_item, $wpinv_flat_discount_total;
     $cart_items = wpinv_get_cart_contents();
     
-    if ( empty( $cart_items ) ) {
+    if (empty($cart_items)) {
         return false;
     }
     $invoice = wpinv_get_invoice_cart();
-	if ( empty( $invoice ) ) {
+	if (empty($invoice)) {
         return false;
     }
 
     $details = array();
-    $length  = count( $cart_items ) - 1;
+    $length  = count($cart_items) - 1;
     
-    if ( empty( $_POST['country'] ) ) {
+    if (empty($_POST['country'])) {
         $_POST['country'] = $invoice->country;
     }
-    if ( !isset( $_POST['state'] ) ) {
+    if (!isset($_POST['state'])) {
         $_POST['state'] = $invoice->state;
     }
 
-    foreach( $cart_items as $key => $item ) {
-        $item_id            = isset( $item['id'] ) ? sanitize_text_field( $item['id'] ) : '';
-        if ( empty( $item_id ) ) {
+    foreach ($cart_items as $key => $item) {
+        $item_id = isset($item['id']) ? sanitize_text_field($item['id']) : '';
+        if (empty($item_id)) {
             continue;
         }
         
         $wpi_current_id         = $invoice->ID;
         $wpi_item_id            = $item_id;
         
-        if ( isset( $item['custom_price'] ) && $item['custom_price'] !== '' ) {
+        if (isset($item['custom_price']) && $item['custom_price'] !== '') {
             $item_price = $item['custom_price'];
         } else {
-            if ( isset( $item['item_price'] ) && $item['item_price'] !== '' && $item['item_price'] !== false ) {
+            if (isset($item['item_price']) && $item['item_price'] !== '' && $item['item_price'] !== false) {
                 $item_price = $item['item_price'];
             } else {
-                $item_price = wpinv_get_item_price( $item_id );
+                $item_price = wpinv_get_item_price($item_id);
             }
         }
-        $discount           = wpinv_get_cart_item_discount_amount( $item );
-        $discount           = apply_filters( 'wpinv_get_cart_content_details_item_discount_amount', $discount, $item );
-        $quantity           = wpinv_get_cart_item_quantity( $item );
-        $fees               = wpinv_get_cart_fees( 'fee', $item_id );
+        $discount           = wpinv_get_cart_item_discount_amount($item);
+        $discount           = apply_filters('wpinv_get_cart_content_details_item_discount_amount', $discount, $item);
+        $quantity           = wpinv_get_cart_item_quantity($item);
+        $fees               = wpinv_get_cart_fees('fee', $item_id);
         
         $subtotal           = $item_price * $quantity;
-        $tax_rate           = wpinv_get_tax_rate( $_POST['country'], $_POST['state'], $wpi_item_id );
-        $tax_class          = $wpinv_euvat->get_item_class( $item_id );
-        $tax                = wpinv_get_cart_item_tax( $item_id, $subtotal - $discount );
+        $tax_rate           = wpinv_get_tax_rate($_POST['country'], $_POST['state'], $wpi_item_id);
+        $tax_class          = $wpinv_euvat->get_item_class($item_id);
+        $tax                = wpinv_get_cart_item_tax($item_id, $subtotal - $discount);
         
-        if ( wpinv_prices_include_tax() ) {
-            $subtotal -= wpinv_round_amount( $tax );
+        if (wpinv_prices_include_tax()) {
+            $subtotal -= wpinv_round_amount($tax);
         }
         
-        $total              = $subtotal - $discount + $tax;
+        $total = $subtotal - $discount + $tax;
         
         // Do not allow totals to go negatve
-        if( $total < 0 ) {
+        if ($total < 0) {
             $total = 0;
         }
         
-        $details[ $key ]  = array(
+        $details[$key] = array(
             'id'                => $item_id,
-            'name'              => !empty($item['name']) ? $item['name'] : get_the_title( $item_id ),
-            'item_price'        => wpinv_round_amount( $item_price ),
-            'custom_price'      => isset( $item['custom_price'] ) ? $item['custom_price'] : '',
+            'name'              => !empty($item['name']) ? $item['name'] : get_the_title($item_id),
+            'item_price'        => wpinv_round_amount($item_price),
+            'custom_price'      => isset($item['custom_price']) ? $item['custom_price'] : '',
             'quantity'          => $quantity,
-            'discount'          => wpinv_round_amount( $discount ),
-            'subtotal'          => wpinv_round_amount( $subtotal ),
-            'tax'               => wpinv_round_amount( $tax ),
-            'price'             => wpinv_round_amount( $total ),
+            'discount'          => wpinv_round_amount($discount),
+            'subtotal'          => wpinv_round_amount($subtotal),
+            'tax'               => wpinv_round_amount($tax),
+            'price'             => wpinv_round_amount($total),
             'vat_rates_class'   => $tax_class,
             'vat_rate'          => $tax_rate,
-            'meta'              => isset( $item['meta'] ) ? $item['meta'] : array(),
+            'meta'              => isset($item['meta']) ? $item['meta'] : array(),
             'fees'              => $fees,
         );
         
-        if ( $wpinv_is_last_cart_item ) {
+        if ($wpinv_is_last_cart_item) {
             $wpinv_is_last_cart_item   = false;
             $wpinv_flat_discount_total = 0.00;
         }
@@ -1028,67 +1028,67 @@ 
     return $details;
 }
 
-function wpinv_get_cart_details( $invoice_id = 0 ) {
+function wpinv_get_cart_details($invoice_id = 0) {
     global $ajax_cart_details;
 
-    $invoice      = wpinv_get_invoice_cart( $invoice_id );
+    $invoice      = wpinv_get_invoice_cart($invoice_id);
     $cart_details = $ajax_cart_details;
-    if ( empty( $cart_details ) && ! empty( $invoice->cart_details ) ) {
+    if (empty($cart_details) && !empty($invoice->cart_details)) {
         $cart_details = $invoice->cart_details;
     }
 
-    if ( ! empty( $cart_details ) && is_array( $cart_details ) ) {
-        $invoice_currency = ! empty( $invoice->currency ) ? $invoice->currency : wpinv_get_default_country();
+    if (!empty($cart_details) && is_array($cart_details)) {
+        $invoice_currency = !empty($invoice->currency) ? $invoice->currency : wpinv_get_default_country();
 
-        foreach ( $cart_details as $key => $cart_item ) {
-            $cart_details[ $key ]['currency'] = $invoice_currency;
+        foreach ($cart_details as $key => $cart_item) {
+            $cart_details[$key]['currency'] = $invoice_currency;
 
-            if ( ! isset( $cart_item['subtotal'] ) ) {
-                $cart_details[ $key ]['subtotal'] = $cart_item['price'];
+            if (!isset($cart_item['subtotal'])) {
+                $cart_details[$key]['subtotal'] = $cart_item['price'];
             }
         }
     }
 
-    return apply_filters( 'wpinv_get_cart_details', $cart_details, $invoice_id );
+    return apply_filters('wpinv_get_cart_details', $cart_details, $invoice_id);
 }
 
-function wpinv_record_status_change( $invoice_id, $new_status, $old_status ) {
-    if ( 'wpi_invoice' != get_post_type( $invoice_id ) ) {
+function wpinv_record_status_change($invoice_id, $new_status, $old_status) {
+    if ('wpi_invoice' != get_post_type($invoice_id)) {
         return;
     }
 
-    if ( ( $old_status == 'wpi-pending' && $new_status == 'draft' ) || ( $old_status == 'draft' && $new_status == 'wpi-pending' ) ) {
+    if (($old_status == 'wpi-pending' && $new_status == 'draft') || ($old_status == 'draft' && $new_status == 'wpi-pending')) {
         return;
     }
 
-    $invoice    = wpinv_get_invoice( $invoice_id );
+    $invoice    = wpinv_get_invoice($invoice_id);
     
-    $old_status = wpinv_status_nicename( $old_status );
-    $new_status = wpinv_status_nicename( $new_status );
+    $old_status = wpinv_status_nicename($old_status);
+    $new_status = wpinv_status_nicename($new_status);
 
-    $status_change = sprintf( __( 'Invoice status changed from %s to %s', 'invoicing' ), $old_status, $new_status );
+    $status_change = sprintf(__('Invoice status changed from %s to %s', 'invoicing'), $old_status, $new_status);
     
     // Add note
-    return $invoice->add_note( $status_change, false, false, true );
+    return $invoice->add_note($status_change, false, false, true);
 }
-add_action( 'wpinv_update_status', 'wpinv_record_status_change', 100, 3 );
+add_action('wpinv_update_status', 'wpinv_record_status_change', 100, 3);
 
-function wpinv_complete_payment( $invoice_id, $new_status, $old_status ) {
+function wpinv_complete_payment($invoice_id, $new_status, $old_status) {
     global $wpi_has_free_trial;
     
     $wpi_has_free_trial = false;
     
-    if ( $old_status == 'publish' ) {
+    if ($old_status == 'publish') {
         return; // Make sure that payments are only paid once
     }
 
     // Make sure the payment completion is only processed when new status is paid
-    if ( $new_status != 'publish' ) {
+    if ($new_status != 'publish') {
         return;
     }
 
-    $invoice = new WPInv_Invoice( $invoice_id );
-    if ( empty( $invoice ) ) {
+    $invoice = new WPInv_Invoice($invoice_id);
+    if (empty($invoice)) {
         return;
     }
 
@@ -1096,58 +1096,58 @@ 
     $completed_date = $invoice->completed_date;
     $cart_details   = $invoice->cart_details;
 
-    do_action( 'wpinv_pre_complete_payment', $invoice_id );
+    do_action('wpinv_pre_complete_payment', $invoice_id);
 
-    if ( is_array( $cart_details ) ) {
+    if (is_array($cart_details)) {
         // Increase purchase count and earnings
-        foreach ( $cart_details as $cart_index => $item ) {
+        foreach ($cart_details as $cart_index => $item) {
             // Ensure these actions only run once, ever
-            if ( empty( $completed_date ) ) {
-                do_action( 'wpinv_complete_item_payment', $item['id'], $invoice_id, $item, $cart_index );
+            if (empty($completed_date)) {
+                do_action('wpinv_complete_item_payment', $item['id'], $invoice_id, $item, $cart_index);
             }
         }
     }
     
     // Check for discount codes and increment their use counts
-    if ( $discounts = $invoice->get_discounts( true ) ) {
-        if( ! empty( $discounts ) ) {
-            foreach( $discounts as $code ) {
-                wpinv_increase_discount_usage( $code );
+    if ($discounts = $invoice->get_discounts(true)) {
+        if (!empty($discounts)) {
+            foreach ($discounts as $code) {
+                wpinv_increase_discount_usage($code);
             }
         }
     }
     
     // Ensure this action only runs once ever
-    if( empty( $completed_date ) ) {
+    if (empty($completed_date)) {
         // Save the completed date
-        $invoice->set( 'completed_date', current_time( 'mysql', 0 ) );
+        $invoice->set('completed_date', current_time('mysql', 0));
         $invoice->save();
 
-        do_action( 'wpinv_complete_payment', $invoice_id );
+        do_action('wpinv_complete_payment', $invoice_id);
     }
 
     // Empty the shopping cart
     wpinv_empty_cart();
 }
-add_action( 'wpinv_update_status', 'wpinv_complete_payment', 100, 3 );
+add_action('wpinv_update_status', 'wpinv_complete_payment', 100, 3);
 
-function wpinv_update_payment_status( $invoice_id, $new_status = 'publish' ) {    
-    $invoice = !empty( $invoice_id ) && is_object( $invoice_id ) ? $invoice_id : wpinv_get_invoice( (int)$invoice_id );
+function wpinv_update_payment_status($invoice_id, $new_status = 'publish') {    
+    $invoice = !empty($invoice_id) && is_object($invoice_id) ? $invoice_id : wpinv_get_invoice((int) $invoice_id);
     
-    if ( empty( $invoice ) ) {
+    if (empty($invoice)) {
         return false;
     }
     
-    return $invoice->update_status( $new_status );
+    return $invoice->update_status($new_status);
 }
 
-function wpinv_cart_has_fees( $type = 'all' ) {
+function wpinv_cart_has_fees($type = 'all') {
     return false;
 }
 
 function wpinv_validate_checkout_fields() {    
     // Check if there is $_POST
-    if ( empty( $_POST ) ) {
+    if (empty($_POST)) {
         return false;
     }
     
@@ -1159,11 +1159,11 @@ 
     );
     
     // Validate agree to terms
-    $page = wpinv_get_option( 'tandc_page' );
-    if(isset($page) && (int)$page > 0 && apply_filters( 'wpinv_checkout_show_terms', true )){
+    $page = wpinv_get_option('tandc_page');
+    if (isset($page) && (int) $page > 0 && apply_filters('wpinv_checkout_show_terms', true)) {
         // Validate agree to terms
-        if ( ! isset( $_POST['wpi_terms'] ) || !$_POST['wpi_terms'] ) {
-            wpinv_set_error( 'accept_terms', apply_filters( 'wpinv_accept_terms_error_text', __( 'You must accept terms and conditions', 'invoicing' ) ) );
+        if (!isset($_POST['wpi_terms']) || !$_POST['wpi_terms']) {
+            wpinv_set_error('accept_terms', apply_filters('wpinv_accept_terms_error_text', __('You must accept terms and conditions', 'invoicing')));
         }
     }
     
@@ -1179,26 +1179,26 @@ 
     
     $invoice = wpinv_get_invoice_cart();
     $has_subscription = $invoice->is_recurring();
-    if ( empty( $invoice ) ) {
-        wpinv_set_error( 'invalid_invoice', __( 'Your cart is empty.', 'invoicing' ) );
+    if (empty($invoice)) {
+        wpinv_set_error('invalid_invoice', __('Your cart is empty.', 'invoicing'));
         return $gateway;
     }
 
     // Check if a gateway value is present
-    if ( !empty( $_REQUEST['wpi-gateway'] ) ) {
-        $gateway = sanitize_text_field( $_REQUEST['wpi-gateway'] );
+    if (!empty($_REQUEST['wpi-gateway'])) {
+        $gateway = sanitize_text_field($_REQUEST['wpi-gateway']);
 
-        if ( $invoice->is_free() ) {
+        if ($invoice->is_free()) {
             $gateway = 'manual';
-        } elseif ( !wpinv_is_gateway_active( $gateway ) ) {
-            wpinv_set_error( 'invalid_gateway', __( 'The selected payment gateway is not enabled', 'invoicing' ) );
-        } elseif ( $has_subscription && !wpinv_gateway_support_subscription( $gateway ) ) {
-            wpinv_set_error( 'invalid_gateway', __( 'The selected payment gateway doesnot support subscription payment', 'invoicing' ) );
+        } elseif (!wpinv_is_gateway_active($gateway)) {
+            wpinv_set_error('invalid_gateway', __('The selected payment gateway is not enabled', 'invoicing'));
+        } elseif ($has_subscription && !wpinv_gateway_support_subscription($gateway)) {
+            wpinv_set_error('invalid_gateway', __('The selected payment gateway doesnot support subscription payment', 'invoicing'));
         }
     }
 
-    if ( $has_subscription && count( wpinv_get_cart_contents() ) > 1 ) {
-        wpinv_set_error( 'subscription_invalid', __( 'Only one subscription may be purchased through payment per checkout.', 'invoicing' ) );
+    if ($has_subscription && count(wpinv_get_cart_contents()) > 1) {
+        wpinv_set_error('subscription_invalid', __('Only one subscription may be purchased through payment per checkout.', 'invoicing'));
     }
 
     return $gateway;
@@ -1212,10 +1212,10 @@ 
     
     $error = false;
     // If we have discounts, loop through them
-    if ( ! empty( $discounts ) ) {
-        foreach ( $discounts as $discount ) {
+    if (!empty($discounts)) {
+        foreach ($discounts as $discount) {
             // Check if valid
-            if (  !wpinv_is_discount_valid( $discount, (int)$wpi_cart->get_user_id() ) ) {
+            if (!wpinv_is_discount_valid($discount, (int) $wpi_cart->get_user_id())) {
                 // Discount is not valid
                 $error = true;
             }
@@ -1225,20 +1225,20 @@ 
         return NULL;
     }
 
-    if ( $error && !wpinv_get_errors() ) {
-        wpinv_set_error( 'invalid_discount', __( 'Discount code you entered is invalid', 'invoicing' ) );
+    if ($error && !wpinv_get_errors()) {
+        wpinv_set_error('invalid_discount', __('Discount code you entered is invalid', 'invoicing'));
     }
 
-    return implode( ',', $discounts );
+    return implode(',', $discounts);
 }
 
 function wpinv_checkout_validate_cc() {
     $card_data = wpinv_checkout_get_cc_info();
 
     // Validate the card zip
-    if ( !empty( $card_data['wpinv_zip'] ) ) {
-        if ( !wpinv_checkout_validate_cc_zip( $card_data['wpinv_zip'], $card_data['wpinv_country'] ) ) {
-            wpinv_set_error( 'invalid_cc_zip', __( 'The zip / postcode you entered for your billing address is invalid', 'invoicing' ) );
+    if (!empty($card_data['wpinv_zip'])) {
+        if (!wpinv_checkout_validate_cc_zip($card_data['wpinv_zip'], $card_data['wpinv_country'])) {
+            wpinv_set_error('invalid_cc_zip', __('The zip / postcode you entered for your billing address is invalid', 'invoicing'));
         }
     }
 
@@ -1248,28 +1248,28 @@ 
 
 function wpinv_checkout_get_cc_info() {
 	$cc_info = array();
-	$cc_info['card_name']      = isset( $_POST['card_name'] )       ? sanitize_text_field( $_POST['card_name'] )       : '';
-	$cc_info['card_number']    = isset( $_POST['card_number'] )     ? sanitize_text_field( $_POST['card_number'] )     : '';
-	$cc_info['card_cvc']       = isset( $_POST['card_cvc'] )        ? sanitize_text_field( $_POST['card_cvc'] )        : '';
-	$cc_info['card_exp_month'] = isset( $_POST['card_exp_month'] )  ? sanitize_text_field( $_POST['card_exp_month'] )  : '';
-	$cc_info['card_exp_year']  = isset( $_POST['card_exp_year'] )   ? sanitize_text_field( $_POST['card_exp_year'] )   : '';
-	$cc_info['card_address']   = isset( $_POST['wpinv_address'] )  ? sanitize_text_field( $_POST['wpinv_address'] ) : '';
-	$cc_info['card_city']      = isset( $_POST['wpinv_city'] )     ? sanitize_text_field( $_POST['wpinv_city'] )    : '';
-	$cc_info['card_state']     = isset( $_POST['wpinv_state'] )    ? sanitize_text_field( $_POST['wpinv_state'] )   : '';
-	$cc_info['card_country']   = isset( $_POST['wpinv_country'] )  ? sanitize_text_field( $_POST['wpinv_country'] ) : '';
-	$cc_info['card_zip']       = isset( $_POST['wpinv_zip'] )      ? sanitize_text_field( $_POST['wpinv_zip'] )     : '';
+	$cc_info['card_name']      = isset($_POST['card_name']) ? sanitize_text_field($_POST['card_name']) : '';
+	$cc_info['card_number']    = isset($_POST['card_number']) ? sanitize_text_field($_POST['card_number']) : '';
+	$cc_info['card_cvc']       = isset($_POST['card_cvc']) ? sanitize_text_field($_POST['card_cvc']) : '';
+	$cc_info['card_exp_month'] = isset($_POST['card_exp_month']) ? sanitize_text_field($_POST['card_exp_month']) : '';
+	$cc_info['card_exp_year']  = isset($_POST['card_exp_year']) ? sanitize_text_field($_POST['card_exp_year']) : '';
+	$cc_info['card_address']   = isset($_POST['wpinv_address']) ? sanitize_text_field($_POST['wpinv_address']) : '';
+	$cc_info['card_city']      = isset($_POST['wpinv_city']) ? sanitize_text_field($_POST['wpinv_city']) : '';
+	$cc_info['card_state']     = isset($_POST['wpinv_state']) ? sanitize_text_field($_POST['wpinv_state']) : '';
+	$cc_info['card_country']   = isset($_POST['wpinv_country']) ? sanitize_text_field($_POST['wpinv_country']) : '';
+	$cc_info['card_zip']       = isset($_POST['wpinv_zip']) ? sanitize_text_field($_POST['wpinv_zip']) : '';
 
 	// Return cc info
 	return $cc_info;
 }
 
-function wpinv_checkout_validate_cc_zip( $zip = 0, $country_code = '' ) {
+function wpinv_checkout_validate_cc_zip($zip = 0, $country_code = '') {
     $ret = false;
 
-    if ( empty( $zip ) || empty( $country_code ) )
+    if (empty($zip) || empty($country_code))
         return $ret;
 
-    $country_code = strtoupper( $country_code );
+    $country_code = strtoupper($country_code);
 
     $zip_regex = array(
         "AD" => "AD\d{3}",
@@ -1429,72 +1429,72 @@ 
         "ZM" => "\d{5}"
     );
 
-    if ( ! isset ( $zip_regex[ $country_code ] ) || preg_match( "/" . $zip_regex[ $country_code ] . "/i", $zip ) )
+    if (!isset ($zip_regex[$country_code]) || preg_match("/" . $zip_regex[$country_code] . "/i", $zip))
         $ret = true;
 
-    return apply_filters( 'wpinv_is_zip_valid', $ret, $zip, $country_code );
+    return apply_filters('wpinv_is_zip_valid', $ret, $zip, $country_code);
 }
 
 function wpinv_checkout_validate_agree_to_terms() {
     // Validate agree to terms
-    if ( ! isset( $_POST['wpi_agree_to_terms'] ) || $_POST['wpi_agree_to_terms'] != 1 ) {
+    if (!isset($_POST['wpi_agree_to_terms']) || $_POST['wpi_agree_to_terms'] != 1) {
         // User did not agree
-        wpinv_set_error( 'agree_to_terms', apply_filters( 'wpinv_agree_to_terms_text', __( 'You must agree to the terms of use', 'invoicing' ) ) );
+        wpinv_set_error('agree_to_terms', apply_filters('wpinv_agree_to_terms_text', __('You must agree to the terms of use', 'invoicing')));
     }
 }
 
 function wpinv_checkout_validate_invoice_user() {
     global $wpi_cart, $user_ID;
 
-    if(empty($wpi_cart)){
+    if (empty($wpi_cart)) {
         $wpi_cart = wpinv_get_invoice_cart();
     }
 
-    $invoice_user = (int)$wpi_cart->get_user_id();
+    $invoice_user = (int) $wpi_cart->get_user_id();
     $valid_user_data = array(
         'user_id' => $invoice_user
     );
 
     // If guest checkout allowed
-    if ( !wpinv_require_login_to_checkout() ) {
+    if (!wpinv_require_login_to_checkout()) {
         return $valid_user_data;
     }
     
     // Verify there is a user_ID
-    if ( $user_ID == $invoice_user ) {
+    if ($user_ID == $invoice_user) {
         // Get the logged in user data
-        $user_data = get_userdata( $user_ID );
-        $required_fields  = wpinv_checkout_required_fields();
+        $user_data = get_userdata($user_ID);
+        $required_fields = wpinv_checkout_required_fields();
 
         // Loop through required fields and show error messages
-         if ( !empty( $required_fields ) ) {
-            foreach ( $required_fields as $field_name => $value ) {
-                if ( in_array( $value, $required_fields ) && empty( $_POST[ 'wpinv_' . $field_name ] ) ) {
-                    wpinv_set_error( $value['error_id'], $value['error_message'] );
+         if (!empty($required_fields)) {
+            foreach ($required_fields as $field_name => $value) {
+                if (in_array($value, $required_fields) && empty($_POST['wpinv_' . $field_name])) {
+                    wpinv_set_error($value['error_id'], $value['error_message']);
                 }
             }
         }
 
         // Verify data
-        if ( $user_data ) {
+        if ($user_data) {
             // Collected logged in user data
             $valid_user_data = array(
                 'user_id'     => $user_ID,
-                'email'       => isset( $_POST['wpinv_email'] ) ? sanitize_email( $_POST['wpinv_email'] ) : $user_data->user_email,
-                'first_name'  => isset( $_POST['wpinv_first_name'] ) && ! empty( $_POST['wpinv_first_name'] ) ? sanitize_text_field( $_POST['wpinv_first_name'] ) : $user_data->first_name,
-                'last_name'   => isset( $_POST['wpinv_last_name'] ) && ! empty( $_POST['wpinv_last_name']  ) ? sanitize_text_field( $_POST['wpinv_last_name']  ) : $user_data->last_name,
+                'email'       => isset($_POST['wpinv_email']) ? sanitize_email($_POST['wpinv_email']) : $user_data->user_email,
+                'first_name'  => isset($_POST['wpinv_first_name']) && !empty($_POST['wpinv_first_name']) ? sanitize_text_field($_POST['wpinv_first_name']) : $user_data->first_name,
+                'last_name'   => isset($_POST['wpinv_last_name']) && !empty($_POST['wpinv_last_name']) ? sanitize_text_field($_POST['wpinv_last_name']) : $user_data->last_name,
             );
 
-            if ( !empty( $_POST[ 'wpinv_email' ] ) && !is_email( $_POST[ 'wpinv_email' ] ) ) {
-                wpinv_set_error( 'invalid_email', __( 'Please enter a valid email address', 'invoicing' ) );
+            if (!empty($_POST['wpinv_email']) && !is_email($_POST['wpinv_email'])) {
+                wpinv_set_error('invalid_email', __('Please enter a valid email address', 'invoicing'));
             }
         } else {
             // Set invalid user error
-            wpinv_set_error( 'invalid_user', __( 'The user billing information is invalid', 'invoicing' ) );
+            wpinv_set_error('invalid_user', __('The user billing information is invalid', 'invoicing'));
         }
     } else {
         // Set invalid user error
-        wpinv_set_error( 'invalid_user_id', __( 'The invalid invoice user id', 'invoicing' ) );
+        wpinv_set_error('invalid_user_id', __('The invalid invoice user id', 'invoicing'));
     }
 
     // Return user data
@@ -1506,27 +1506,27 @@ 
 
     $data = array();
     
-    if ( is_user_logged_in() ) {
-        if ( !wpinv_require_login_to_checkout() || ( wpinv_require_login_to_checkout() && (int)$wpi_cart->get_user_id() === (int)get_current_user_id() ) ) {
-            $data['user_id'] = (int)get_current_user_id();
+    if (is_user_logged_in()) {
+        if (!wpinv_require_login_to_checkout() || (wpinv_require_login_to_checkout() && (int) $wpi_cart->get_user_id() === (int) get_current_user_id())) {
+            $data['user_id'] = (int) get_current_user_id();
         } else {
-            wpinv_set_error( 'logged_in_only', __( 'You are not allowed to pay for this invoice', 'invoicing' ) );
+            wpinv_set_error('logged_in_only', __('You are not allowed to pay for this invoice', 'invoicing'));
         }
     } else {
         // If guest checkout allowed
-        if ( !wpinv_require_login_to_checkout() ) {
+        if (!wpinv_require_login_to_checkout()) {
             $data['user_id'] = 0;
         } else {
-            wpinv_set_error( 'logged_in_only', __( 'You must be logged in to pay for this invoice', 'invoicing' ) );
+            wpinv_set_error('logged_in_only', __('You must be logged in to pay for this invoice', 'invoicing'));
         }
     }
 
     return $data;
 }
 
-function wpinv_checkout_form_get_user( $valid_data = array() ) {
+function wpinv_checkout_form_get_user($valid_data = array()) {
 
-    if ( !empty( $valid_data['current_user']['user_id'] ) ) {
+    if (!empty($valid_data['current_user']['user_id'])) {
         $user = $valid_data['current_user'];
     } else {
         // Set the valid invoice user
@@ -1534,7 +1534,7 @@ 
     }
 
     // Verify invoice have an user
-    if ( false === $user || empty( $user ) ) {
+    if (false === $user || empty($user)) {
         return false;
     }
 
@@ -1551,11 +1551,11 @@ 
         'zip',
     );
     
-    foreach ( $address_fields as $field ) {
-        $user[$field]  = !empty( $_POST['wpinv_' . $field] ) ? sanitize_text_field( $_POST['wpinv_' . $field] ) : false;
+    foreach ($address_fields as $field) {
+        $user[$field] = !empty($_POST['wpinv_' . $field]) ? sanitize_text_field($_POST['wpinv_' . $field]) : false;
         
-        if ( !empty( $user['user_id'] ) && !empty( $valid_data['current_user']['user_id'] ) && $valid_data['current_user']['user_id'] == $valid_data['invoice_user']['user_id'] ) {
-            update_user_meta( $user['user_id'], '_wpinv_' . $field, $user[$field] );
+        if (!empty($user['user_id']) && !empty($valid_data['current_user']['user_id']) && $valid_data['current_user']['user_id'] == $valid_data['invoice_user']['user_id']) {
+            update_user_meta($user['user_id'], '_wpinv_' . $field, $user[$field]);
         }
     }
 
@@ -1563,28 +1563,28 @@ 
     return $user;
 }
 
-function wpinv_set_checkout_session( $invoice_data = array() ) {
+function wpinv_set_checkout_session($invoice_data = array()) {
     global $wpi_session;
     
-    return $wpi_session->set( 'wpinv_checkout', $invoice_data );
+    return $wpi_session->set('wpinv_checkout', $invoice_data);
 }
 
 function wpinv_get_checkout_session() {
 	global $wpi_session;
     
-    return $wpi_session->get( 'wpinv_checkout' );
+    return $wpi_session->get('wpinv_checkout');
 }
 
 function wpinv_empty_cart() {
     global $wpi_session;
 
     // Remove cart contents
-    $wpi_session->set( 'wpinv_checkout', NULL );
+    $wpi_session->set('wpinv_checkout', NULL);
 
     // Remove all cart fees
-    $wpi_session->set( 'wpi_cart_fees', NULL );
+    $wpi_session->set('wpi_cart_fees', NULL);
 
-    do_action( 'wpinv_empty_cart' );
+    do_action('wpinv_empty_cart');
 }
 
 function wpinv_process_checkout() {
@@ -1593,7 +1593,7 @@ 
     wpinv_clear_errors();
     
     $invoice = wpinv_get_invoice_cart();
-    if ( empty( $invoice ) ) {
+    if (empty($invoice)) {
         return false;
     }
     
@@ -1601,42 +1601,42 @@ 
     
     $wpi_checkout_id = $invoice->ID;
     
-    do_action( 'wpinv_pre_process_checkout' );
+    do_action('wpinv_pre_process_checkout');
     
-    if ( !wpinv_get_cart_contents() ) { // Make sure the cart isn't empty
+    if (!wpinv_get_cart_contents()) { // Make sure the cart isn't empty
         $valid_data = false;
-        wpinv_set_error( 'empty_cart', __( 'Your cart is empty', 'invoicing' ) );
+        wpinv_set_error('empty_cart', __('Your cart is empty', 'invoicing'));
     } else {
         // Validate the form $_POST data
         $valid_data = wpinv_validate_checkout_fields();
         
         // Allow themes and plugins to hook to errors
-        do_action( 'wpinv_checkout_error_checks', $valid_data, $_POST );
+        do_action('wpinv_checkout_error_checks', $valid_data, $_POST);
     }
     
-    $is_ajax    = defined( 'DOING_AJAX' ) && DOING_AJAX;
+    $is_ajax = defined('DOING_AJAX') && DOING_AJAX;
     
     // Validate the user
-    $user = wpinv_checkout_form_get_user( $valid_data );
+    $user = wpinv_checkout_form_get_user($valid_data);
 
     // Let extensions validate fields after user is logged in if user has used login/registration form
-    do_action( 'wpinv_checkout_user_error_checks', $user, $valid_data, $_POST );
+    do_action('wpinv_checkout_user_error_checks', $user, $valid_data, $_POST);
     
-    if ( false === $valid_data || wpinv_get_errors() || ! $user ) {
-        if ( $is_ajax ) {
-            do_action( 'wpinv_ajax_checkout_errors' );
+    if (false === $valid_data || wpinv_get_errors() || !$user) {
+        if ($is_ajax) {
+            do_action('wpinv_ajax_checkout_errors');
             die();
         } else {
             return false;
         }
     }
 
-    if ( $is_ajax ) {
+    if ($is_ajax) {
         // Save address fields.
-        $address_fields = array( 'first_name', 'last_name', 'phone', 'address', 'city', 'country', 'state', 'zip', 'company' );
-        foreach ( $address_fields as $field ) {
-            if ( isset( $user[$field] ) ) {
-                $invoice->set( $field, $user[$field] );
+        $address_fields = array('first_name', 'last_name', 'phone', 'address', 'city', 'country', 'state', 'zip', 'company');
+        foreach ($address_fields as $field) {
+            if (isset($user[$field])) {
+                $invoice->set($field, $user[$field]);
             }
 
             $invoice->save();
@@ -1644,16 +1644,16 @@ 
 
         $response['success']            = true;
         $response['data']['subtotal']   = $invoice->get_subtotal();
-        $response['data']['subtotalf']  = $invoice->get_subtotal( true );
+        $response['data']['subtotalf']  = $invoice->get_subtotal(true);
         $response['data']['discount']   = $invoice->get_discount();
-        $response['data']['discountf']  = $invoice->get_discount( true );
+        $response['data']['discountf']  = $invoice->get_discount(true);
         $response['data']['tax']        = $invoice->get_tax();
-        $response['data']['taxf']       = $invoice->get_tax( true );
+        $response['data']['taxf']       = $invoice->get_tax(true);
         $response['data']['total']      = $invoice->get_total();
-        $response['data']['totalf']     = $invoice->get_total( true );
-	    $response['data']['free']       = $invoice->is_free() && ( ! ( (float) $response['data']['total'] > 0 ) || $invoice->is_free_trial() ) ? true : false;
+        $response['data']['totalf']     = $invoice->get_total(true);
+	    $response['data']['free'] = $invoice->is_free() && (!((float) $response['data']['total'] > 0) || $invoice->is_free_trial()) ? true : false;
 
-        wp_send_json( $response );
+        wp_send_json($response);
     }
     
     $user_info = array(
@@ -1675,42 +1675,42 @@ 
     
     // Setup invoice information
     $invoice_data = array(
-        'invoice_id'        => !empty( $invoice ) ? $invoice->ID : 0,
+        'invoice_id'        => !empty($invoice) ? $invoice->ID : 0,
         'items'             => $cart_items,
         'cart_discounts'    => $discounts,
-        'fees'              => wpinv_get_cart_fees(),        // Any arbitrary fees that have been added to the cart
-        'subtotal'          => wpinv_get_cart_subtotal( $cart_items ),    // Amount before taxes and discounts
-        'discount'          => wpinv_get_cart_items_discount_amount( $cart_items, $discounts ), // Discounted amount
-        'tax'               => wpinv_get_cart_tax( $cart_items ),               // Taxed amount
-        'price'             => wpinv_get_cart_total( $cart_items, $discounts ),    // Amount after taxes
+        'fees'              => wpinv_get_cart_fees(), // Any arbitrary fees that have been added to the cart
+        'subtotal'          => wpinv_get_cart_subtotal($cart_items), // Amount before taxes and discounts
+        'discount'          => wpinv_get_cart_items_discount_amount($cart_items, $discounts), // Discounted amount
+        'tax'               => wpinv_get_cart_tax($cart_items), // Taxed amount
+        'price'             => wpinv_get_cart_total($cart_items, $discounts), // Amount after taxes
         'invoice_key'       => $invoice->get_key() ? $invoice->get_key() : $invoice->generate_key(),
         'user_email'        => $invoice->get_email(),
-        'date'              => date( 'Y-m-d H:i:s', current_time( 'timestamp' ) ),
-        'user_info'         => stripslashes_deep( $user_info ),
+        'date'              => date('Y-m-d H:i:s', current_time('timestamp')),
+        'user_info'         => stripslashes_deep($user_info),
         'post_data'         => $_POST,
         'cart_details'      => $cart_items,
         'gateway'           => $valid_data['gateway'],
         'card_info'         => $valid_data['cc_info']
     );
     
-    $vat_info   = $wpinv_euvat->current_vat_data();
-    if ( is_array( $vat_info ) ) {
+    $vat_info = $wpinv_euvat->current_vat_data();
+    if (is_array($vat_info)) {
         $invoice_data['user_info']['vat_number']        = $vat_info['number'];
         $invoice_data['user_info']['vat_rate']          = wpinv_get_tax_rate($invoice_data['user_info']['country'], $invoice_data['user_info']['state']);
-        $invoice_data['user_info']['adddress_confirmed']    = isset($vat_info['adddress_confirmed']) ? $vat_info['adddress_confirmed'] : false;
+        $invoice_data['user_info']['adddress_confirmed'] = isset($vat_info['adddress_confirmed']) ? $vat_info['adddress_confirmed'] : false;
 
         // Add the VAT rate to each item in the cart
-        foreach( $invoice_data['cart_details'] as $key => $item_data) {
+        foreach ($invoice_data['cart_details'] as $key => $item_data) {
             $rate = wpinv_get_tax_rate($invoice_data['user_info']['country'], $invoice_data['user_info']['state'], $item_data['id']);
-            $invoice_data['cart_details'][$key]['vat_rate'] = wpinv_round_amount( $rate, 4 );
+            $invoice_data['cart_details'][$key]['vat_rate'] = wpinv_round_amount($rate, 4);
         }
     }
     
     // Save vat fields.
-    $address_fields = array( 'vat_number', 'vat_rate', 'adddress_confirmed' );
-    foreach ( $address_fields as $field ) {
-        if ( isset( $invoice_data['user_info'][$field] ) ) {
-            $invoice->set( $field, $invoice_data['user_info'][$field] );
+    $address_fields = array('vat_number', 'vat_rate', 'adddress_confirmed');
+    foreach ($address_fields as $field) {
+        if (isset($invoice_data['user_info'][$field])) {
+            $invoice->set($field, $invoice_data['user_info'][$field]);
         }
 
         $invoice->save();
@@ -1720,55 +1720,55 @@ 
     $valid_data['user'] = $user;
     
     // Allow themes and plugins to hook before the gateway
-    do_action( 'wpinv_checkout_before_gateway', $_POST, $user_info, $valid_data );
+    do_action('wpinv_checkout_before_gateway', $_POST, $user_info, $valid_data);
     
     // If the total amount in the cart is 0, send to the manual gateway. This emulates a free invoice
-    if ( !$invoice_data['price'] ) {
+    if (!$invoice_data['price']) {
         // Revert to manual
         $invoice_data['gateway'] = 'manual';
         $_POST['wpi-gateway'] = 'manual';
     }
     
     // Allow the invoice data to be modified before it is sent to the gateway
-    $invoice_data = apply_filters( 'wpinv_data_before_gateway', $invoice_data, $valid_data );
+    $invoice_data = apply_filters('wpinv_data_before_gateway', $invoice_data, $valid_data);
     
-    if ( $invoice_data['price'] && $invoice_data['gateway'] == 'manual' ) {
+    if ($invoice_data['price'] && $invoice_data['gateway'] == 'manual') {
         $mode = 'test';
     } else {
-        $mode = wpinv_is_test_mode( $invoice_data['gateway'] ) ? 'test' : 'live';
+        $mode = wpinv_is_test_mode($invoice_data['gateway']) ? 'test' : 'live';
     }
     
     // Setup the data we're storing in the purchase session
     $session_data = $invoice_data;
     // Make sure credit card numbers are never stored in sessions
-    if ( !empty( $session_data['card_info']['card_number'] ) ) {
-        unset( $session_data['card_info']['card_number'] );
+    if (!empty($session_data['card_info']['card_number'])) {
+        unset($session_data['card_info']['card_number']);
     }
     
     // Used for showing item links to non logged-in users after purchase, and for other plugins needing purchase data.
-    wpinv_set_checkout_session( $invoice_data );
+    wpinv_set_checkout_session($invoice_data);
     
     // Set gateway
-    $invoice->update_meta( '_wpinv_gateway', $invoice_data['gateway'] );
-    $invoice->update_meta( '_wpinv_mode', $mode );
-    $invoice->update_meta( '_wpinv_checkout', date_i18n( 'Y-m-d H:i:s', current_time( 'timestamp' ) ) );
+    $invoice->update_meta('_wpinv_gateway', $invoice_data['gateway']);
+    $invoice->update_meta('_wpinv_mode', $mode);
+    $invoice->update_meta('_wpinv_checkout', date_i18n('Y-m-d H:i:s', current_time('timestamp')));
     
-    do_action( 'wpinv_checkout_before_send_to_gateway', $invoice, $invoice_data );
+    do_action('wpinv_checkout_before_send_to_gateway', $invoice, $invoice_data);
 
     // Send info to the gateway for payment processing
-    wpinv_send_to_gateway( $invoice_data['gateway'], $invoice_data );
+    wpinv_send_to_gateway($invoice_data['gateway'], $invoice_data);
     die();
 }
-add_action( 'wpinv_payment', 'wpinv_process_checkout' );
+add_action('wpinv_payment', 'wpinv_process_checkout');
 
-function wpinv_get_invoices( $args ) {
-    $args = wp_parse_args( $args, array(
-        'status'   => array_keys( wpinv_get_invoice_statuses() ),
+function wpinv_get_invoices($args) {
+    $args = wp_parse_args($args, array(
+        'status'   => array_keys(wpinv_get_invoice_statuses()),
         'type'     => 'wpi_invoice',
         'parent'   => null,
         'user'     => null,
         'email'    => '',
-        'limit'    => get_option( 'posts_per_page' ),
+        'limit'    => get_option('posts_per_page'),
         'offset'   => null,
         'page'     => 1,
         'exclude'  => array(),
@@ -1776,7 +1776,7 @@ 
         'order'    => 'DESC',
         'return'   => 'objects',
         'paginate' => false,
-    ) );
+    ));
     
     // Handle some BW compatibility arg names where wp_query args differ in naming.
     $map_legacy = array(
@@ -1789,18 +1789,18 @@ 
         'paged'          => 'page',
     );
 
-    foreach ( $map_legacy as $from => $to ) {
-        if ( isset( $args[ $from ] ) ) {
-            $args[ $to ] = $args[ $from ];
+    foreach ($map_legacy as $from => $to) {
+        if (isset($args[$from])) {
+            $args[$to] = $args[$from];
         }
     }
 
-    if ( get_query_var( 'paged' ) )
+    if (get_query_var('paged'))
         $args['page'] = get_query_var('paged');
-    else if ( get_query_var( 'page' ) )
-        $args['page'] = get_query_var( 'page' );
-    else if ( !empty( $args[ 'page' ] ) )
-        $args['page'] = $args[ 'page' ];
+    else if (get_query_var('page'))
+        $args['page'] = get_query_var('page');
+    else if (!empty($args['page']))
+        $args['page'] = $args['page'];
     else
         $args['page'] = 1;
 
@@ -1813,48 +1813,48 @@ 
         'post_status'    => $args['status'],
         'posts_per_page' => $args['limit'],
         'meta_query'     => array(),
-        'date_query'     => !empty( $args['date_query'] ) ? $args['date_query'] : array(),
+        'date_query'     => !empty($args['date_query']) ? $args['date_query'] : array(),
         'fields'         => 'ids',
         'orderby'        => $args['orderby'],
         'order'          => $args['order'],
     );
     
-    if ( !empty( $args['user'] ) ) {
-        $wp_query_args['author'] = absint( $args['user'] );
+    if (!empty($args['user'])) {
+        $wp_query_args['author'] = absint($args['user']);
     }
 
-    if ( ! is_null( $args['parent'] ) ) {
-        $wp_query_args['post_parent'] = absint( $args['parent'] );
+    if (!is_null($args['parent'])) {
+        $wp_query_args['post_parent'] = absint($args['parent']);
     }
 
-    if ( ! is_null( $args['offset'] ) ) {
-        $wp_query_args['offset'] = absint( $args['offset'] );
+    if (!is_null($args['offset'])) {
+        $wp_query_args['offset'] = absint($args['offset']);
     } else {
-        $wp_query_args['paged'] = absint( $args['page'] );
+        $wp_query_args['paged'] = absint($args['page']);
     }
 
-    if ( ! empty( $args['exclude'] ) ) {
-        $wp_query_args['post__not_in'] = array_map( 'absint', $args['exclude'] );
+    if (!empty($args['exclude'])) {
+        $wp_query_args['post__not_in'] = array_map('absint', $args['exclude']);
     }
 
-    if ( ! $args['paginate' ] ) {
+    if (!$args['paginate']) {
         $wp_query_args['no_found_rows'] = true;
     }
 
     $wp_query_args = apply_filters('wpinv_get_invoices_args', $wp_query_args, $args);
 
     // Get results.
-    $invoices = new WP_Query( $wp_query_args );
+    $invoices = new WP_Query($wp_query_args);
 
-    if ( 'objects' === $args['return'] ) {
-        $return = array_map( 'wpinv_get_invoice', $invoices->posts );
-    } elseif ( 'self' === $args['return'] ) {
+    if ('objects' === $args['return']) {
+        $return = array_map('wpinv_get_invoice', $invoices->posts);
+    } elseif ('self' === $args['return']) {
         return $invoices;
     } else {
         $return = $invoices->posts;
     }
 
-    if ( $args['paginate' ] ) {
+    if ($args['paginate']) {
         return (object) array(
             'invoices'      => $return,
             'total'         => $invoices->found_posts,
@@ -1867,22 +1867,22 @@ 
 
 function wpinv_get_user_invoices_columns() {
     $columns = array(
-            'invoice-number'  => array( 'title' => __( 'ID', 'invoicing' ), 'class' => 'text-left' ),
-            'created-date'    => array( 'title' => __( 'Created Date', 'invoicing' ), 'class' => 'text-left' ),
-            'payment-date'    => array( 'title' => __( 'Payment Date', 'invoicing' ), 'class' => 'text-left' ),
-            'invoice-status'  => array( 'title' => __( 'Status', 'invoicing' ), 'class' => 'text-center' ),
-            'invoice-total'   => array( 'title' => __( 'Total', 'invoicing' ), 'class' => 'text-right' ),
-            'invoice-actions' => array( 'title' => '&nbsp;', 'class' => 'text-center' ),
+            'invoice-number'  => array('title' => __('ID', 'invoicing'), 'class' => 'text-left'),
+            'created-date'    => array('title' => __('Created Date', 'invoicing'), 'class' => 'text-left'),
+            'payment-date'    => array('title' => __('Payment Date', 'invoicing'), 'class' => 'text-left'),
+            'invoice-status'  => array('title' => __('Status', 'invoicing'), 'class' => 'text-center'),
+            'invoice-total'   => array('title' => __('Total', 'invoicing'), 'class' => 'text-right'),
+            'invoice-actions' => array('title' => '&nbsp;', 'class' => 'text-center'),
         );
 
-    return apply_filters( 'wpinv_user_invoices_columns', $columns );
+    return apply_filters('wpinv_user_invoices_columns', $columns);
 }
 
-function wpinv_payment_receipt( $atts, $content = null ) {
+function wpinv_payment_receipt($atts, $content = null) {
     global $wpinv_receipt_args;
 
-    $wpinv_receipt_args = shortcode_atts( array(
-        'error'           => __( 'Sorry, trouble retrieving payment receipt.', 'invoicing' ),
+    $wpinv_receipt_args = shortcode_atts(array(
+        'error'           => __('Sorry, trouble retrieving payment receipt.', 'invoicing'),
         'price'           => true,
         'discount'        => true,
         'items'           => true,
@@ -1891,197 +1891,197 @@ 
         'invoice_key'     => false,
         'payment_method'  => true,
         'invoice_id'      => true
-    ), $atts, 'wpinv_receipt' );
+    ), $atts, 'wpinv_receipt');
 
     $session = wpinv_get_checkout_session();
-    if ( isset( $_GET['invoice_key'] ) ) {
-        $invoice_key = urldecode( $_GET['invoice_key'] );
-    } else if ( $session && isset( $session['invoice_key'] ) ) {
+    if (isset($_GET['invoice_key'])) {
+        $invoice_key = urldecode($_GET['invoice_key']);
+    } else if ($session && isset($session['invoice_key'])) {
         $invoice_key = $session['invoice_key'];
-    } elseif ( isset( $wpinv_receipt_args['invoice_key'] ) && $wpinv_receipt_args['invoice_key'] ) {
+    } elseif (isset($wpinv_receipt_args['invoice_key']) && $wpinv_receipt_args['invoice_key']) {
         $invoice_key = $wpinv_receipt_args['invoice_key'];
-    } else if ( isset( $_GET['invoice-id'] ) ) {
-        $invoice_key = wpinv_get_payment_key( (int)$_GET['invoice-id'] );
+    } else if (isset($_GET['invoice-id'])) {
+        $invoice_key = wpinv_get_payment_key((int) $_GET['invoice-id']);
     }
 
     // No key found
-    if ( ! isset( $invoice_key ) ) {
+    if (!isset($invoice_key)) {
         return '<p class="alert alert-error">' . $wpinv_receipt_args['error'] . '</p>';
     }
 
-    $invoice_id    = wpinv_get_invoice_id_by_key( $invoice_key );
-    $user_can_view = wpinv_can_view_receipt( $invoice_key );
-    if ( $user_can_view && isset( $_GET['invoice-id'] ) ) {
-        $invoice_id     = (int)$_GET['invoice-id'];
-        $user_can_view  = $invoice_key == wpinv_get_payment_key( (int)$_GET['invoice-id'] ) ? true : false;
+    $invoice_id    = wpinv_get_invoice_id_by_key($invoice_key);
+    $user_can_view = wpinv_can_view_receipt($invoice_key);
+    if ($user_can_view && isset($_GET['invoice-id'])) {
+        $invoice_id     = (int) $_GET['invoice-id'];
+        $user_can_view  = $invoice_key == wpinv_get_payment_key((int) $_GET['invoice-id']) ? true : false;
     }
 
     // Key was provided, but user is logged out. Offer them the ability to login and view the receipt
-    if ( ! $user_can_view && ! empty( $invoice_key ) && ! is_user_logged_in() ) {
+    if (!$user_can_view && !empty($invoice_key) && !is_user_logged_in()) {
         // login redirect
-        return '<p class="alert alert-error">' . __( 'You are not allowed to access this section', 'invoicing' ) . '</p>';
+        return '<p class="alert alert-error">' . __('You are not allowed to access this section', 'invoicing') . '</p>';
     }
 
-    if ( ! apply_filters( 'wpinv_user_can_view_receipt', $user_can_view, $wpinv_receipt_args ) ) {
+    if (!apply_filters('wpinv_user_can_view_receipt', $user_can_view, $wpinv_receipt_args)) {
         return '<p class="alert alert-error">' . $wpinv_receipt_args['error'] . '</p>';
     }
 
     ob_start();
 
-    wpinv_get_template_part( 'wpinv-invoice-receipt' );
+    wpinv_get_template_part('wpinv-invoice-receipt');
 
     $display = ob_get_clean();
 
     return $display;
 }
 
-function wpinv_get_invoice_id_by_key( $key ) {
+function wpinv_get_invoice_id_by_key($key) {
 	global $wpdb;
 
-	$invoice_id = $wpdb->get_var( $wpdb->prepare( "SELECT post_id FROM $wpdb->postmeta WHERE meta_key = '_wpinv_key' AND meta_value = %s LIMIT 1", $key ) );
+	$invoice_id = $wpdb->get_var($wpdb->prepare("SELECT post_id FROM $wpdb->postmeta WHERE meta_key = '_wpinv_key' AND meta_value = %s LIMIT 1", $key));
 
-	if ( $invoice_id != NULL )
+	if ($invoice_id != NULL)
 		return $invoice_id;
 
 	return 0;
 }
 
-function wpinv_can_view_receipt( $invoice_key = '' ) {
+function wpinv_can_view_receipt($invoice_key = '') {
 	$return = false;
 
-	if ( empty( $invoice_key ) ) {
+	if (empty($invoice_key)) {
 		return $return;
 	}
 
 	global $wpinv_receipt_args;
 
-	$wpinv_receipt_args['id'] = wpinv_get_invoice_id_by_key( $invoice_key );
-	if ( isset( $_GET['invoice-id'] ) ) {
-		$wpinv_receipt_args['id'] = $invoice_key == wpinv_get_payment_key( (int)$_GET['invoice-id'] ) ? (int)$_GET['invoice-id'] : 0;
+	$wpinv_receipt_args['id'] = wpinv_get_invoice_id_by_key($invoice_key);
+	if (isset($_GET['invoice-id'])) {
+		$wpinv_receipt_args['id'] = $invoice_key == wpinv_get_payment_key((int) $_GET['invoice-id']) ? (int) $_GET['invoice-id'] : 0;
 	}
 
-	if ( empty( $wpinv_receipt_args['id'] ) ) {
+	if (empty($wpinv_receipt_args['id'])) {
 		return $return;
 	}
 
-	$invoice = wpinv_get_invoice( $wpinv_receipt_args['id'] );
-	if ( !( !empty( $invoice->ID ) && $invoice->get_key() === $invoice_key ) ) {
+	$invoice = wpinv_get_invoice($wpinv_receipt_args['id']);
+	if (!(!empty($invoice->ID) && $invoice->get_key() === $invoice_key)) {
 		return $return;
 	}
 
-	if ( is_user_logged_in() ) {
-		if ( (int)$invoice->get_user_id() === (int) get_current_user_id() ) {
+	if (is_user_logged_in()) {
+		if ((int) $invoice->get_user_id() === (int) get_current_user_id()) {
 			$return = true;
 		}
 	}
 
 	$session = wpinv_get_checkout_session();
-	if ( isset( $_GET['invoice_key'] ) || ( $session && isset( $session['invoice_key'] ) ) ) {
-		$check_key = isset( $_GET['invoice_key'] ) ? $_GET['invoice_key'] : $session['invoice_key'];
+	if (isset($_GET['invoice_key']) || ($session && isset($session['invoice_key']))) {
+		$check_key = isset($_GET['invoice_key']) ? $_GET['invoice_key'] : $session['invoice_key'];
 
-		if ( wpinv_require_login_to_checkout() ) {
+		if (wpinv_require_login_to_checkout()) {
 			$return = $return && $check_key === $invoice_key;
 		} else {
 			$return = $check_key === $invoice_key;
 		}
 	}
 
-	return (bool) apply_filters( 'wpinv_can_view_receipt', $return, $invoice_key );
+	return (bool) apply_filters('wpinv_can_view_receipt', $return, $invoice_key);
 }
 
 function wpinv_pay_for_invoice() {
     global $wpinv_euvat;
     
-    if ( isset( $_GET['invoice_key'] ) ) {
+    if (isset($_GET['invoice_key'])) {
         $checkout_uri   = wpinv_get_checkout_uri();
-        $invoice_key    = sanitize_text_field( $_GET['invoice_key'] );
+        $invoice_key    = sanitize_text_field($_GET['invoice_key']);
         
-        if ( empty( $invoice_key ) ) {
-            wpinv_set_error( 'invalid_invoice', __( 'Invoice not found', 'invoicing' ) );
-            wp_redirect( $checkout_uri );
+        if (empty($invoice_key)) {
+            wpinv_set_error('invalid_invoice', __('Invoice not found', 'invoicing'));
+            wp_redirect($checkout_uri);
             exit();
         }
         
-        do_action( 'wpinv_check_pay_for_invoice', $invoice_key );
+        do_action('wpinv_check_pay_for_invoice', $invoice_key);
 
-        $invoice_id    = wpinv_get_invoice_id_by_key( $invoice_key );
-        $user_can_view = wpinv_can_view_receipt( $invoice_key );
-        if ( $user_can_view && isset( $_GET['invoice-id'] ) ) {
-            $invoice_id     = (int)$_GET['invoice-id'];
-            $user_can_view  = $invoice_key == wpinv_get_payment_key( (int)$_GET['invoice-id'] ) ? true : false;
+        $invoice_id    = wpinv_get_invoice_id_by_key($invoice_key);
+        $user_can_view = wpinv_can_view_receipt($invoice_key);
+        if ($user_can_view && isset($_GET['invoice-id'])) {
+            $invoice_id     = (int) $_GET['invoice-id'];
+            $user_can_view  = $invoice_key == wpinv_get_payment_key((int) $_GET['invoice-id']) ? true : false;
         }
         
-        if ( $invoice_id && $user_can_view && ( $invoice = wpinv_get_invoice( $invoice_id ) ) ) {
-            if ( $invoice->needs_payment() ) {
+        if ($invoice_id && $user_can_view && ($invoice = wpinv_get_invoice($invoice_id))) {
+            if ($invoice->needs_payment()) {
                 $data                   = array();
                 $data['invoice_id']     = $invoice_id;
-                $data['cart_discounts'] = $invoice->get_discounts( true );
+                $data['cart_discounts'] = $invoice->get_discounts(true);
                 
-                wpinv_set_checkout_session( $data );
+                wpinv_set_checkout_session($data);
                 
-                if ( wpinv_get_option( 'vat_ip_country_default' ) ) {
+                if (wpinv_get_option('vat_ip_country_default')) {
                     $_POST['country']   = $wpinv_euvat->get_country_by_ip();
                     $_POST['state']     = $_POST['country'] == $invoice->country ? $invoice->state : '';
                     
-                    wpinv_recalculate_tax( true );
+                    wpinv_recalculate_tax(true);
                 }
                 
             } else {
                 $checkout_uri = $invoice->get_view_url();
             }
         } else {
-            wpinv_set_error( 'invalid_invoice', __( 'You are not allowed to view this invoice', 'invoicing' ) );
+            wpinv_set_error('invalid_invoice', __('You are not allowed to view this invoice', 'invoicing'));
             
-            $checkout_uri = is_user_logged_in() ? wpinv_get_history_page_uri() : wp_login_url( get_permalink() );
+            $checkout_uri = is_user_logged_in() ? wpinv_get_history_page_uri() : wp_login_url(get_permalink());
         }
         
-        if(wp_redirect( $checkout_uri )){
+        if (wp_redirect($checkout_uri)) {
             exit;
         };
         wpinv_die();
     }
 }
-add_action( 'wpinv_pay_for_invoice', 'wpinv_pay_for_invoice' );
+add_action('wpinv_pay_for_invoice', 'wpinv_pay_for_invoice');
 
-function wpinv_handle_pay_via_invoice_link( $invoice_key ) {
-    if ( !empty( $invoice_key ) && !empty( $_REQUEST['_wpipay'] ) && !is_user_logged_in() && $invoice_id = wpinv_get_invoice_id_by_key( $invoice_key ) ) {
-        if ( $invoice = wpinv_get_invoice( $invoice_id ) ) {
+function wpinv_handle_pay_via_invoice_link($invoice_key) {
+    if (!empty($invoice_key) && !empty($_REQUEST['_wpipay']) && !is_user_logged_in() && $invoice_id = wpinv_get_invoice_id_by_key($invoice_key)) {
+        if ($invoice = wpinv_get_invoice($invoice_id)) {
             $user_id = $invoice->get_user_id();
-            $secret = sanitize_text_field( $_GET['_wpipay'] );
+            $secret = sanitize_text_field($_GET['_wpipay']);
             
-            if ( $secret === md5( $user_id . '::' . $invoice->get_email() . '::' . $invoice_key ) ) { // valid invoice link
-                $redirect_to = remove_query_arg( '_wpipay', get_permalink() );
+            if ($secret === md5($user_id . '::' . $invoice->get_email() . '::' . $invoice_key)) { // valid invoice link
+                $redirect_to = remove_query_arg('_wpipay', get_permalink());
                 
-                wpinv_guest_redirect( $redirect_to, $user_id );
+                wpinv_guest_redirect($redirect_to, $user_id);
                 exit();
             }
         }
     }
 }
-add_action( 'wpinv_check_pay_for_invoice', 'wpinv_handle_pay_via_invoice_link' );
+add_action('wpinv_check_pay_for_invoice', 'wpinv_handle_pay_via_invoice_link');
 
-function wpinv_set_payment_transaction_id( $invoice_id = 0, $transaction_id = '' ) {
-    $invoice_id = is_object( $invoice_id ) && !empty( $invoice_id->ID ) ? $invoice_id : $invoice_id;
+function wpinv_set_payment_transaction_id($invoice_id = 0, $transaction_id = '') {
+    $invoice_id = is_object($invoice_id) && !empty($invoice_id->ID) ? $invoice_id : $invoice_id;
     
-    if ( empty( $invoice_id ) && $invoice_id > 0 ) {
+    if (empty($invoice_id) && $invoice_id > 0) {
         return false;
     }
     
-    if ( empty( $transaction_id ) ) {
+    if (empty($transaction_id)) {
         $transaction_id = $invoice_id;
     }
 
-    $transaction_id = apply_filters( 'wpinv_set_payment_transaction_id', $transaction_id, $invoice_id );
+    $transaction_id = apply_filters('wpinv_set_payment_transaction_id', $transaction_id, $invoice_id);
     
-    return wpinv_update_invoice_meta( $invoice_id, '_wpinv_transaction_id', $transaction_id );
+    return wpinv_update_invoice_meta($invoice_id, '_wpinv_transaction_id', $transaction_id);
 }
 
-function wpinv_invoice_status_label( $status, $status_display = '' ) {
-    if ( empty( $status_display ) ) {
-        $status_display = wpinv_status_nicename( $status );
+function wpinv_invoice_status_label($status, $status_display = '') {
+    if (empty($status_display)) {
+        $status_display = wpinv_status_nicename($status);
     }
     
-    switch ( $status ) {
+    switch ($status) {
         case 'publish' :
         case 'wpi-renewal' :
             $class = 'label-success';
@@ -2106,201 +2106,201 @@ 
     
     $label = '<span class="label label-inv-' . $status . ' ' . $class . '">' . $status_display . '</span>';
     
-    return apply_filters( 'wpinv_invoice_status_label', $label, $status, $status_display );
+    return apply_filters('wpinv_invoice_status_label', $label, $status, $status_display);
 }
 
-function wpinv_format_invoice_number( $number, $type = '' ) {
-    $check = apply_filters( 'wpinv_pre_format_invoice_number', null, $number, $type );
-    if ( null !== $check ) {
+function wpinv_format_invoice_number($number, $type = '') {
+    $check = apply_filters('wpinv_pre_format_invoice_number', null, $number, $type);
+    if (null !== $check) {
         return $check;
     }
 
-    if ( !empty( $number ) && !is_numeric( $number ) ) {
+    if (!empty($number) && !is_numeric($number)) {
         return $number;
     }
 
-    $padd  = wpinv_get_option( 'invoice_number_padd' );
-    $prefix  = wpinv_get_option( 'invoice_number_prefix' );
-    $postfix = wpinv_get_option( 'invoice_number_postfix' );
+    $padd = wpinv_get_option('invoice_number_padd');
+    $prefix  = wpinv_get_option('invoice_number_prefix');
+    $postfix = wpinv_get_option('invoice_number_postfix');
     
-    $padd = absint( $padd );
-    $formatted_number = absint( $number );
+    $padd = absint($padd);
+    $formatted_number = absint($number);
     
-    if ( $padd > 0 ) {
-        $formatted_number = zeroise( $formatted_number, $padd );
+    if ($padd > 0) {
+        $formatted_number = zeroise($formatted_number, $padd);
     }    
 
     $formatted_number = $prefix . $formatted_number . $postfix;
 
-    return apply_filters( 'wpinv_format_invoice_number', $formatted_number, $number, $prefix, $postfix, $padd );
+    return apply_filters('wpinv_format_invoice_number', $formatted_number, $number, $prefix, $postfix, $padd);
 }
 
-function wpinv_get_next_invoice_number( $type = '' ) {
-    $check = apply_filters( 'wpinv_get_pre_next_invoice_number', null, $type );
-    if ( null !== $check ) {
+function wpinv_get_next_invoice_number($type = '') {
+    $check = apply_filters('wpinv_get_pre_next_invoice_number', null, $type);
+    if (null !== $check) {
         return $check;
     }
     
-    if ( !wpinv_sequential_number_active() ) {
+    if (!wpinv_sequential_number_active()) {
         return false;
     }
 
-    $number = $last_number = get_option( 'wpinv_last_invoice_number', 0 );
-    $start  = wpinv_get_option( 'invoice_sequence_start', 1 );
-    if ( !absint( $start ) > 0 ) {
+    $number = $last_number = get_option('wpinv_last_invoice_number', 0);
+    $start  = wpinv_get_option('invoice_sequence_start', 1);
+    if (!absint($start) > 0) {
         $start = 1;
     }
     $increment_number = true;
     $save_number = false;
 
-    if ( !empty( $number ) && !is_numeric( $number ) && $number == wpinv_format_invoice_number( $number ) ) {
-        $number = wpinv_clean_invoice_number( $number );
+    if (!empty($number) && !is_numeric($number) && $number == wpinv_format_invoice_number($number)) {
+        $number = wpinv_clean_invoice_number($number);
     }
 
-    if ( empty( $number ) ) {
-        if ( !( $last_number === 0 || $last_number === '0' ) ) {
-            $last_invoice = wpinv_get_invoices( array( 'limit' => 1, 'order' => 'DESC', 'orderby' => 'ID', 'return' => 'posts', 'fields' => 'ids', 'status' => array_keys( wpinv_get_invoice_statuses( true, true ) ) ) );
+    if (empty($number)) {
+        if (!($last_number === 0 || $last_number === '0')) {
+            $last_invoice = wpinv_get_invoices(array('limit' => 1, 'order' => 'DESC', 'orderby' => 'ID', 'return' => 'posts', 'fields' => 'ids', 'status' => array_keys(wpinv_get_invoice_statuses(true, true))));
 
-            if ( !empty( $last_invoice[0] ) && $invoice_number = wpinv_get_invoice_number( $last_invoice[0] ) ) {
-                if ( is_numeric( $invoice_number ) ) {
+            if (!empty($last_invoice[0]) && $invoice_number = wpinv_get_invoice_number($last_invoice[0])) {
+                if (is_numeric($invoice_number)) {
                     $number = $invoice_number;
                 } else {
-                    $number = wpinv_clean_invoice_number( $invoice_number );
+                    $number = wpinv_clean_invoice_number($invoice_number);
                 }
             }
 
-            if ( empty( $number ) ) {
+            if (empty($number)) {
                 $increment_number = false;
                 $number = $start;
-                $save_number = ( $number - 1 );
+                $save_number = ($number - 1);
             } else {
                 $save_number = $number;
             }
         }
     }
 
-    if ( $start > $number ) {
+    if ($start > $number) {
         $increment_number = false;
         $number = $start;
-        $save_number = ( $number - 1 );
+        $save_number = ($number - 1);
     }
 
-    if ( $save_number !== false ) {
-        update_option( 'wpinv_last_invoice_number', $save_number );
+    if ($save_number !== false) {
+        update_option('wpinv_last_invoice_number', $save_number);
     }
     
-    $increment_number = apply_filters( 'wpinv_increment_payment_number', $increment_number, $number );
+    $increment_number = apply_filters('wpinv_increment_payment_number', $increment_number, $number);
 
-    if ( $increment_number ) {
+    if ($increment_number) {
         $number++;
     }
 
-    return apply_filters( 'wpinv_get_next_invoice_number', $number );
+    return apply_filters('wpinv_get_next_invoice_number', $number);
 }
 
-function wpinv_clean_invoice_number( $number, $type = '' ) {
-    $check = apply_filters( 'wpinv_pre_clean_invoice_number', null, $number, $type );
-    if ( null !== $check ) {
+function wpinv_clean_invoice_number($number, $type = '') {
+    $check = apply_filters('wpinv_pre_clean_invoice_number', null, $number, $type);
+    if (null !== $check) {
         return $check;
     }
     
-    $prefix  = wpinv_get_option( 'invoice_number_prefix' );
-    $postfix = wpinv_get_option( 'invoice_number_postfix' );
+    $prefix  = wpinv_get_option('invoice_number_prefix');
+    $postfix = wpinv_get_option('invoice_number_postfix');
 
-    $number = preg_replace( '/' . $prefix . '/', '', $number, 1 );
+    $number = preg_replace('/' . $prefix . '/', '', $number, 1);
 
-    $length      = strlen( $number );
-    $postfix_pos = strrpos( $number, $postfix );
+    $length      = strlen($number);
+    $postfix_pos = strrpos($number, $postfix);
     
-    if ( false !== $postfix_pos ) {
-        $number      = substr_replace( $number, '', $postfix_pos, $length );
+    if (false !== $postfix_pos) {
+        $number = substr_replace($number, '', $postfix_pos, $length);
     }
 
-    $number = intval( $number );
+    $number = intval($number);
 
-    return apply_filters( 'wpinv_clean_invoice_number', $number, $prefix, $postfix );
+    return apply_filters('wpinv_clean_invoice_number', $number, $prefix, $postfix);
 }
 
-function wpinv_save_number_post_saved( $post_ID, $post, $update ) {
+function wpinv_save_number_post_saved($post_ID, $post, $update) {
     global $wpdb;
 
-    if ( !$update && !get_post_meta( $post_ID, '_wpinv_number', true ) ) {
-        wpinv_update_invoice_number( $post_ID, $post->post_status != 'auto-draft', $post->post_type );
+    if (!$update && !get_post_meta($post_ID, '_wpinv_number', true)) {
+        wpinv_update_invoice_number($post_ID, $post->post_status != 'auto-draft', $post->post_type);
     }
 
-    if ( !$update ) {
-        $wpdb->update( $wpdb->posts, array( 'post_name' => wpinv_generate_post_name( $post_ID ) ), array( 'ID' => $post_ID ) );
-        clean_post_cache( $post_ID );
+    if (!$update) {
+        $wpdb->update($wpdb->posts, array('post_name' => wpinv_generate_post_name($post_ID)), array('ID' => $post_ID));
+        clean_post_cache($post_ID);
     }
 }
-add_action( 'save_post_wpi_invoice', 'wpinv_save_number_post_saved', 1, 3 );
+add_action('save_post_wpi_invoice', 'wpinv_save_number_post_saved', 1, 3);
 
-function wpinv_save_number_post_updated( $post_ID, $post_after, $post_before ) {
-    if ( !empty( $post_after->post_type ) && $post_after->post_type == 'wpi_invoice' && $post_before->post_status == 'auto-draft' && $post_after->post_status != $post_before->post_status ) {
-        wpinv_update_invoice_number( $post_ID, true, $post_after->post_type );
+function wpinv_save_number_post_updated($post_ID, $post_after, $post_before) {
+    if (!empty($post_after->post_type) && $post_after->post_type == 'wpi_invoice' && $post_before->post_status == 'auto-draft' && $post_after->post_status != $post_before->post_status) {
+        wpinv_update_invoice_number($post_ID, true, $post_after->post_type);
     }
 }
-add_action( 'post_updated', 'wpinv_save_number_post_updated', 1, 3 );
+add_action('post_updated', 'wpinv_save_number_post_updated', 1, 3);
 
-function wpinv_update_invoice_number( $post_ID, $save_sequential = false, $type = '' ) {
+function wpinv_update_invoice_number($post_ID, $save_sequential = false, $type = '') {
     global $wpdb;
     
-    $check = apply_filters( 'wpinv_pre_update_invoice_number', null, $post_ID, $save_sequential, $type );
-    if ( null !== $check ) {
+    $check = apply_filters('wpinv_pre_update_invoice_number', null, $post_ID, $save_sequential, $type);
+    if (null !== $check) {
         return $check;
     }
 
-    if ( wpinv_sequential_number_active() ) {
+    if (wpinv_sequential_number_active()) {
         $number = wpinv_get_next_invoice_number();
 
-        if ( $save_sequential ) {
-            update_option( 'wpinv_last_invoice_number', $number );
+        if ($save_sequential) {
+            update_option('wpinv_last_invoice_number', $number);
         }
     } else {
         $number = $post_ID;
     }
 
-    $number = wpinv_format_invoice_number( $number );
+    $number = wpinv_format_invoice_number($number);
 
-    update_post_meta( $post_ID, '_wpinv_number', $number );
+    update_post_meta($post_ID, '_wpinv_number', $number);
 
-    $wpdb->update( $wpdb->posts, array( 'post_title' => $number ), array( 'ID' => $post_ID ) );
+    $wpdb->update($wpdb->posts, array('post_title' => $number), array('ID' => $post_ID));
 
-    clean_post_cache( $post_ID );
+    clean_post_cache($post_ID);
 
     return $number;
 }
 
-function wpinv_post_name_prefix( $post_type = 'wpi_invoice' ) {
-    return apply_filters( 'wpinv_post_name_prefix', 'inv-', $post_type );
+function wpinv_post_name_prefix($post_type = 'wpi_invoice') {
+    return apply_filters('wpinv_post_name_prefix', 'inv-', $post_type);
 }
 
-function wpinv_generate_post_name( $post_ID ) {
-    $prefix = wpinv_post_name_prefix( get_post_type( $post_ID ) );
-    $post_name = sanitize_title( $prefix . $post_ID );
+function wpinv_generate_post_name($post_ID) {
+    $prefix = wpinv_post_name_prefix(get_post_type($post_ID));
+    $post_name = sanitize_title($prefix . $post_ID);
 
-    return apply_filters( 'wpinv_generate_post_name', $post_name, $post_ID, $prefix );
+    return apply_filters('wpinv_generate_post_name', $post_name, $post_ID, $prefix);
 }
 
-function wpinv_is_invoice_viewed( $invoice_id ) {
-    if ( empty( $invoice_id ) ) {
+function wpinv_is_invoice_viewed($invoice_id) {
+    if (empty($invoice_id)) {
         return false;
     }
 
-    $viewed_meta = get_post_meta( $invoice_id, '_wpinv_is_viewed', true );
+    $viewed_meta = get_post_meta($invoice_id, '_wpinv_is_viewed', true);
 
-    return apply_filters( 'wpinv_is_invoice_viewed', 1 === (int)$viewed_meta, $invoice_id );
+    return apply_filters('wpinv_is_invoice_viewed', 1 === (int) $viewed_meta, $invoice_id);
 }
 
 function wpinv_mark_invoice_viewed() {
 
-    if ( isset( $_GET['invoice_key'] ) || is_singular( 'wpi_invoice' ) || is_singular( 'wpi_quote' ) ) {
-        $invoice_key = isset( $_GET['invoice_key'] ) ? urldecode($_GET['invoice_key']) : '';
+    if (isset($_GET['invoice_key']) || is_singular('wpi_invoice') || is_singular('wpi_quote')) {
+        $invoice_key = isset($_GET['invoice_key']) ? urldecode($_GET['invoice_key']) : '';
 	    global $post;
 
-        if(!empty($invoice_key)){
+        if (!empty($invoice_key)) {
 	        $invoice_id = wpinv_get_invoice_id_by_key($invoice_key);
-        } else if(!empty( $post ) && ($post->post_type == 'wpi_invoice' || $post->post_type == 'wpi_quote')) {
+        } else if (!empty($post) && ($post->post_type == 'wpi_invoice' || $post->post_type == 'wpi_quote')) {
 			$invoice_id = $post->ID;
         } else {
         	return;
@@ -2308,60 +2308,60 @@ 
 
         $invoice = new WPInv_Invoice($invoice_id);
 
-        if(!$invoice_id){
+        if (!$invoice_id) {
             return;
         }
 
-	    if ( is_user_logged_in() ) {
-		    if ( (int)$invoice->get_user_id() === get_current_user_id() ) {
-			    update_post_meta($invoice_id,'_wpinv_is_viewed', 1);
-		    } else if ( !wpinv_require_login_to_checkout() && isset( $_GET['invoice_key'] ) && $_GET['invoice_key'] === $invoice->get_key() ) {
-			    update_post_meta($invoice_id,'_wpinv_is_viewed', 1);
+	    if (is_user_logged_in()) {
+		    if ((int) $invoice->get_user_id() === get_current_user_id()) {
+			    update_post_meta($invoice_id, '_wpinv_is_viewed', 1);
+		    } else if (!wpinv_require_login_to_checkout() && isset($_GET['invoice_key']) && $_GET['invoice_key'] === $invoice->get_key()) {
+			    update_post_meta($invoice_id, '_wpinv_is_viewed', 1);
 		    }
 	    } else {
-		    if ( !wpinv_require_login_to_checkout() && isset( $_GET['invoice_key'] ) && $_GET['invoice_key'] === $invoice->get_key() ) {
-			    update_post_meta($invoice_id,'_wpinv_is_viewed', 1);
+		    if (!wpinv_require_login_to_checkout() && isset($_GET['invoice_key']) && $_GET['invoice_key'] === $invoice->get_key()) {
+			    update_post_meta($invoice_id, '_wpinv_is_viewed', 1);
 		    }
 	    }
     }
 
 }
-add_action( 'template_redirect', 'wpinv_mark_invoice_viewed' );
+add_action('template_redirect', 'wpinv_mark_invoice_viewed');
 
-function wpinv_get_subscription( $invoice, $by_parent = false ) {
-    if ( empty( $invoice ) ) {
+function wpinv_get_subscription($invoice, $by_parent = false) {
+    if (empty($invoice)) {
         return false;
     }
     
-    if ( ! is_object( $invoice ) && is_scalar( $invoice ) ) {
-        $invoice = wpinv_get_invoice( $invoice );
+    if (!is_object($invoice) && is_scalar($invoice)) {
+        $invoice = wpinv_get_invoice($invoice);
     }
     
-    if ( !( is_object( $invoice ) && ! empty( $invoice->ID ) && $invoice->is_recurring() ) ) {
+    if (!(is_object($invoice) && !empty($invoice->ID) && $invoice->is_recurring())) {
         return false;
     }
     
-    $invoice_id = ! $by_parent && ! empty( $invoice->parent_invoice ) ? $invoice->parent_invoice : $invoice->ID;
+    $invoice_id = !$by_parent && !empty($invoice->parent_invoice) ? $invoice->parent_invoice : $invoice->ID;
     
     $subs_db    = new WPInv_Subscriptions_DB;
-    $subs       = $subs_db->get_subscriptions( array( 'parent_payment_id' => $invoice_id, 'number' => 1 ) );
+    $subs       = $subs_db->get_subscriptions(array('parent_payment_id' => $invoice_id, 'number' => 1));
     
-    if ( ! empty( $subs ) ) {
-        return reset( $subs );
+    if (!empty($subs)) {
+        return reset($subs);
     }
     
     return false;
 }
 
-function wpinv_filter_posts_clauses( $clauses, $wp_query ) {
+function wpinv_filter_posts_clauses($clauses, $wp_query) {
     global $wpdb;
 
-    if ( ! empty( $wp_query->query_vars['orderby'] ) && $wp_query->query_vars['orderby'] == 'invoice_date' ) {
-        if ( !empty( $clauses['join'] ) ) {
+    if (!empty($wp_query->query_vars['orderby']) && $wp_query->query_vars['orderby'] == 'invoice_date') {
+        if (!empty($clauses['join'])) {
             $clauses['join'] .= " ";
         }
 
-        if ( !empty( $clauses['fields'] ) ) {
+        if (!empty($clauses['fields'])) {
             $clauses['fields'] .= ", ";
         }
 
@@ -2372,4 +2372,4 @@ 
 
     return $clauses;
 }
-add_filter( 'posts_clauses', 'wpinv_filter_posts_clauses', 10, 2 );
\ No newline at end of file
+add_filter('posts_clauses', 'wpinv_filter_posts_clauses', 10, 2);
\ No newline at end of file

includes/class-wpinv-invoice.php

Spacing +619 added lines, -619 removed lines

@@ -7,12 +7,12 @@ 
  */
  
 // MUST have WordPress.
-if ( !defined( 'WPINC' ) ) {
-    exit( 'Do NOT access this file directly: ' . basename( __FILE__ ) );
+if (!defined('WPINC')) {
+    exit('Do NOT access this file directly: ' . basename(__FILE__));
 }
 
 final class WPInv_Invoice {
-    public $ID  = 0;
+    public $ID = 0;
     public $title;
     public $post_type;
     
@@ -65,17 +65,17 @@ 
     public $full_name = '';
     public $parent_invoice = 0;
     
-    public function __construct( $invoice_id = false ) {
-        if( empty( $invoice_id ) ) {
+    public function __construct($invoice_id = false) {
+        if (empty($invoice_id)) {
             return false;
         }
 
-        $this->setup_invoice( $invoice_id );
+        $this->setup_invoice($invoice_id);
     }
 
-    public function get( $key ) {
-        if ( method_exists( $this, 'get_' . $key ) ) {
-            $value = call_user_func( array( $this, 'get_' . $key ) );
+    public function get($key) {
+        if (method_exists($this, 'get_' . $key)) {
+            $value = call_user_func(array($this, 'get_' . $key));
         } else {
             $value = $this->$key;
         }
@@ -83,51 +83,51 @@ 
         return $value;
     }
 
-    public function set( $key, $value ) {
-        $ignore = array( 'items', 'cart_details', 'fees', '_ID' );
+    public function set($key, $value) {
+        $ignore = array('items', 'cart_details', 'fees', '_ID');
 
-        if ( $key === 'status' ) {
+        if ($key === 'status') {
             $this->old_status = $this->status;
         }
 
-        if ( ! in_array( $key, $ignore ) ) {
-            $this->pending[ $key ] = $value;
+        if (!in_array($key, $ignore)) {
+            $this->pending[$key] = $value;
         }
 
-        if( '_ID' !== $key ) {
+        if ('_ID' !== $key) {
             $this->$key = $value;
         }
     }
 
-    public function _isset( $name ) {
-        if ( property_exists( $this, $name) ) {
-            return false === empty( $this->$name );
+    public function _isset($name) {
+        if (property_exists($this, $name)) {
+            return false === empty($this->$name);
         } else {
             return null;
         }
     }
 
-    private function setup_invoice( $invoice_id ) {
+    private function setup_invoice($invoice_id) {
         $this->pending = array();
 
-        if ( empty( $invoice_id ) ) {
+        if (empty($invoice_id)) {
             return false;
         }
 
-        $invoice = get_post( $invoice_id );
+        $invoice = get_post($invoice_id);
 
-        if( !$invoice || is_wp_error( $invoice ) ) {
+        if (!$invoice || is_wp_error($invoice)) {
             return false;
         }
 
-        if( !('wpi_invoice' == $invoice->post_type OR 'wpi_quote' == $invoice->post_type) ) {
+        if (!('wpi_invoice' == $invoice->post_type OR 'wpi_quote' == $invoice->post_type)) {
             return false;
         }
 
-        do_action( 'wpinv_pre_setup_invoice', $this, $invoice_id );
+        do_action('wpinv_pre_setup_invoice', $this, $invoice_id);
         
         // Primary Identifier
-        $this->ID              = absint( $invoice_id );
+        $this->ID              = absint($invoice_id);
         $this->post_type       = $invoice->post_type;
         
         // We have a payment, get the generic payment_meta item to reduce calls to it
@@ -139,7 +139,7 @@ 
         $this->post_status     = $this->status;
         $this->mode            = $this->setup_mode();
         $this->parent_invoice  = $invoice->post_parent;
-        $this->post_name       = $this->setup_post_name( $invoice );
+        $this->post_name       = $this->setup_post_name($invoice);
         $this->status_nicename = $this->setup_status_nicename($invoice->post_status);
 
         // Items
@@ -161,8 +161,8 @@ 
         
         // User based
         $this->ip              = $this->setup_ip();
-        $this->user_id         = !empty( $invoice->post_author ) ? $invoice->post_author : get_current_user_id();///$this->setup_user_id();
-        $this->email           = get_the_author_meta( 'email', $this->user_id );
+        $this->user_id         = !empty($invoice->post_author) ? $invoice->post_author : get_current_user_id(); ///$this->setup_user_id();
+        $this->email           = get_the_author_meta('email', $this->user_id);
         
         $this->user_info       = $this->setup_user_info();
                 
@@ -171,7 +171,7 @@ 
         $this->company         = $this->user_info['company'];
         $this->vat_number      = $this->user_info['vat_number'];
         $this->vat_rate        = $this->user_info['vat_rate'];
-        $this->adddress_confirmed  = $this->user_info['adddress_confirmed'];
+        $this->adddress_confirmed = $this->user_info['adddress_confirmed'];
         $this->address         = $this->user_info['address'];
         $this->city            = $this->user_info['city'];
         $this->country         = $this->user_info['country'];
@@ -186,39 +186,39 @@ 
         // Other Identifiers
         $this->key             = $this->setup_invoice_key();
         $this->number          = $this->setup_invoice_number();
-        $this->title           = !empty( $invoice->post_title ) ? $invoice->post_title : $this->number;
+        $this->title           = !empty($invoice->post_title) ? $invoice->post_title : $this->number;
         
-        $this->full_name       = trim( $this->first_name . ' '. $this->last_name );
+        $this->full_name       = trim($this->first_name . ' ' . $this->last_name);
         
         // Allow extensions to add items to this object via hook
-        do_action( 'wpinv_setup_invoice', $this, $invoice_id );
+        do_action('wpinv_setup_invoice', $this, $invoice_id);
 
         return true;
     }
     
-    private function setup_status_nicename( $status ) {
-        $all_invoice_statuses  = wpinv_get_invoice_statuses( true, true, $this );
+    private function setup_status_nicename($status) {
+        $all_invoice_statuses = wpinv_get_invoice_statuses(true, true, $this);
 
-        if ( $this->is_quote() && class_exists( 'Wpinv_Quotes_Shared' ) ) {
-            $all_invoice_statuses  = Wpinv_Quotes_Shared::wpinv_get_quote_statuses();
+        if ($this->is_quote() && class_exists('Wpinv_Quotes_Shared')) {
+            $all_invoice_statuses = Wpinv_Quotes_Shared::wpinv_get_quote_statuses();
         }
-        $status   = isset( $all_invoice_statuses[$status] ) ? $all_invoice_statuses[$status] : __( $status, 'invoicing' );
+        $status = isset($all_invoice_statuses[$status]) ? $all_invoice_statuses[$status] : __($status, 'invoicing');
 
-        return apply_filters( 'setup_status_nicename', $status );
+        return apply_filters('setup_status_nicename', $status);
     }
     
-    private function setup_post_name( $post = NULL ) {
+    private function setup_post_name($post = NULL) {
         global $wpdb;
         
         $post_name = '';
         
-        if ( !empty( $post ) ) {
-            if( !empty( $post->post_name ) ) {
+        if (!empty($post)) {
+            if (!empty($post->post_name)) {
                 $post_name = $post->post_name;
-            } else if ( !empty( $post->ID ) ) {
-                $post_name = wpinv_generate_post_name( $post->ID );
+            } else if (!empty($post->ID)) {
+                $post_name = wpinv_generate_post_name($post->ID);
 
-                $wpdb->update( $wpdb->posts, array( 'post_name' => $post_name ), array( 'ID' => $post->ID ) );
+                $wpdb->update($wpdb->posts, array('post_name' => $post_name), array('ID' => $post->ID));
             }
         }
 
@@ -226,12 +226,12 @@ 
     }
     
     private function setup_due_date() {
-        $due_date = $this->get_meta( '_wpinv_due_date' );
+        $due_date = $this->get_meta('_wpinv_due_date');
         
-        if ( empty( $due_date ) ) {
-            $overdue_time = strtotime( $this->date ) + ( DAY_IN_SECONDS * absint( wpinv_get_option( 'overdue_days' ) ) );
-            $due_date = date_i18n( 'Y-m-d', $overdue_time );
-        } else if ( $due_date == 'none' ) {
+        if (empty($due_date)) {
+            $overdue_time = strtotime($this->date) + (DAY_IN_SECONDS * absint(wpinv_get_option('overdue_days')));
+            $due_date = date_i18n('Y-m-d', $overdue_time);
+        } else if ($due_date == 'none') {
             $due_date = '';
         }
         
@@ -239,66 +239,66 @@ 
     }
     
     private function setup_completed_date() {
-        $invoice = get_post( $this->ID );
+        $invoice = get_post($this->ID);
 
-        if ( 'wpi-pending' == $invoice->post_status || 'preapproved' == $invoice->post_status ) {
+        if ('wpi-pending' == $invoice->post_status || 'preapproved' == $invoice->post_status) {
             return false; // This invoice was never paid
         }
 
-        $date = ( $date = $this->get_meta( '_wpinv_completed_date', true ) ) ? $date : $invoice->modified_date;
+        $date = ($date = $this->get_meta('_wpinv_completed_date', true)) ? $date : $invoice->modified_date;
 
         return $date;
     }
     
     private function setup_cart_details() {
-        $cart_details = isset( $this->payment_meta['cart_details'] ) ? maybe_unserialize( $this->payment_meta['cart_details'] ) : array();
+        $cart_details = isset($this->payment_meta['cart_details']) ? maybe_unserialize($this->payment_meta['cart_details']) : array();
         return $cart_details;
     }
     
     public function array_convert() {
-        return get_object_vars( $this );
+        return get_object_vars($this);
     }
     
     private function setup_items() {
-        $items = isset( $this->payment_meta['items'] ) ? maybe_unserialize( $this->payment_meta['items'] ) : array();
+        $items = isset($this->payment_meta['items']) ? maybe_unserialize($this->payment_meta['items']) : array();
         return $items;
     }
     
     private function setup_fees() {
-        $payment_fees = isset( $this->payment_meta['fees'] ) ? $this->payment_meta['fees'] : array();
+        $payment_fees = isset($this->payment_meta['fees']) ? $this->payment_meta['fees'] : array();
         return $payment_fees;
     }
         
     private function setup_currency() {
-        $currency = isset( $this->payment_meta['currency'] ) ? $this->payment_meta['currency'] : apply_filters( 'wpinv_currency_default', wpinv_get_currency(), $this );
+        $currency = isset($this->payment_meta['currency']) ? $this->payment_meta['currency'] : apply_filters('wpinv_currency_default', wpinv_get_currency(), $this);
         return $currency;
     }
     
     private function setup_discount() {
         //$discount = $this->get_meta( '_wpinv_discount', true );
-        $discount = (float)$this->subtotal - ( (float)$this->total - (float)$this->tax - (float)$this->fees_total );
-        if ( $discount < 0 ) {
+        $discount = (float) $this->subtotal - ((float) $this->total - (float) $this->tax - (float) $this->fees_total);
+        if ($discount < 0) {
             $discount = 0;
         }
-        $discount = wpinv_round_amount( $discount );
+        $discount = wpinv_round_amount($discount);
         
         return $discount;
     }
     
     private function setup_discount_code() {
-        $discount_code = !empty( $this->discounts ) ? $this->discounts : $this->get_meta( '_wpinv_discount_code', true );
+        $discount_code = !empty($this->discounts) ? $this->discounts : $this->get_meta('_wpinv_discount_code', true);
         return $discount_code;
     }
     
     private function setup_tax() {
-        $tax = $this->get_meta( '_wpinv_tax', true );
+        $tax = $this->get_meta('_wpinv_tax', true);
 
         // We don't have tax as it's own meta and no meta was passed
-        if ( '' === $tax ) {            
-            $tax = isset( $this->payment_meta['tax'] ) ? $this->payment_meta['tax'] : 0;
+        if ('' === $tax) {            
+            $tax = isset($this->payment_meta['tax']) ? $this->payment_meta['tax'] : 0;
         }
         
-        if ( $tax < 0 ) {
+        if ($tax < 0) {
             $tax = 0;
         }
 
@@ -309,9 +309,9 @@ 
         $subtotal     = 0;
         $cart_details = $this->cart_details;
 
-        if ( is_array( $cart_details ) ) {
-            foreach ( $cart_details as $item ) {
-                if ( isset( $item['subtotal'] ) ) {
+        if (is_array($cart_details)) {
+            foreach ($cart_details as $item) {
+                if (isset($item['subtotal'])) {
                     $subtotal += $item['subtotal'];
                 }
             }
@@ -325,23 +325,23 @@ 
     }
     
     private function setup_discounts() {
-        $discounts = ! empty( $this->payment_meta['user_info']['discount'] ) ? $this->payment_meta['user_info']['discount'] : array();
+        $discounts = !empty($this->payment_meta['user_info']['discount']) ? $this->payment_meta['user_info']['discount'] : array();
         return $discounts;
     }
     
     private function setup_total() {
-        $amount = $this->get_meta( '_wpinv_total', true );
+        $amount = $this->get_meta('_wpinv_total', true);
 
-        if ( empty( $amount ) && '0.00' != $amount ) {
-            $meta   = $this->get_meta( '_wpinv_payment_meta', true );
-            $meta   = maybe_unserialize( $meta );
+        if (empty($amount) && '0.00' != $amount) {
+            $meta   = $this->get_meta('_wpinv_payment_meta', true);
+            $meta   = maybe_unserialize($meta);
 
-            if ( isset( $meta['amount'] ) ) {
+            if (isset($meta['amount'])) {
                 $amount = $meta['amount'];
             }
         }
 
-        if($amount < 0){
+        if ($amount < 0) {
             $amount = 0;
         }
 
@@ -349,13 +349,13 @@ 
     }
     
     private function setup_mode() {
-        return $this->get_meta( '_wpinv_mode' );
+        return $this->get_meta('_wpinv_mode');
     }
 
     private function setup_gateway() {
-        $gateway = $this->get_meta( '_wpinv_gateway' );
+        $gateway = $this->get_meta('_wpinv_gateway');
         
-        if ( empty( $gateway ) && 'publish' === $this->status ) {
+        if (empty($gateway) && 'publish' === $this->status) {
             $gateway = 'manual';
         }
         
@@ -363,23 +363,23 @@ 
     }
     
     private function setup_gateway_title() {
-        $gateway_title = wpinv_get_gateway_checkout_label( $this->gateway );
+        $gateway_title = wpinv_get_gateway_checkout_label($this->gateway);
         return $gateway_title;
     }
 
     private function setup_transaction_id() {
-        $transaction_id = $this->get_meta( '_wpinv_transaction_id' );
+        $transaction_id = $this->get_meta('_wpinv_transaction_id');
 
-        if ( empty( $transaction_id ) || (int) $transaction_id === (int) $this->ID ) {
+        if (empty($transaction_id) || (int) $transaction_id === (int) $this->ID) {
             $gateway        = $this->gateway;
-            $transaction_id = apply_filters( 'wpinv_get_invoice_transaction_id-' . $gateway, $this->ID );
+            $transaction_id = apply_filters('wpinv_get_invoice_transaction_id-' . $gateway, $this->ID);
         }
 
         return $transaction_id;
     }
 
     private function setup_ip() {
-        $ip = $this->get_meta( '_wpinv_user_ip' );
+        $ip = $this->get_meta('_wpinv_user_ip');
         return $ip;
     }
 
@@ -389,62 +389,62 @@ 
     ///}
         
     private function setup_first_name() {
-        $first_name = $this->get_meta( '_wpinv_first_name' );
+        $first_name = $this->get_meta('_wpinv_first_name');
         return $first_name;
     }
     
     private function setup_last_name() {
-        $last_name = $this->get_meta( '_wpinv_last_name' );
+        $last_name = $this->get_meta('_wpinv_last_name');
         return $last_name;
     }
     
     private function setup_company() {
-        $company = $this->get_meta( '_wpinv_company' );
+        $company = $this->get_meta('_wpinv_company');
         return $company;
     }
     
     private function setup_vat_number() {
-        $vat_number = $this->get_meta( '_wpinv_vat_number' );
+        $vat_number = $this->get_meta('_wpinv_vat_number');
         return $vat_number;
     }
     
     private function setup_vat_rate() {
-        $vat_rate = $this->get_meta( '_wpinv_vat_rate' );
+        $vat_rate = $this->get_meta('_wpinv_vat_rate');
         return $vat_rate;
     }
     
     private function setup_adddress_confirmed() {
-        $adddress_confirmed = $this->get_meta( '_wpinv_adddress_confirmed' );
+        $adddress_confirmed = $this->get_meta('_wpinv_adddress_confirmed');
         return $adddress_confirmed;
     }
     
     private function setup_phone() {
-        $phone = $this->get_meta( '_wpinv_phone' );
+        $phone = $this->get_meta('_wpinv_phone');
         return $phone;
     }
     
     private function setup_address() {
-        $address = $this->get_meta( '_wpinv_address', true );
+        $address = $this->get_meta('_wpinv_address', true);
         return $address;
     }
     
     private function setup_city() {
-        $city = $this->get_meta( '_wpinv_city', true );
+        $city = $this->get_meta('_wpinv_city', true);
         return $city;
     }
     
     private function setup_country() {
-        $country = $this->get_meta( '_wpinv_country', true );
+        $country = $this->get_meta('_wpinv_country', true);
         return $country;
     }
     
     private function setup_state() {
-        $state = $this->get_meta( '_wpinv_state', true );
+        $state = $this->get_meta('_wpinv_state', true);
         return $state;
     }
     
     private function setup_zip() {
-        $zip = $this->get_meta( '_wpinv_zip', true );
+        $zip = $this->get_meta('_wpinv_zip', true);
         return $zip;
     }
 
@@ -453,7 +453,7 @@ 
             'user_id'        => $this->user_id,
             'first_name'     => $this->first_name,
             'last_name'      => $this->last_name,
-            'email'          => get_the_author_meta( 'email', $this->user_id ),
+            'email'          => get_the_author_meta('email', $this->user_id),
             'phone'          => $this->phone,
             'address'        => $this->address,
             'city'           => $this->city,
@@ -468,12 +468,12 @@ 
         );
         
         $user_info = array();
-        if ( isset( $this->payment_meta['user_info'] ) ) {
-            $user_info = maybe_unserialize( $this->payment_meta['user_info'] );
+        if (isset($this->payment_meta['user_info'])) {
+            $user_info = maybe_unserialize($this->payment_meta['user_info']);
             
-            if ( !empty( $user_info ) && isset( $user_info['user_id'] ) && $post = get_post( $this->ID ) ) {
+            if (!empty($user_info) && isset($user_info['user_id']) && $post = get_post($this->ID)) {
                 $this->user_id = $post->post_author;
-                $this->email = get_the_author_meta( 'email', $this->user_id );
+                $this->email = get_the_author_meta('email', $this->user_id);
                 
                 $user_info['user_id'] = $this->user_id;
                 $user_info['email'] = $this->email;
@@ -482,13 +482,13 @@ 
             }
         }
         
-        $user_info    = wp_parse_args( $user_info, $defaults );
+        $user_info = wp_parse_args($user_info, $defaults);
         
         // Get the user, but only if it's been created
-        $user = get_userdata( $this->user_id );
+        $user = get_userdata($this->user_id);
         
-        if ( !empty( $user ) && $user->ID > 0 ) {
-            if ( empty( $user_info ) ) {
+        if (!empty($user) && $user->ID > 0) {
+            if (empty($user_info)) {
                 $user_info = array(
                     'user_id'    => $user->ID,
                     'first_name' => $user->first_name,
@@ -497,23 +497,23 @@ 
                     'discount'   => '',
                 );
             } else {
-                foreach ( $user_info as $key => $value ) {
-                    if ( ! empty( $value ) ) {
+                foreach ($user_info as $key => $value) {
+                    if (!empty($value)) {
                         continue;
                     }
 
-                    switch( $key ) {
+                    switch ($key) {
                         case 'user_id':
-                            $user_info[ $key ] = $user->ID;
+                            $user_info[$key] = $user->ID;
                             break;
                         case 'first_name':
-                            $user_info[ $key ] = $user->first_name;
+                            $user_info[$key] = $user->first_name;
                             break;
                         case 'last_name':
-                            $user_info[ $key ] = $user->last_name;
+                            $user_info[$key] = $user->last_name;
                             break;
                         case 'email':
-                            $user_info[ $key ] = $user->user_email;
+                            $user_info[$key] = $user->user_email;
                             break;
                     }
                 }
@@ -524,25 +524,25 @@ 
     }
 
     private function setup_invoice_key() {
-        $key = $this->get_meta( '_wpinv_key', true );
+        $key = $this->get_meta('_wpinv_key', true);
         
         return $key;
     }
 
     private function setup_invoice_number() {
-        $number = $this->get_meta( '_wpinv_number', true );
+        $number = $this->get_meta('_wpinv_number', true);
 
-        if ( !$number ) {
+        if (!$number) {
             $number = $this->ID;
 
-            if ( $this->status == 'auto-draft' ) {
-                if ( wpinv_sequential_number_active( $this->post_type ) ) {
-                    $next_number = wpinv_get_next_invoice_number( $this->post_type );
+            if ($this->status == 'auto-draft') {
+                if (wpinv_sequential_number_active($this->post_type)) {
+                    $next_number = wpinv_get_next_invoice_number($this->post_type);
                     $number      = $next_number;
                 }
             }
             
-            $number = wpinv_format_invoice_number( $number, $this->post_type );
+            $number = wpinv_format_invoice_number($number, $this->post_type);
         }
 
         return $number;
@@ -551,10 +551,10 @@ 
     private function insert_invoice() {
         global $wpdb;
 
-        if ( empty( $this->post_type ) ) {
-            if ( !empty( $this->ID ) && $post_type = get_post_type( $this->ID ) ) {
+        if (empty($this->post_type)) {
+            if (!empty($this->ID) && $post_type = get_post_type($this->ID)) {
                 $this->post_type = $post_type;
-            } else if ( !empty( $this->parent_invoice ) && $post_type = get_post_type( $this->parent_invoice ) ) {
+            } else if (!empty($this->parent_invoice) && $post_type = get_post_type($this->parent_invoice)) {
                 $this->post_type = $post_type;
             } else {
                 $this->post_type = 'wpi_invoice';
@@ -562,16 +562,16 @@ 
         }
 
         $invoice_number = $this->ID;
-        if ( $number = $this->get_meta( '_wpinv_number', true ) ) {
+        if ($number = $this->get_meta('_wpinv_number', true)) {
             $invoice_number = $number;
         }
 
-        if ( empty( $this->key ) ) {
+        if (empty($this->key)) {
             $this->key = self::generate_key();
             $this->pending['key'] = $this->key;
         }
 
-        if ( empty( $this->ip ) ) {
+        if (empty($this->ip)) {
             $this->ip = wpinv_get_ip();
             $this->pending['ip'] = $this->ip;
         }
@@ -608,61 +608,61 @@ 
                         'post_status'   => $this->status,
                         'post_author'   => $this->user_id,
                         'post_type'     => $this->post_type,
-                        'post_date'     => ! empty( $this->date ) && $this->date != '0000-00-00 00:00:00' ? $this->date : current_time( 'mysql' ),
-                        'post_date_gmt' => ! empty( $this->date ) && $this->date != '0000-00-00 00:00:00' ? get_gmt_from_date( $this->date ) : current_time( 'mysql', 1 ),
+                        'post_date'     => !empty($this->date) && $this->date != '0000-00-00 00:00:00' ? $this->date : current_time('mysql'),
+                        'post_date_gmt' => !empty($this->date) && $this->date != '0000-00-00 00:00:00' ? get_gmt_from_date($this->date) : current_time('mysql', 1),
                         'post_parent'   => $this->parent_invoice,
                     );
-        $args = apply_filters( 'wpinv_insert_invoice_args', $post_data, $this );
+        $args = apply_filters('wpinv_insert_invoice_args', $post_data, $this);
 
         // Create a blank invoice
-        if ( !empty( $this->ID ) ) {
-            $args['ID']         = $this->ID;
+        if (!empty($this->ID)) {
+            $args['ID'] = $this->ID;
 
-            $invoice_id = wp_update_post( $args, true );
+            $invoice_id = wp_update_post($args, true);
         } else {
-            $invoice_id = wp_insert_post( $args, true );
+            $invoice_id = wp_insert_post($args, true);
         }
 
-        if ( is_wp_error( $invoice_id ) ) {
+        if (is_wp_error($invoice_id)) {
             return false;
         }
 
-        if ( !empty( $invoice_id ) ) {
+        if (!empty($invoice_id)) {
             $this->ID  = $invoice_id;
             $this->_ID = $invoice_id;
 
-            $this->payment_meta = apply_filters( 'wpinv_payment_meta', $this->payment_meta, $payment_data );
-            if ( ! empty( $this->payment_meta['fees'] ) ) {
-                $this->fees = array_merge( $this->fees, $this->payment_meta['fees'] );
-                foreach( $this->fees as $fee ) {
-                    $this->increase_fees( $fee['amount'] );
+            $this->payment_meta = apply_filters('wpinv_payment_meta', $this->payment_meta, $payment_data);
+            if (!empty($this->payment_meta['fees'])) {
+                $this->fees = array_merge($this->fees, $this->payment_meta['fees']);
+                foreach ($this->fees as $fee) {
+                    $this->increase_fees($fee['amount']);
                 }
             }
 
-            $this->update_meta( '_wpinv_payment_meta', $this->payment_meta );            
+            $this->update_meta('_wpinv_payment_meta', $this->payment_meta);            
             $this->new = true;
         }
 
         return $this->ID;
     }
 
-    public function save( $setup = false ) {
+    public function save($setup = false) {
         global $wpi_session;
         
         $saved = false;
-        if ( empty( $this->items ) ) {
+        if (empty($this->items)) {
             return $saved; // Don't save empty invoice.
         }
         
-        if ( empty( $this->key ) ) {
+        if (empty($this->key)) {
             $this->key = self::generate_key();
             $this->pending['key'] = $this->key;
         }
         
-        if ( empty( $this->ID ) ) {
+        if (empty($this->ID)) {
             $invoice_id = $this->insert_invoice();
 
-            if ( false === $invoice_id ) {
+            if (false === $invoice_id) {
                 $saved = false;
             } else {
                 $this->ID = $invoice_id;
@@ -670,27 +670,27 @@ 
         }
 
         // If we have something pending, let's save it
-        if ( !empty( $this->pending ) ) {
+        if (!empty($this->pending)) {
             $total_increase = 0;
             $total_decrease = 0;
 
-            foreach ( $this->pending as $key => $value ) {
-                switch( $key ) {
+            foreach ($this->pending as $key => $value) {
+                switch ($key) {
                     case 'items':
                         // Update totals for pending items
-                        foreach ( $this->pending[ $key ] as $item ) {
-                            switch( $item['action'] ) {
+                        foreach ($this->pending[$key] as $item) {
+                            switch ($item['action']) {
                                 case 'add':
                                     $price = $item['price'];
                                     $taxes = $item['tax'];
 
-                                    if ( 'publish' === $this->status ) {
+                                    if ('publish' === $this->status) {
                                         $total_increase += $price;
                                     }
                                     break;
 
                                 case 'remove':
-                                    if ( 'publish' === $this->status ) {
+                                    if ('publish' === $this->status) {
                                         $total_decrease += $item['price'];
                                     }
                                     break;
@@ -698,16 +698,16 @@ 
                         }
                         break;
                     case 'fees':
-                        if ( 'publish' !== $this->status ) {
+                        if ('publish' !== $this->status) {
                             break;
                         }
 
-                        if ( empty( $this->pending[ $key ] ) ) {
+                        if (empty($this->pending[$key])) {
                             break;
                         }
 
-                        foreach ( $this->pending[ $key ] as $fee ) {
-                            switch( $fee['action'] ) {
+                        foreach ($this->pending[$key] as $fee) {
+                            switch ($fee['action']) {
                                 case 'add':
                                     $total_increase += $fee['amount'];
                                     break;
@@ -719,83 +719,83 @@ 
                         }
                         break;
                     case 'status':
-                        $this->update_status( $this->status );
+                        $this->update_status($this->status);
                         break;
                     case 'gateway':
-                        $this->update_meta( '_wpinv_gateway', $this->gateway );
+                        $this->update_meta('_wpinv_gateway', $this->gateway);
                         break;
                     case 'mode':
-                        $this->update_meta( '_wpinv_mode', $this->mode );
+                        $this->update_meta('_wpinv_mode', $this->mode);
                         break;
                     case 'transaction_id':
-                        $this->update_meta( '_wpinv_transaction_id', $this->transaction_id );
+                        $this->update_meta('_wpinv_transaction_id', $this->transaction_id);
                         break;
                     case 'ip':
-                        $this->update_meta( '_wpinv_user_ip', $this->ip );
+                        $this->update_meta('_wpinv_user_ip', $this->ip);
                         break;
                     ///case 'user_id':
                         ///$this->update_meta( '_wpinv_user_id', $this->user_id );
                         ///$this->user_info['user_id'] = $this->user_id;
                         ///break;
                     case 'first_name':
-                        $this->update_meta( '_wpinv_first_name', $this->first_name );
+                        $this->update_meta('_wpinv_first_name', $this->first_name);
                         $this->user_info['first_name'] = $this->first_name;
                         break;
                     case 'last_name':
-                        $this->update_meta( '_wpinv_last_name', $this->last_name );
+                        $this->update_meta('_wpinv_last_name', $this->last_name);
                         $this->user_info['last_name'] = $this->last_name;
                         break;
                     case 'phone':
-                        $this->update_meta( '_wpinv_phone', $this->phone );
+                        $this->update_meta('_wpinv_phone', $this->phone);
                         $this->user_info['phone'] = $this->phone;
                         break;
                     case 'address':
-                        $this->update_meta( '_wpinv_address', $this->address );
+                        $this->update_meta('_wpinv_address', $this->address);
                         $this->user_info['address'] = $this->address;
                         break;
                     case 'city':
-                        $this->update_meta( '_wpinv_city', $this->city );
+                        $this->update_meta('_wpinv_city', $this->city);
                         $this->user_info['city'] = $this->city;
                         break;
                     case 'country':
-                        $this->update_meta( '_wpinv_country', $this->country );
+                        $this->update_meta('_wpinv_country', $this->country);
                         $this->user_info['country'] = $this->country;
                         break;
                     case 'state':
-                        $this->update_meta( '_wpinv_state', $this->state );
+                        $this->update_meta('_wpinv_state', $this->state);
                         $this->user_info['state'] = $this->state;
                         break;
                     case 'zip':
-                        $this->update_meta( '_wpinv_zip', $this->zip );
+                        $this->update_meta('_wpinv_zip', $this->zip);
                         $this->user_info['zip'] = $this->zip;
                         break;
                     case 'company':
-                        $this->update_meta( '_wpinv_company', $this->company );
+                        $this->update_meta('_wpinv_company', $this->company);
                         $this->user_info['company'] = $this->company;
                         break;
                     case 'vat_number':
-                        $this->update_meta( '_wpinv_vat_number', $this->vat_number );
+                        $this->update_meta('_wpinv_vat_number', $this->vat_number);
                         $this->user_info['vat_number'] = $this->vat_number;
                         
-                        $vat_info = $wpi_session->get( 'user_vat_data' );
-                        if ( $this->vat_number && !empty( $vat_info ) && isset( $vat_info['number'] ) && isset( $vat_info['valid'] ) && $vat_info['number'] == $this->vat_number ) {
-                            $adddress_confirmed = isset( $vat_info['adddress_confirmed'] ) ? $vat_info['adddress_confirmed'] : false;
-                            $this->update_meta( '_wpinv_adddress_confirmed', (bool)$adddress_confirmed );
-                            $this->user_info['adddress_confirmed'] = (bool)$adddress_confirmed;
+                        $vat_info = $wpi_session->get('user_vat_data');
+                        if ($this->vat_number && !empty($vat_info) && isset($vat_info['number']) && isset($vat_info['valid']) && $vat_info['number'] == $this->vat_number) {
+                            $adddress_confirmed = isset($vat_info['adddress_confirmed']) ? $vat_info['adddress_confirmed'] : false;
+                            $this->update_meta('_wpinv_adddress_confirmed', (bool) $adddress_confirmed);
+                            $this->user_info['adddress_confirmed'] = (bool) $adddress_confirmed;
                         }
     
                         break;
                     case 'vat_rate':
-                        $this->update_meta( '_wpinv_vat_rate', $this->vat_rate );
+                        $this->update_meta('_wpinv_vat_rate', $this->vat_rate);
                         $this->user_info['vat_rate'] = $this->vat_rate;
                         break;
                     case 'adddress_confirmed':
-                        $this->update_meta( '_wpinv_adddress_confirmed', $this->adddress_confirmed );
+                        $this->update_meta('_wpinv_adddress_confirmed', $this->adddress_confirmed);
                         $this->user_info['adddress_confirmed'] = $this->adddress_confirmed;
                         break;
                     
                     case 'key':
-                        $this->update_meta( '_wpinv_key', $this->key );
+                        $this->update_meta('_wpinv_key', $this->key);
                         break;
                     case 'date':
                         $args = array(
@@ -804,49 +804,49 @@ 
                             'edit_date' => true,
                         );
 
-                        wp_update_post( $args );
+                        wp_update_post($args);
                         break;
                     case 'due_date':
-                        if ( empty( $this->due_date ) ) {
+                        if (empty($this->due_date)) {
                             $this->due_date = 'none';
                         }
                         
-                        $this->update_meta( '_wpinv_due_date', $this->due_date );
+                        $this->update_meta('_wpinv_due_date', $this->due_date);
                         break;
                     case 'completed_date':
-                        $this->update_meta( '_wpinv_completed_date', $this->completed_date );
+                        $this->update_meta('_wpinv_completed_date', $this->completed_date);
                         break;
                     case 'discounts':
-                        if ( ! is_array( $this->discounts ) ) {
-                            $this->discounts = explode( ',', $this->discounts );
+                        if (!is_array($this->discounts)) {
+                            $this->discounts = explode(',', $this->discounts);
                         }
 
-                        $this->user_info['discount'] = implode( ',', $this->discounts );
+                        $this->user_info['discount'] = implode(',', $this->discounts);
                         break;
                     case 'discount':
-                        $this->update_meta( '_wpinv_discount', wpinv_round_amount( $this->discount ) );
+                        $this->update_meta('_wpinv_discount', wpinv_round_amount($this->discount));
                         break;
                     case 'discount_code':
-                        $this->update_meta( '_wpinv_discount_code', $this->discount_code );
+                        $this->update_meta('_wpinv_discount_code', $this->discount_code);
                         break;
                     case 'parent_invoice':
                         $args = array(
                             'ID'          => $this->ID,
                             'post_parent' => $this->parent_invoice,
                         );
-                        wp_update_post( $args );
+                        wp_update_post($args);
                         break;
                     default:
-                        do_action( 'wpinv_save', $this, $key );
+                        do_action('wpinv_save', $this, $key);
                         break;
                 }
             }
 
-            $this->update_meta( '_wpinv_subtotal', wpinv_round_amount( $this->subtotal ) );
-            $this->update_meta( '_wpinv_total', wpinv_round_amount( $this->total ) );
-            $this->update_meta( '_wpinv_tax', wpinv_round_amount( $this->tax ) );
+            $this->update_meta('_wpinv_subtotal', wpinv_round_amount($this->subtotal));
+            $this->update_meta('_wpinv_total', wpinv_round_amount($this->total));
+            $this->update_meta('_wpinv_tax', wpinv_round_amount($this->tax));
             
-            $this->items    = array_values( $this->items );
+            $this->items = array_values($this->items);
             
             $new_meta = array(
                 'items'         => $this->items,
@@ -857,12 +857,12 @@ 
             );
             
             $meta        = $this->get_meta();
-            $merged_meta = array_merge( $meta, $new_meta );
+            $merged_meta = array_merge($meta, $new_meta);
 
             // Only save the payment meta if it's changed
-            if ( md5( serialize( $meta ) ) !== md5( serialize( $merged_meta) ) ) {
-                $updated     = $this->update_meta( '_wpinv_payment_meta', $merged_meta );
-                if ( false !== $updated ) {
+            if (md5(serialize($meta)) !== md5(serialize($merged_meta))) {
+                $updated = $this->update_meta('_wpinv_payment_meta', $merged_meta);
+                if (false !== $updated) {
                     $saved = true;
                 }
             }
@@ -870,15 +870,15 @@ 
             $this->pending = array();
             $saved         = true;
         } else {
-            $this->update_meta( '_wpinv_subtotal', wpinv_round_amount( $this->subtotal ) );
-            $this->update_meta( '_wpinv_total', wpinv_round_amount( $this->total ) );
-            $this->update_meta( '_wpinv_tax', wpinv_round_amount( $this->tax ) );
+            $this->update_meta('_wpinv_subtotal', wpinv_round_amount($this->subtotal));
+            $this->update_meta('_wpinv_total', wpinv_round_amount($this->total));
+            $this->update_meta('_wpinv_tax', wpinv_round_amount($this->tax));
         }
         
-        do_action( 'wpinv_invoice_save', $this, $saved );
+        do_action('wpinv_invoice_save', $this, $saved);
 
-        if ( true === $saved || $setup ) {
-            $this->setup_invoice( $this->ID );
+        if (true === $saved || $setup) {
+            $this->setup_invoice($this->ID);
         }
         
         $this->refresh_item_ids();
@@ -886,7 +886,7 @@ 
         return $saved;
     }
     
-    public function add_fee( $args, $global = true ) {
+    public function add_fee($args, $global = true) {
         $default_args = array(
             'label'       => '',
             'amount'      => 0,
@@ -896,75 +896,75 @@ 
             'item_id'     => 0,
         );
 
-        $fee = wp_parse_args( $args, $default_args );
+        $fee = wp_parse_args($args, $default_args);
         
-        if ( empty( $fee['label'] ) ) {
+        if (empty($fee['label'])) {
             return false;
         }
         
-        $fee['id']  = sanitize_title( $fee['label'] );
+        $fee['id'] = sanitize_title($fee['label']);
         
-        $this->fees[]               = $fee;
+        $this->fees[] = $fee;
         
         $added_fee               = $fee;
         $added_fee['action']     = 'add';
         $this->pending['fees'][] = $added_fee;
-        reset( $this->fees );
+        reset($this->fees);
 
-        $this->increase_fees( $fee['amount'] );
+        $this->increase_fees($fee['amount']);
         return true;
     }
 
-    public function remove_fee( $key ) {
+    public function remove_fee($key) {
         $removed = false;
 
-        if ( is_numeric( $key ) ) {
-            $removed = $this->remove_fee_by( 'index', $key );
+        if (is_numeric($key)) {
+            $removed = $this->remove_fee_by('index', $key);
         }
 
         return $removed;
     }
 
-    public function remove_fee_by( $key, $value, $global = false ) {
-        $allowed_fee_keys = apply_filters( 'wpinv_fee_keys', array(
+    public function remove_fee_by($key, $value, $global = false) {
+        $allowed_fee_keys = apply_filters('wpinv_fee_keys', array(
             'index', 'label', 'amount', 'type',
-        ) );
+        ));
 
-        if ( ! in_array( $key, $allowed_fee_keys ) ) {
+        if (!in_array($key, $allowed_fee_keys)) {
             return false;
         }
 
         $removed = false;
-        if ( 'index' === $key && array_key_exists( $value, $this->fees ) ) {
-            $removed_fee             = $this->fees[ $value ];
+        if ('index' === $key && array_key_exists($value, $this->fees)) {
+            $removed_fee             = $this->fees[$value];
             $removed_fee['action']   = 'remove';
             $this->pending['fees'][] = $removed_fee;
 
-            $this->decrease_fees( $removed_fee['amount'] );
+            $this->decrease_fees($removed_fee['amount']);
 
-            unset( $this->fees[ $value ] );
+            unset($this->fees[$value]);
             $removed = true;
-        } else if ( 'index' !== $key ) {
-            foreach ( $this->fees as $index => $fee ) {
-                if ( isset( $fee[ $key ] ) && $fee[ $key ] == $value ) {
+        } else if ('index' !== $key) {
+            foreach ($this->fees as $index => $fee) {
+                if (isset($fee[$key]) && $fee[$key] == $value) {
                     $removed_fee             = $fee;
                     $removed_fee['action']   = 'remove';
                     $this->pending['fees'][] = $removed_fee;
 
-                    $this->decrease_fees( $removed_fee['amount'] );
+                    $this->decrease_fees($removed_fee['amount']);
 
-                    unset( $this->fees[ $index ] );
+                    unset($this->fees[$index]);
                     $removed = true;
 
-                    if ( false === $global ) {
+                    if (false === $global) {
                         break;
                     }
                 }
             }
         }
 
-        if ( true === $removed ) {
-            $this->fees = array_values( $this->fees );
+        if (true === $removed) {
+            $this->fees = array_values($this->fees);
         }
 
         return $removed;
@@ -972,35 +972,35 @@ 
 
     
 
-    public function add_note( $note = '', $customer_type = false, $added_by_user = false, $system = false ) {
+    public function add_note($note = '', $customer_type = false, $added_by_user = false, $system = false) {
         // Bail if no note specified
-        if( !$note ) {
+        if (!$note) {
             return false;
         }
 
-        if ( empty( $this->ID ) )
+        if (empty($this->ID))
             return false;
         
-        if ( ( ( is_user_logged_in() && wpinv_current_user_can_manage_invoicing() ) || $added_by_user ) && !$system ) {
-            $user                 = get_user_by( 'id', get_current_user_id() );
+        if (((is_user_logged_in() && wpinv_current_user_can_manage_invoicing()) || $added_by_user) && !$system) {
+            $user                 = get_user_by('id', get_current_user_id());
             $comment_author       = $user->display_name;
             $comment_author_email = $user->user_email;
         } else {
             $comment_author       = 'System';
             $comment_author_email = 'system@';
-            $comment_author_email .= isset( $_SERVER['HTTP_HOST'] ) ? str_replace( 'www.', '', $_SERVER['HTTP_HOST'] ) : 'noreply.com';
-            $comment_author_email = sanitize_email( $comment_author_email );
+            $comment_author_email .= isset($_SERVER['HTTP_HOST']) ? str_replace('www.', '', $_SERVER['HTTP_HOST']) : 'noreply.com';
+            $comment_author_email = sanitize_email($comment_author_email);
         }
 
-        do_action( 'wpinv_pre_insert_invoice_note', $this->ID, $note, $customer_type );
+        do_action('wpinv_pre_insert_invoice_note', $this->ID, $note, $customer_type);
 
-        $note_id = wp_insert_comment( wp_filter_comment( array(
+        $note_id = wp_insert_comment(wp_filter_comment(array(
             'comment_post_ID'      => $this->ID,
             'comment_content'      => $note,
             'comment_agent'        => 'WPInvoicing',
             'user_id'              => is_admin() ? get_current_user_id() : 0,
-            'comment_date'         => current_time( 'mysql' ),
-            'comment_date_gmt'     => current_time( 'mysql', 1 ),
+            'comment_date'         => current_time('mysql'),
+            'comment_date_gmt'     => current_time('mysql', 1),
             'comment_approved'     => 1,
             'comment_parent'       => 0,
             'comment_author'       => $comment_author,
@@ -1008,53 +1008,53 @@ 
             'comment_author_url'   => '',
             'comment_author_email' => $comment_author_email,
             'comment_type'         => 'wpinv_note'
-        ) ) );
+        )));
 
-        do_action( 'wpinv_insert_payment_note', $note_id, $this->ID, $note );
+        do_action('wpinv_insert_payment_note', $note_id, $this->ID, $note);
         
-        if ( $customer_type ) {
-            add_comment_meta( $note_id, '_wpi_customer_note', 1 );
+        if ($customer_type) {
+            add_comment_meta($note_id, '_wpi_customer_note', 1);
 
-            do_action( 'wpinv_new_customer_note', array( 'invoice_id' => $this->ID, 'user_note' => $note ) );
+            do_action('wpinv_new_customer_note', array('invoice_id' => $this->ID, 'user_note' => $note));
         }
 
         return $note_id;
     }
 
-    private function increase_subtotal( $amount = 0.00 ) {
+    private function increase_subtotal($amount = 0.00) {
         $amount          = (float) $amount;
         $this->subtotal += $amount;
-        $this->subtotal  = wpinv_round_amount( $this->subtotal );
+        $this->subtotal  = wpinv_round_amount($this->subtotal);
 
         $this->recalculate_total();
     }
 
-    private function decrease_subtotal( $amount = 0.00 ) {
+    private function decrease_subtotal($amount = 0.00) {
         $amount          = (float) $amount;
         $this->subtotal -= $amount;
-        $this->subtotal  = wpinv_round_amount( $this->subtotal );
+        $this->subtotal  = wpinv_round_amount($this->subtotal);
 
-        if ( $this->subtotal < 0 ) {
+        if ($this->subtotal < 0) {
             $this->subtotal = 0;
         }
 
         $this->recalculate_total();
     }
 
-    private function increase_fees( $amount = 0.00 ) {
-        $amount            = (float)$amount;
+    private function increase_fees($amount = 0.00) {
+        $amount            = (float) $amount;
         $this->fees_total += $amount;
-        $this->fees_total  = wpinv_round_amount( $this->fees_total );
+        $this->fees_total  = wpinv_round_amount($this->fees_total);
 
         $this->recalculate_total();
     }
 
-    private function decrease_fees( $amount = 0.00 ) {
+    private function decrease_fees($amount = 0.00) {
         $amount            = (float) $amount;
         $this->fees_total -= $amount;
-        $this->fees_total  = wpinv_round_amount( $this->fees_total );
+        $this->fees_total  = wpinv_round_amount($this->fees_total);
 
-        if ( $this->fees_total < 0 ) {
+        if ($this->fees_total < 0) {
             $this->fees_total = 0;
         }
 
@@ -1065,54 +1065,54 @@ 
         global $wpi_nosave;
         
         $this->total = $this->subtotal + $this->tax + $this->fees_total;
-        $this->total = wpinv_round_amount( $this->total );
+        $this->total = wpinv_round_amount($this->total);
         
-        do_action( 'wpinv_invoice_recalculate_total', $this, $wpi_nosave );
+        do_action('wpinv_invoice_recalculate_total', $this, $wpi_nosave);
     }
     
-    public function increase_tax( $amount = 0.00 ) {
+    public function increase_tax($amount = 0.00) {
         $amount       = (float) $amount;
         $this->tax   += $amount;
 
         $this->recalculate_total();
     }
 
-    public function decrease_tax( $amount = 0.00 ) {
+    public function decrease_tax($amount = 0.00) {
         $amount     = (float) $amount;
         $this->tax -= $amount;
 
-        if ( $this->tax < 0 ) {
+        if ($this->tax < 0) {
             $this->tax = 0;
         }
 
         $this->recalculate_total();
     }
 
-    public function update_status( $new_status = false, $note = '', $manual = false ) {
-        $old_status = ! empty( $this->old_status ) ? $this->old_status : get_post_status( $this->ID );
+    public function update_status($new_status = false, $note = '', $manual = false) {
+        $old_status = !empty($this->old_status) ? $this->old_status : get_post_status($this->ID);
 
-        if ( $old_status === $new_status && in_array( $new_status, array_keys( wpinv_get_invoice_statuses( true ) ) ) ) {
+        if ($old_status === $new_status && in_array($new_status, array_keys(wpinv_get_invoice_statuses(true)))) {
             return false; // Don't permit status changes that aren't changes
         }
 
-        $do_change = apply_filters( 'wpinv_should_update_invoice_status', true, $this->ID, $new_status, $old_status );
+        $do_change = apply_filters('wpinv_should_update_invoice_status', true, $this->ID, $new_status, $old_status);
         $updated = false;
 
-        if ( $do_change ) {
-            do_action( 'wpinv_before_invoice_status_change', $this->ID, $new_status, $old_status );
+        if ($do_change) {
+            do_action('wpinv_before_invoice_status_change', $this->ID, $new_status, $old_status);
 
             $update_post_data                   = array();
             $update_post_data['ID']             = $this->ID;
             $update_post_data['post_status']    = $new_status;
-            $update_post_data['edit_date']      = current_time( 'mysql', 0 );
-            $update_post_data['edit_date_gmt']  = current_time( 'mysql', 1 );
+            $update_post_data['edit_date']      = current_time('mysql', 0);
+            $update_post_data['edit_date_gmt']  = current_time('mysql', 1);
             
-            $update_post_data = apply_filters( 'wpinv_update_invoice_status_fields', $update_post_data, $this->ID );
+            $update_post_data = apply_filters('wpinv_update_invoice_status_fields', $update_post_data, $this->ID);
 
-            $updated = wp_update_post( $update_post_data );     
+            $updated = wp_update_post($update_post_data);     
            
             // Process any specific status functions
-            switch( $new_status ) {
+            switch ($new_status) {
                 case 'wpi-refunded':
                     $this->process_refund();
                     break;
@@ -1125,9 +1125,9 @@ 
             }
             
             // Status was changed.
-            do_action( 'wpinv_status_' . $new_status, $this->ID, $old_status );
-            do_action( 'wpinv_status_' . $old_status . '_to_' . $new_status, $this->ID, $old_status );
-            do_action( 'wpinv_update_status', $this->ID, $new_status, $old_status );
+            do_action('wpinv_status_' . $new_status, $this->ID, $old_status);
+            do_action('wpinv_status_' . $old_status . '_to_' . $new_status, $this->ID, $old_status);
+            do_action('wpinv_update_status', $this->ID, $new_status, $old_status);
         }
 
         return $updated;
@@ -1141,20 +1141,20 @@ 
         $this->save();
     }
 
-    public function update_meta( $meta_key = '', $meta_value = '', $prev_value = '' ) {
-        if ( empty( $meta_key ) ) {
+    public function update_meta($meta_key = '', $meta_value = '', $prev_value = '') {
+        if (empty($meta_key)) {
             return false;
         }
 
-        if ( $meta_key == 'key' || $meta_key == 'date' ) {
+        if ($meta_key == 'key' || $meta_key == 'date') {
             $current_meta = $this->get_meta();
-            $current_meta[ $meta_key ] = $meta_value;
+            $current_meta[$meta_key] = $meta_value;
 
             $meta_key     = '_wpinv_payment_meta';
             $meta_value   = $current_meta;
         }
 
-        $meta_value = apply_filters( 'wpinv_update_payment_meta_' . $meta_key, $meta_value, $this->ID );
+        $meta_value = apply_filters('wpinv_update_payment_meta_' . $meta_key, $meta_value, $this->ID);
         
         // Do not update created date on invoice marked as paid.
         /*if ( $meta_key == '_wpinv_completed_date' && !empty( $meta_value ) ) {
@@ -1169,45 +1169,45 @@ 
             wp_update_post( $args );
         }*/
         
-        return update_post_meta( $this->ID, $meta_key, $meta_value, $prev_value );
+        return update_post_meta($this->ID, $meta_key, $meta_value, $prev_value);
     }
 
     private function process_refund() {
         $process_refund = true;
 
         // If the payment was not in publish, don't decrement stats as they were never incremented
-        if ( 'publish' != $this->old_status || 'wpi-refunded' != $this->status ) {
+        if ('publish' != $this->old_status || 'wpi-refunded' != $this->status) {
             $process_refund = false;
         }
 
         // Allow extensions to filter for their own payment types, Example: Recurring Payments
-        $process_refund = apply_filters( 'wpinv_should_process_refund', $process_refund, $this );
+        $process_refund = apply_filters('wpinv_should_process_refund', $process_refund, $this);
 
-        if ( false === $process_refund ) {
+        if (false === $process_refund) {
             return;
         }
 
-        do_action( 'wpinv_pre_refund_invoice', $this );
+        do_action('wpinv_pre_refund_invoice', $this);
         
-        $decrease_store_earnings = apply_filters( 'wpinv_decrease_store_earnings_on_refund', true, $this );
-        $decrease_customer_value = apply_filters( 'wpinv_decrease_customer_value_on_refund', true, $this );
-        $decrease_purchase_count = apply_filters( 'wpinv_decrease_customer_purchase_count_on_refund', true, $this );
+        $decrease_store_earnings = apply_filters('wpinv_decrease_store_earnings_on_refund', true, $this);
+        $decrease_customer_value = apply_filters('wpinv_decrease_customer_value_on_refund', true, $this);
+        $decrease_purchase_count = apply_filters('wpinv_decrease_customer_purchase_count_on_refund', true, $this);
         
-        do_action( 'wpinv_post_refund_invoice', $this );
+        do_action('wpinv_post_refund_invoice', $this);
     }
 
     private function process_failure() {
         $discounts = $this->discounts;
-        if ( empty( $discounts ) ) {
+        if (empty($discounts)) {
             return;
         }
 
-        if ( ! is_array( $discounts ) ) {
-            $discounts = array_map( 'trim', explode( ',', $discounts ) );
+        if (!is_array($discounts)) {
+            $discounts = array_map('trim', explode(',', $discounts));
         }
 
-        foreach ( $discounts as $discount ) {
-            wpinv_decrease_discount_usage( $discount );
+        foreach ($discounts as $discount) {
+            wpinv_decrease_discount_usage($discount);
         }
     }
     
@@ -1215,92 +1215,92 @@ 
         $process_pending = true;
 
         // If the payment was not in publish or revoked status, don't decrement stats as they were never incremented
-        if ( ( 'publish' != $this->old_status && 'revoked' != $this->old_status ) || 'wpi-pending' != $this->status ) {
+        if (('publish' != $this->old_status && 'revoked' != $this->old_status) || 'wpi-pending' != $this->status) {
             $process_pending = false;
         }
 
         // Allow extensions to filter for their own payment types, Example: Recurring Payments
-        $process_pending = apply_filters( 'wpinv_should_process_pending', $process_pending, $this );
+        $process_pending = apply_filters('wpinv_should_process_pending', $process_pending, $this);
 
-        if ( false === $process_pending ) {
+        if (false === $process_pending) {
             return;
         }
 
-        $decrease_store_earnings = apply_filters( 'wpinv_decrease_store_earnings_on_pending', true, $this );
-        $decrease_customer_value = apply_filters( 'wpinv_decrease_customer_value_on_pending', true, $this );
-        $decrease_purchase_count = apply_filters( 'wpinv_decrease_customer_purchase_count_on_pending', true, $this );
+        $decrease_store_earnings = apply_filters('wpinv_decrease_store_earnings_on_pending', true, $this);
+        $decrease_customer_value = apply_filters('wpinv_decrease_customer_value_on_pending', true, $this);
+        $decrease_purchase_count = apply_filters('wpinv_decrease_customer_purchase_count_on_pending', true, $this);
 
         $this->completed_date = '';
-        $this->update_meta( '_wpinv_completed_date', '' );
+        $this->update_meta('_wpinv_completed_date', '');
     }
     
     // get data
-    public function get_meta( $meta_key = '_wpinv_payment_meta', $single = true ) {
-        $meta = get_post_meta( $this->ID, $meta_key, $single );
+    public function get_meta($meta_key = '_wpinv_payment_meta', $single = true) {
+        $meta = get_post_meta($this->ID, $meta_key, $single);
 
-        if ( $meta_key === '_wpinv_payment_meta' ) {
+        if ($meta_key === '_wpinv_payment_meta') {
 
-            if(!is_array($meta)){$meta = array();} // we need this to be an array so make sure it is.
+            if (!is_array($meta)) {$meta = array(); } // we need this to be an array so make sure it is.
 
-            if ( empty( $meta['key'] ) ) {
+            if (empty($meta['key'])) {
                 $meta['key'] = $this->setup_invoice_key();
             }
 
-            if ( empty( $meta['date'] ) ) {
-                $meta['date'] = get_post_field( 'post_date', $this->ID );
+            if (empty($meta['date'])) {
+                $meta['date'] = get_post_field('post_date', $this->ID);
             }
         }
 
-        $meta = apply_filters( 'wpinv_get_invoice_meta_' . $meta_key, $meta, $this->ID );
+        $meta = apply_filters('wpinv_get_invoice_meta_' . $meta_key, $meta, $this->ID);
 
-        return apply_filters( 'wpinv_get_invoice_meta', $meta, $this->ID, $meta_key );
+        return apply_filters('wpinv_get_invoice_meta', $meta, $this->ID, $meta_key);
     }
     
     public function get_description() {
-        $post = get_post( $this->ID );
+        $post = get_post($this->ID);
         
-        $description = !empty( $post ) ? $post->post_content : '';
-        return apply_filters( 'wpinv_get_description', $description, $this->ID, $this );
+        $description = !empty($post) ? $post->post_content : '';
+        return apply_filters('wpinv_get_description', $description, $this->ID, $this);
     }
     
-    public function get_status( $nicename = false ) {
-        if ( !$nicename ) {
+    public function get_status($nicename = false) {
+        if (!$nicename) {
             $status = $this->status;
         } else {
             $status = $this->status_nicename;
         }
         
-        return apply_filters( 'wpinv_get_status', $status, $nicename, $this->ID, $this );
+        return apply_filters('wpinv_get_status', $status, $nicename, $this->ID, $this);
     }
     
     public function get_cart_details() {
-        return apply_filters( 'wpinv_cart_details', $this->cart_details, $this->ID, $this );
+        return apply_filters('wpinv_cart_details', $this->cart_details, $this->ID, $this);
     }
     
-    public function get_subtotal( $currency = false ) {
-        $subtotal = wpinv_round_amount( $this->subtotal );
+    public function get_subtotal($currency = false) {
+        $subtotal = wpinv_round_amount($this->subtotal);
         
-        if ( $currency ) {
-            $subtotal = wpinv_price( wpinv_format_amount( $subtotal, NULL, !$currency ), $this->get_currency() );
+        if ($currency) {
+            $subtotal = wpinv_price(wpinv_format_amount($subtotal, NULL, !$currency), $this->get_currency());
         }
         
-        return apply_filters( 'wpinv_get_invoice_subtotal', $subtotal, $this->ID, $this, $currency );
+        return apply_filters('wpinv_get_invoice_subtotal', $subtotal, $this->ID, $this, $currency);
     }
     
-    public function get_total( $currency = false ) {        
-        if ( $this->is_free_trial() ) {
-            $total = wpinv_round_amount( 0 );
+    public function get_total($currency = false) {        
+        if ($this->is_free_trial()) {
+            $total = wpinv_round_amount(0);
         } else {
-            $total = wpinv_round_amount( $this->total );
+            $total = wpinv_round_amount($this->total);
         }
-        if ( $currency ) {
-            $total = wpinv_price( wpinv_format_amount( $total, NULL, !$currency ), $this->get_currency() );
+        if ($currency) {
+            $total = wpinv_price(wpinv_format_amount($total, NULL, !$currency), $this->get_currency());
         }
         
-        return apply_filters( 'wpinv_get_invoice_total', $total, $this->ID, $this, $currency );
+        return apply_filters('wpinv_get_invoice_total', $total, $this->ID, $this, $currency);
     }
     
-    public function get_recurring_details( $field = '', $currency = false ) {        
+    public function get_recurring_details($field = '', $currency = false) {        
         $data                 = array();
         $data['cart_details'] = $this->cart_details;
         $data['subtotal']     = $this->get_subtotal();
@@ -1308,164 +1308,164 @@ 
         $data['tax']          = $this->get_tax();
         $data['total']        = $this->get_total();
     
-        if ( !empty( $this->cart_details ) && ( $this->is_parent() || $this->is_renewal() ) ) {
+        if (!empty($this->cart_details) && ($this->is_parent() || $this->is_renewal())) {
             $is_free_trial = $this->is_free_trial();
-            $discounts = $this->get_discounts( true );
+            $discounts = $this->get_discounts(true);
             
-            if ( $is_free_trial || !empty( $discounts ) ) {
+            if ($is_free_trial || !empty($discounts)) {
                 $first_use_only = false;
                 
-                if ( !empty( $discounts ) ) {
-                    foreach ( $discounts as $key => $code ) {
-                        if ( wpinv_discount_is_recurring( $code, true ) && !$this->is_renewal() ) {
+                if (!empty($discounts)) {
+                    foreach ($discounts as $key => $code) {
+                        if (wpinv_discount_is_recurring($code, true) && !$this->is_renewal()) {
                             $first_use_only = true;
                             break;
                         }
                     }
                 }
                     
-                if ( !$first_use_only ) {
-                    $data['subtotal'] = wpinv_round_amount( $this->subtotal );
-                    $data['discount'] = wpinv_round_amount( $this->discount );
-                    $data['tax']      = wpinv_round_amount( $this->tax );
-                    $data['total']    = wpinv_round_amount( $this->total );
+                if (!$first_use_only) {
+                    $data['subtotal'] = wpinv_round_amount($this->subtotal);
+                    $data['discount'] = wpinv_round_amount($this->discount);
+                    $data['tax']      = wpinv_round_amount($this->tax);
+                    $data['total']    = wpinv_round_amount($this->total);
                 } else {
                     $cart_subtotal   = 0;
                     $cart_discount   = $this->discount;
                     $cart_tax        = 0;
 
-                    foreach ( $this->cart_details as $key => $item ) {
-                        $item_quantity  = $item['quantity'] > 0 ? absint( $item['quantity'] ) : 1;
-                        $item_subtotal  = !empty( $item['subtotal'] ) ? $item['subtotal'] : $item['item_price'] * $item_quantity;
+                    foreach ($this->cart_details as $key => $item) {
+                        $item_quantity  = $item['quantity'] > 0 ? absint($item['quantity']) : 1;
+                        $item_subtotal  = !empty($item['subtotal']) ? $item['subtotal'] : $item['item_price'] * $item_quantity;
                         $item_discount  = 0;
-                        $item_tax       = $item_subtotal > 0 && !empty( $item['vat_rate'] ) ? ( $item_subtotal * 0.01 * (float)$item['vat_rate'] ) : 0;
+                        $item_tax       = $item_subtotal > 0 && !empty($item['vat_rate']) ? ($item_subtotal * 0.01 * (float) $item['vat_rate']) : 0;
                         
-                        if ( wpinv_prices_include_tax() ) {
-                            $item_subtotal -= wpinv_round_amount( $item_tax );
+                        if (wpinv_prices_include_tax()) {
+                            $item_subtotal -= wpinv_round_amount($item_tax);
                         }
                         
                         $item_total     = $item_subtotal - $item_discount + $item_tax;
                         // Do not allow totals to go negative
-                        if ( $item_total < 0 ) {
+                        if ($item_total < 0) {
                             $item_total = 0;
                         }
                         
-                        $cart_subtotal  += (float)($item_subtotal);
-                        $cart_discount  += (float)($item_discount);
-                        $cart_tax       += (float)($item_tax);
+                        $cart_subtotal  += (float) ($item_subtotal);
+                        $cart_discount  += (float) ($item_discount);
+                        $cart_tax       += (float) ($item_tax);
                         
-                        $data['cart_details'][$key]['discount']   = wpinv_round_amount( $item_discount );
-                        $data['cart_details'][$key]['tax']        = wpinv_round_amount( $item_tax );
-                        $data['cart_details'][$key]['price']      = wpinv_round_amount( $item_total );
+                        $data['cart_details'][$key]['discount']   = wpinv_round_amount($item_discount);
+                        $data['cart_details'][$key]['tax']        = wpinv_round_amount($item_tax);
+                        $data['cart_details'][$key]['price']      = wpinv_round_amount($item_total);
                     }
 
 	                $total = $data['subtotal'] - $data['discount'] + $data['tax'];
-	                if ( $total < 0 ) {
+	                if ($total < 0) {
 		                $total = 0;
 	                }
 
-                    $data['subtotal'] = wpinv_round_amount( $cart_subtotal );
-                    $data['discount'] = wpinv_round_amount( $cart_discount );
-                    $data['tax']      = wpinv_round_amount( $cart_tax );
-                    $data['total']    = wpinv_round_amount( $total );
+                    $data['subtotal'] = wpinv_round_amount($cart_subtotal);
+                    $data['discount'] = wpinv_round_amount($cart_discount);
+                    $data['tax']      = wpinv_round_amount($cart_tax);
+                    $data['total']    = wpinv_round_amount($total);
                 }
             }
         }
         
-        $data = apply_filters( 'wpinv_get_invoice_recurring_details', $data, $this, $field, $currency );
+        $data = apply_filters('wpinv_get_invoice_recurring_details', $data, $this, $field, $currency);
 
-        if ( isset( $data[$field] ) ) {
-            return ( $currency ? wpinv_price( $data[$field], $this->get_currency() ) : $data[$field] );
+        if (isset($data[$field])) {
+            return ($currency ? wpinv_price($data[$field], $this->get_currency()) : $data[$field]);
         }
         
         return $data;
     }
     
-    public function get_final_tax( $currency = false ) {        
-        $final_total = wpinv_round_amount( $this->tax );
-        if ( $currency ) {
-            $final_total = wpinv_price( wpinv_format_amount( $final_total, NULL, !$currency ), $this->get_currency() );
+    public function get_final_tax($currency = false) {        
+        $final_total = wpinv_round_amount($this->tax);
+        if ($currency) {
+            $final_total = wpinv_price(wpinv_format_amount($final_total, NULL, !$currency), $this->get_currency());
         }
         
-        return apply_filters( 'wpinv_get_invoice_final_total', $final_total, $this, $currency );
+        return apply_filters('wpinv_get_invoice_final_total', $final_total, $this, $currency);
     }
     
-    public function get_discounts( $array = false ) {
+    public function get_discounts($array = false) {
         $discounts = $this->discounts;
-        if ( $array && $discounts ) {
-            $discounts = explode( ',', $discounts );
+        if ($array && $discounts) {
+            $discounts = explode(',', $discounts);
         }
-        return apply_filters( 'wpinv_payment_discounts', $discounts, $this->ID, $this, $array );
+        return apply_filters('wpinv_payment_discounts', $discounts, $this->ID, $this, $array);
     }
     
-    public function get_discount( $currency = false, $dash = false ) {
-        if ( !empty( $this->discounts ) ) {
+    public function get_discount($currency = false, $dash = false) {
+        if (!empty($this->discounts)) {
             global $ajax_cart_details;
             $ajax_cart_details = $this->get_cart_details();
             
-            if ( !empty( $ajax_cart_details ) && count( $ajax_cart_details ) == count( $this->items ) ) {
+            if (!empty($ajax_cart_details) && count($ajax_cart_details) == count($this->items)) {
                 $cart_items = $ajax_cart_details;
             } else {
                 $cart_items = $this->items;
             }
 
-            $this->discount = wpinv_get_cart_items_discount_amount( $cart_items , $this->discounts );
+            $this->discount = wpinv_get_cart_items_discount_amount($cart_items, $this->discounts);
         }
-        $discount   = wpinv_round_amount( $this->discount );
+        $discount   = wpinv_round_amount($this->discount);
         $dash       = $dash && $discount > 0 ? '&ndash;' : '';
         
-        if ( $currency ) {
-            $discount = wpinv_price( wpinv_format_amount( $discount, NULL, !$currency ), $this->get_currency() );
+        if ($currency) {
+            $discount = wpinv_price(wpinv_format_amount($discount, NULL, !$currency), $this->get_currency());
         }
         
-        $discount   = $dash . $discount;
+        $discount = $dash . $discount;
         
-        return apply_filters( 'wpinv_get_invoice_discount', $discount, $this->ID, $this, $currency, $dash );
+        return apply_filters('wpinv_get_invoice_discount', $discount, $this->ID, $this, $currency, $dash);
     }
     
     public function get_discount_code() {
         return $this->discount_code;
     }
     
-    public function get_tax( $currency = false ) {
-        $tax = wpinv_round_amount( $this->tax );
+    public function get_tax($currency = false) {
+        $tax = wpinv_round_amount($this->tax);
         
-        if ( $currency ) {
-            $tax = wpinv_price( wpinv_format_amount( $tax, NULL, !$currency ), $this->get_currency() );
+        if ($currency) {
+            $tax = wpinv_price(wpinv_format_amount($tax, NULL, !$currency), $this->get_currency());
         }
         
-        return apply_filters( 'wpinv_get_invoice_tax', $tax, $this->ID, $this, $currency );
+        return apply_filters('wpinv_get_invoice_tax', $tax, $this->ID, $this, $currency);
     }
     
-    public function get_fees( $type = 'all' ) {
-        $fees    = array();
+    public function get_fees($type = 'all') {
+        $fees = array();
 
-        if ( ! empty( $this->fees ) && is_array( $this->fees ) ) {
-            foreach ( $this->fees as $fee ) {
-                if( 'all' != $type && ! empty( $fee['type'] ) && $type != $fee['type'] ) {
+        if (!empty($this->fees) && is_array($this->fees)) {
+            foreach ($this->fees as $fee) {
+                if ('all' != $type && !empty($fee['type']) && $type != $fee['type']) {
                     continue;
                 }
 
-                $fee['label'] = stripslashes( $fee['label'] );
-                $fee['amount_display'] = wpinv_price( $fee['amount'], $this->get_currency() );
-                $fees[]    = $fee;
+                $fee['label'] = stripslashes($fee['label']);
+                $fee['amount_display'] = wpinv_price($fee['amount'], $this->get_currency());
+                $fees[] = $fee;
             }
         }
 
-        return apply_filters( 'wpinv_get_invoice_fees', $fees, $this->ID, $this );
+        return apply_filters('wpinv_get_invoice_fees', $fees, $this->ID, $this);
     }
     
-    public function get_fees_total( $type = 'all' ) {
+    public function get_fees_total($type = 'all') {
         $fees_total = (float) 0.00;
 
-        $payment_fees = isset( $this->payment_meta['fees'] ) ? $this->payment_meta['fees'] : array();
-        if ( ! empty( $payment_fees ) ) {
-            foreach ( $payment_fees as $fee ) {
+        $payment_fees = isset($this->payment_meta['fees']) ? $this->payment_meta['fees'] : array();
+        if (!empty($payment_fees)) {
+            foreach ($payment_fees as $fee) {
                 $fees_total += (float) $fee['amount'];
             }
         }
 
-        return apply_filters( 'wpinv_get_invoice_fees_total', $fees_total, $this->ID, $this );
+        return apply_filters('wpinv_get_invoice_fees_total', $fees_total, $this->ID, $this);
         /*
         $fees = $this->get_fees( $type );
 
@@ -1485,116 +1485,116 @@ 
     }
 
     public function get_user_id() {
-        return apply_filters( 'wpinv_user_id', $this->user_id, $this->ID, $this );
+        return apply_filters('wpinv_user_id', $this->user_id, $this->ID, $this);
     }
     
     public function get_first_name() {
-        return apply_filters( 'wpinv_first_name', $this->first_name, $this->ID, $this );
+        return apply_filters('wpinv_first_name', $this->first_name, $this->ID, $this);
     }
     
     public function get_last_name() {
-        return apply_filters( 'wpinv_last_name', $this->last_name, $this->ID, $this );
+        return apply_filters('wpinv_last_name', $this->last_name, $this->ID, $this);
     }
     
     public function get_user_full_name() {
-        return apply_filters( 'wpinv_user_full_name', $this->full_name, $this->ID, $this );
+        return apply_filters('wpinv_user_full_name', $this->full_name, $this->ID, $this);
     }
     
     public function get_user_info() {
-        return apply_filters( 'wpinv_user_info', $this->user_info, $this->ID, $this );
+        return apply_filters('wpinv_user_info', $this->user_info, $this->ID, $this);
     }
     
     public function get_email() {
-        return apply_filters( 'wpinv_user_email', $this->email, $this->ID, $this );
+        return apply_filters('wpinv_user_email', $this->email, $this->ID, $this);
     }
     
     public function get_address() {
-        return apply_filters( 'wpinv_address', $this->address, $this->ID, $this );
+        return apply_filters('wpinv_address', $this->address, $this->ID, $this);
     }
     
     public function get_phone() {
-        return apply_filters( 'wpinv_phone', $this->phone, $this->ID, $this );
+        return apply_filters('wpinv_phone', $this->phone, $this->ID, $this);
     }
     
     public function get_number() {
-        return apply_filters( 'wpinv_number', $this->number, $this->ID, $this );
+        return apply_filters('wpinv_number', $this->number, $this->ID, $this);
     }
     
     public function get_items() {
-        return apply_filters( 'wpinv_payment_meta_items', $this->items, $this->ID, $this );
+        return apply_filters('wpinv_payment_meta_items', $this->items, $this->ID, $this);
     }
     
     public function get_key() {
-        return apply_filters( 'wpinv_key', $this->key, $this->ID, $this );
+        return apply_filters('wpinv_key', $this->key, $this->ID, $this);
     }
     
     public function get_transaction_id() {
-        return apply_filters( 'wpinv_get_invoice_transaction_id', $this->transaction_id, $this->ID, $this );
+        return apply_filters('wpinv_get_invoice_transaction_id', $this->transaction_id, $this->ID, $this);
     }
     
     public function get_gateway() {
-        return apply_filters( 'wpinv_gateway', $this->gateway, $this->ID, $this );
+        return apply_filters('wpinv_gateway', $this->gateway, $this->ID, $this);
     }
     
     public function get_gateway_title() {
-        $this->gateway_title = !empty( $this->gateway_title ) ? $this->gateway_title : wpinv_get_gateway_checkout_label( $this->gateway );
+        $this->gateway_title = !empty($this->gateway_title) ? $this->gateway_title : wpinv_get_gateway_checkout_label($this->gateway);
         
-        return apply_filters( 'wpinv_gateway_title', $this->gateway_title, $this->ID, $this );
+        return apply_filters('wpinv_gateway_title', $this->gateway_title, $this->ID, $this);
     }
     
     public function get_currency() {
-        return apply_filters( 'wpinv_currency_code', $this->currency, $this->ID, $this );
+        return apply_filters('wpinv_currency_code', $this->currency, $this->ID, $this);
     }
     
     public function get_created_date() {
-        return apply_filters( 'wpinv_created_date', $this->date, $this->ID, $this );
+        return apply_filters('wpinv_created_date', $this->date, $this->ID, $this);
     }
     
-    public function get_due_date( $display = false ) {
-        $due_date = apply_filters( 'wpinv_due_date', $this->due_date, $this->ID, $this );
+    public function get_due_date($display = false) {
+        $due_date = apply_filters('wpinv_due_date', $this->due_date, $this->ID, $this);
         
-        if ( !$display || empty( $due_date ) ) {
+        if (!$display || empty($due_date)) {
             return $due_date;
         }
         
-        return date_i18n( get_option( 'date_format' ), strtotime( $due_date ) );
+        return date_i18n(get_option('date_format'), strtotime($due_date));
     }
     
     public function get_completed_date() {
-        return apply_filters( 'wpinv_completed_date', $this->completed_date, $this->ID, $this );
+        return apply_filters('wpinv_completed_date', $this->completed_date, $this->ID, $this);
     }
     
-    public function get_invoice_date( $formatted = true ) {
+    public function get_invoice_date($formatted = true) {
         $date_completed = $this->completed_date;
         $invoice_date   = $date_completed != '' && $date_completed != '0000-00-00 00:00:00' ? $date_completed : '';
         
-        if ( $invoice_date == '' ) {
+        if ($invoice_date == '') {
             $date_created   = $this->date;
             $invoice_date   = $date_created != '' && $date_created != '0000-00-00 00:00:00' ? $date_created : '';
         }
         
-        if ( $formatted && $invoice_date ) {
-            $invoice_date   = date_i18n( get_option( 'date_format' ), strtotime( $invoice_date ) );
+        if ($formatted && $invoice_date) {
+            $invoice_date = date_i18n(get_option('date_format'), strtotime($invoice_date));
         }
 
-        return apply_filters( 'wpinv_get_invoice_date', $invoice_date, $formatted, $this->ID, $this );
+        return apply_filters('wpinv_get_invoice_date', $invoice_date, $formatted, $this->ID, $this);
     }
     
     public function get_ip() {
-        return apply_filters( 'wpinv_user_ip', $this->ip, $this->ID, $this );
+        return apply_filters('wpinv_user_ip', $this->ip, $this->ID, $this);
     }
         
-    public function has_status( $status ) {
-        return apply_filters( 'wpinv_has_status', ( is_array( $status ) && in_array( $this->get_status(), $status ) ) || $this->get_status() === $status ? true : false, $this, $status );
+    public function has_status($status) {
+        return apply_filters('wpinv_has_status', (is_array($status) && in_array($this->get_status(), $status)) || $this->get_status() === $status ? true : false, $this, $status);
     }
     
-    public function add_item( $item_id = 0, $args = array() ) {
+    public function add_item($item_id = 0, $args = array()) {
         global $wpi_current_id, $wpi_item_id;
         
-        $item = new WPInv_Item( $item_id );
+        $item = new WPInv_Item($item_id);
 
         // Bail if this post isn't a item
-        if( !$item || $item->post_type !== 'wpi_item' ) {
+        if (!$item || $item->post_type !== 'wpi_item') {
             return false;
         }
         
@@ -1613,8 +1613,8 @@ 
             'fees'          => array()
         );
 
-        $args = wp_parse_args( apply_filters( 'wpinv_add_item_args', $args, $item->ID ), $defaults );
-        $args['quantity']   = $has_quantities && $args['quantity'] > 0 ? absint( $args['quantity'] ) : 1;
+        $args = wp_parse_args(apply_filters('wpinv_add_item_args', $args, $item->ID), $defaults);
+        $args['quantity'] = $has_quantities && $args['quantity'] > 0 ? absint($args['quantity']) : 1;
 
         $wpi_current_id         = $this->ID;
         $wpi_item_id            = $item->ID;
@@ -1626,19 +1626,19 @@ 
         $found_cart_key         = false;
         
         if ($has_quantities) {
-            $this->cart_details = !empty( $this->cart_details ) ? array_values( $this->cart_details ) : $this->cart_details;
+            $this->cart_details = !empty($this->cart_details) ? array_values($this->cart_details) : $this->cart_details;
             
-            foreach ( $this->items as $key => $cart_item ) {
-                if ( (int)$item_id !== (int)$cart_item['id'] ) {
+            foreach ($this->items as $key => $cart_item) {
+                if ((int) $item_id !== (int) $cart_item['id']) {
                     continue;
                 }
 
-                $this->items[ $key ]['quantity'] += $args['quantity'];
+                $this->items[$key]['quantity'] += $args['quantity'];
                 break;
             }
             
-            foreach ( $this->cart_details as $cart_key => $cart_item ) {
-                if ( $item_id != $cart_item['id'] ) {
+            foreach ($this->cart_details as $cart_key => $cart_item) {
+                if ($item_id != $cart_item['id']) {
                     continue;
                 }
 
@@ -1650,29 +1650,29 @@ 
         if ($has_quantities && $found_cart_key !== false) {
             $cart_item          = $this->cart_details[$found_cart_key];
             $item_price         = $cart_item['item_price'];
-            $quantity           = !empty( $cart_item['quantity'] ) ? $cart_item['quantity'] : 1;
-            $tax_rate           = !empty( $cart_item['vat_rate'] ) ? $cart_item['vat_rate'] : 0;
+            $quantity           = !empty($cart_item['quantity']) ? $cart_item['quantity'] : 1;
+            $tax_rate           = !empty($cart_item['vat_rate']) ? $cart_item['vat_rate'] : 0;
             
             $new_quantity       = $quantity + $args['quantity'];
             $subtotal           = $item_price * $new_quantity;
             
             $args['quantity']   = $new_quantity;
-            $discount           = !empty( $args['discount'] ) ? $args['discount'] : 0;
-            $tax                = $subtotal > 0 && $tax_rate > 0 ? ( ( $subtotal - $discount ) * 0.01 * (float)$tax_rate ) : 0;
+            $discount           = !empty($args['discount']) ? $args['discount'] : 0;
+            $tax                = $subtotal > 0 && $tax_rate > 0 ? (($subtotal - $discount) * 0.01 * (float) $tax_rate) : 0;
             
-            $discount_increased = $discount > 0 && $subtotal > 0 && $discount > (float)$cart_item['discount'] ? $discount - (float)$cart_item['discount'] : 0;
-            $tax_increased      = $tax > 0 && $subtotal > 0 && $tax > (float)$cart_item['tax'] ? $tax - (float)$cart_item['tax'] : 0;
+            $discount_increased = $discount > 0 && $subtotal > 0 && $discount > (float) $cart_item['discount'] ? $discount - (float) $cart_item['discount'] : 0;
+            $tax_increased      = $tax > 0 && $subtotal > 0 && $tax > (float) $cart_item['tax'] ? $tax - (float) $cart_item['tax'] : 0;
             // The total increase equals the number removed * the item_price
-            $total_increased    = wpinv_round_amount( $item_price );
+            $total_increased    = wpinv_round_amount($item_price);
             
-            if ( wpinv_prices_include_tax() ) {
-                $subtotal -= wpinv_round_amount( $tax );
+            if (wpinv_prices_include_tax()) {
+                $subtotal -= wpinv_round_amount($tax);
             }
 
-            $total              = $subtotal - $discount + $tax;
+            $total = $subtotal - $discount + $tax;
 
             // Do not allow totals to go negative
-            if( $total < 0 ) {
+            if ($total < 0) {
                 $total = 0;
             }
             
@@ -1688,25 +1688,25 @@ 
             $this->cart_details[$found_cart_key] = $cart_item;
         } else {
             // Set custom price.
-            if ( $args['custom_price'] !== '' ) {
+            if ($args['custom_price'] !== '') {
                 $item_price = $args['custom_price'];
             } else {
                 // Allow overriding the price
-                if ( false !== $args['item_price'] ) {
+                if (false !== $args['item_price']) {
                     $item_price = $args['item_price'];
                 } else {
-                    $item_price = wpinv_get_item_price( $item->ID );
+                    $item_price = wpinv_get_item_price($item->ID);
                 }
             }
 
             // Sanitizing the price here so we don't have a dozen calls later
-            $item_price = wpinv_sanitize_amount( $item_price );
-            $subtotal   = wpinv_round_amount( $item_price * $args['quantity'] );
+            $item_price = wpinv_sanitize_amount($item_price);
+            $subtotal   = wpinv_round_amount($item_price * $args['quantity']);
         
-            $discount   = !empty( $args['discount'] ) ? $args['discount'] : 0;
-            $tax_class  = !empty( $args['vat_class'] ) ? $args['vat_class'] : '';
-            $tax_rate   = !empty( $args['vat_rate'] ) ? $args['vat_rate'] : 0;
-            $tax        = $subtotal > 0 && $tax_rate > 0 ? ( ( $subtotal - $discount ) * 0.01 * (float)$tax_rate ) : 0;
+            $discount   = !empty($args['discount']) ? $args['discount'] : 0;
+            $tax_class  = !empty($args['vat_class']) ? $args['vat_class'] : '';
+            $tax_rate   = !empty($args['vat_rate']) ? $args['vat_rate'] : 0;
+            $tax        = $subtotal > 0 && $tax_rate > 0 ? (($subtotal - $discount) * 0.01 * (float) $tax_rate) : 0;
 
             // Setup the items meta item
             $new_item = array(
@@ -1714,29 +1714,29 @@ 
                 'quantity' => $args['quantity'],
             );
 
-            $this->items[]  = $new_item;
+            $this->items[] = $new_item;
 
-            if ( wpinv_prices_include_tax() ) {
-                $subtotal -= wpinv_round_amount( $tax );
+            if (wpinv_prices_include_tax()) {
+                $subtotal -= wpinv_round_amount($tax);
             }
 
-            $total      = $subtotal - $discount + $tax;
+            $total = $subtotal - $discount + $tax;
 
             // Do not allow totals to go negative
-            if( $total < 0 ) {
+            if ($total < 0) {
                 $total = 0;
             }
         
             $this->cart_details[] = array(
                 'name'          => !empty($args['name']) ? $args['name'] : $item->get_name(),
                 'id'            => $item->ID,
-                'item_price'    => wpinv_round_amount( $item_price ),
-                'custom_price'  => ( $args['custom_price'] !== '' ? wpinv_round_amount( $args['custom_price'] ) : '' ),
+                'item_price'    => wpinv_round_amount($item_price),
+                'custom_price'  => ($args['custom_price'] !== '' ? wpinv_round_amount($args['custom_price']) : ''),
                 'quantity'      => $args['quantity'],
                 'discount'      => $discount,
-                'subtotal'      => wpinv_round_amount( $subtotal ),
-                'tax'           => wpinv_round_amount( $tax ),
-                'price'         => wpinv_round_amount( $total ),
+                'subtotal'      => wpinv_round_amount($subtotal),
+                'tax'           => wpinv_round_amount($tax),
+                'price'         => wpinv_round_amount($total),
                 'vat_rate'      => $tax_rate,
                 'vat_class'     => $tax_class,
                 'meta'          => $args['meta'],
@@ -1746,18 +1746,18 @@ 
             $subtotal = $subtotal - $discount;
         }
         
-        $added_item = end( $this->cart_details );
-        $added_item['action']  = 'add';
+        $added_item = end($this->cart_details);
+        $added_item['action'] = 'add';
         
         $this->pending['items'][] = $added_item;
         
-        $this->increase_subtotal( $subtotal );
-        $this->increase_tax( $tax );
+        $this->increase_subtotal($subtotal);
+        $this->increase_tax($tax);
 
         return true;
     }
     
-    public function remove_item( $item_id, $args = array() ) {
+    public function remove_item($item_id, $args = array()) {
         // Set some defaults
         $defaults = array(
             'quantity'      => 1,
@@ -1765,51 +1765,51 @@ 
             'custom_price'  => '',
             'cart_index'    => false,
         );
-        $args = wp_parse_args( $args, $defaults );
+        $args = wp_parse_args($args, $defaults);
 
         // Bail if this post isn't a item
-        if ( get_post_type( $item_id ) !== 'wpi_item' ) {
+        if (get_post_type($item_id) !== 'wpi_item') {
             return false;
         }
         
-        $this->cart_details = !empty( $this->cart_details ) ? array_values( $this->cart_details ) : $this->cart_details;
+        $this->cart_details = !empty($this->cart_details) ? array_values($this->cart_details) : $this->cart_details;
 
-        foreach ( $this->items as $key => $item ) {
-            if ( !empty($item['id']) && (int)$item_id !== (int)$item['id'] ) {
+        foreach ($this->items as $key => $item) {
+            if (!empty($item['id']) && (int) $item_id !== (int) $item['id']) {
                 continue;
             }
 
-            if ( false !== $args['cart_index'] ) {
-                $cart_index = absint( $args['cart_index'] );
-                $cart_item  = ! empty( $this->cart_details[ $cart_index ] ) ? $this->cart_details[ $cart_index ] : false;
+            if (false !== $args['cart_index']) {
+                $cart_index = absint($args['cart_index']);
+                $cart_item  = !empty($this->cart_details[$cart_index]) ? $this->cart_details[$cart_index] : false;
 
-                if ( ! empty( $cart_item ) ) {
+                if (!empty($cart_item)) {
                     // If the cart index item isn't the same item ID, don't remove it
-                    if ( !empty($cart_item['id']) && $cart_item['id'] != $item['id'] ) {
+                    if (!empty($cart_item['id']) && $cart_item['id'] != $item['id']) {
                         continue;
                     }
                 }
             }
 
-            $item_quantity = $this->items[ $key ]['quantity'];
-            if ( $item_quantity > $args['quantity'] ) {
-                $this->items[ $key ]['quantity'] -= $args['quantity'];
+            $item_quantity = $this->items[$key]['quantity'];
+            if ($item_quantity > $args['quantity']) {
+                $this->items[$key]['quantity'] -= $args['quantity'];
                 break;
             } else {
-                unset( $this->items[ $key ] );
+                unset($this->items[$key]);
                 break;
             }
         }
 
         $found_cart_key = false;
-        if ( false === $args['cart_index'] ) {
-            foreach ( $this->cart_details as $cart_key => $item ) {
-                if ( $item_id != $item['id'] ) {
+        if (false === $args['cart_index']) {
+            foreach ($this->cart_details as $cart_key => $item) {
+                if ($item_id != $item['id']) {
                     continue;
                 }
 
-                if ( false !== $args['item_price'] ) {
-                    if ( isset( $item['item_price'] ) && (float) $args['item_price'] != (float) $item['item_price'] ) {
+                if (false !== $args['item_price']) {
+                    if (isset($item['item_price']) && (float) $args['item_price'] != (float) $item['item_price']) {
                         continue;
                     }
                 }
@@ -1818,13 +1818,13 @@ 
                 break;
             }
         } else {
-            $cart_index = absint( $args['cart_index'] );
+            $cart_index = absint($args['cart_index']);
 
-            if ( ! array_key_exists( $cart_index, $this->cart_details ) ) {
+            if (!array_key_exists($cart_index, $this->cart_details)) {
                 return false; // Invalid cart index passed.
             }
 
-            if ( (int) $this->cart_details[ $cart_index ]['id'] > 0 && (int) $this->cart_details[ $cart_index ]['id'] !== (int) $item_id ) {
+            if ((int) $this->cart_details[$cart_index]['id'] > 0 && (int) $this->cart_details[$cart_index]['id'] !== (int) $item_id) {
                 return false; // We still need the proper Item ID to be sure.
             }
 
@@ -1832,41 +1832,41 @@ 
         }
         
         $cart_item  = $this->cart_details[$found_cart_key];
-        $quantity   = !empty( $cart_item['quantity'] ) ? $cart_item['quantity'] : 1;
+        $quantity   = !empty($cart_item['quantity']) ? $cart_item['quantity'] : 1;
         
-        if ( count( $this->cart_details ) == 1 && ( $quantity - $args['quantity'] ) < 1 ) {
+        if (count($this->cart_details) == 1 && ($quantity - $args['quantity']) < 1) {
             return false; // Invoice must contain at least one item.
         }
         
-        $discounts  = $this->get_discounts();
+        $discounts = $this->get_discounts();
         
-        if ( $quantity > $args['quantity'] ) {
+        if ($quantity > $args['quantity']) {
             $item_price         = $cart_item['item_price'];
-            $tax_rate           = !empty( $cart_item['vat_rate'] ) ? $cart_item['vat_rate'] : 0;
+            $tax_rate           = !empty($cart_item['vat_rate']) ? $cart_item['vat_rate'] : 0;
             
-            $new_quantity       = max( $quantity - $args['quantity'], 1);
+            $new_quantity       = max($quantity - $args['quantity'], 1);
             $subtotal           = $item_price * $new_quantity;
             
             $args['quantity']   = $new_quantity;
-            $discount           = !empty( $cart_item['discount'] ) ? $cart_item['discount'] : 0;
-            $tax                = $subtotal > 0 && $tax_rate > 0 ? ( ( $subtotal - $discount ) * 0.01 * (float)$tax_rate ) : 0;
+            $discount           = !empty($cart_item['discount']) ? $cart_item['discount'] : 0;
+            $tax                = $subtotal > 0 && $tax_rate > 0 ? (($subtotal - $discount) * 0.01 * (float) $tax_rate) : 0;
             
-            $discount_decrease  = (float)$cart_item['discount'] > 0 && $quantity > 0 ? wpinv_round_amount( ( (float)$cart_item['discount'] / $quantity ) ) : 0;
-            $discount_decrease  = $discount > 0 && $subtotal > 0 && (float)$cart_item['discount'] > $discount ? (float)$cart_item['discount'] - $discount : $discount_decrease; 
-            $tax_decrease       = (float)$cart_item['tax'] > 0 && $quantity > 0 ? wpinv_round_amount( ( (float)$cart_item['tax'] / $quantity ) ) : 0;
-            $tax_decrease       = $tax > 0 && $subtotal > 0 && (float)$cart_item['tax'] > $tax ? (float)$cart_item['tax'] - $tax : $tax_decrease;
+            $discount_decrease  = (float) $cart_item['discount'] > 0 && $quantity > 0 ? wpinv_round_amount(((float) $cart_item['discount'] / $quantity)) : 0;
+            $discount_decrease  = $discount > 0 && $subtotal > 0 && (float) $cart_item['discount'] > $discount ? (float) $cart_item['discount'] - $discount : $discount_decrease; 
+            $tax_decrease       = (float) $cart_item['tax'] > 0 && $quantity > 0 ? wpinv_round_amount(((float) $cart_item['tax'] / $quantity)) : 0;
+            $tax_decrease       = $tax > 0 && $subtotal > 0 && (float) $cart_item['tax'] > $tax ? (float) $cart_item['tax'] - $tax : $tax_decrease;
             
             // The total increase equals the number removed * the item_price
-            $total_decrease     = wpinv_round_amount( $item_price );
+            $total_decrease     = wpinv_round_amount($item_price);
             
-            if ( wpinv_prices_include_tax() ) {
-                $subtotal -= wpinv_round_amount( $tax );
+            if (wpinv_prices_include_tax()) {
+                $subtotal -= wpinv_round_amount($tax);
             }
 
-            $total              = $subtotal - $discount + $tax;
+            $total = $subtotal - $discount + $tax;
 
             // Do not allow totals to go negative
-            if( $total < 0 ) {
+            if ($total < 0) {
                 $total = 0;
             }
             
@@ -1885,16 +1885,16 @@ 
             
             $this->cart_details[$found_cart_key] = $cart_item;
             
-            $remove_item = end( $this->cart_details );
+            $remove_item = end($this->cart_details);
         } else {
             $item_price     = $cart_item['item_price'];
-            $discount       = !empty( $cart_item['discount'] ) ? $cart_item['discount'] : 0;
-            $tax            = !empty( $cart_item['tax'] ) ? $cart_item['tax'] : 0;
+            $discount       = !empty($cart_item['discount']) ? $cart_item['discount'] : 0;
+            $tax            = !empty($cart_item['tax']) ? $cart_item['tax'] : 0;
         
-            $subtotal_decrease  = ( $item_price * $quantity ) - $discount;
+            $subtotal_decrease  = ($item_price * $quantity) - $discount;
             $tax_decrease       = $tax;
 
-            unset( $this->cart_details[$found_cart_key] );
+            unset($this->cart_details[$found_cart_key]);
             
             $remove_item             = $args;
             $remove_item['id']       = $item_id;
@@ -1905,8 +1905,8 @@ 
         $remove_item['action']      = 'remove';
         $this->pending['items'][]   = $remove_item;
                
-        $this->decrease_subtotal( $subtotal_decrease );
-        $this->decrease_tax( $tax_decrease );
+        $this->decrease_subtotal($subtotal_decrease);
+        $this->decrease_tax($tax_decrease);
         
         return true;
     }
@@ -1914,7 +1914,7 @@ 
     public function update_items($temp = false) {
         global $wpinv_euvat, $wpi_current_id, $wpi_item_id, $wpi_nosave;
         
-        if ( !empty( $this->cart_details ) ) {
+        if (!empty($this->cart_details)) {
             $wpi_nosave             = $temp;
             $cart_subtotal          = 0;
             $cart_discount          = 0;
@@ -1924,61 +1924,61 @@ 
             $_POST['wpinv_country'] = $this->country;
             $_POST['wpinv_state']   = $this->state;
             
-            foreach ( $this->cart_details as $key => $item ) {
+            foreach ($this->cart_details as $key => $item) {
                 $item_price = $item['item_price'];
-                $quantity   = wpinv_item_quantities_enabled() && $item['quantity'] > 0 ? absint( $item['quantity'] ) : 1;
-                $amount     = wpinv_round_amount( $item_price * $quantity );
+                $quantity   = wpinv_item_quantities_enabled() && $item['quantity'] > 0 ? absint($item['quantity']) : 1;
+                $amount     = wpinv_round_amount($item_price * $quantity);
                 $subtotal   = $item_price * $quantity;
                 
                 $wpi_current_id         = $this->ID;
                 $wpi_item_id            = $item['id'];
                 
-                $discount   = wpinv_get_cart_item_discount_amount( $item, $this->get_discounts() );
+                $discount   = wpinv_get_cart_item_discount_amount($item, $this->get_discounts());
                 
-                $tax_rate   = wpinv_get_tax_rate( $this->country, $this->state, $wpi_item_id );
-                $tax_class  = $wpinv_euvat->get_item_class( $wpi_item_id );
-                $tax        = $item_price > 0 ? ( ( $subtotal - $discount ) * 0.01 * (float)$tax_rate ) : 0;
+                $tax_rate   = wpinv_get_tax_rate($this->country, $this->state, $wpi_item_id);
+                $tax_class  = $wpinv_euvat->get_item_class($wpi_item_id);
+                $tax        = $item_price > 0 ? (($subtotal - $discount) * 0.01 * (float) $tax_rate) : 0;
 
-                if ( wpinv_prices_include_tax() ) {
-                    $subtotal -= wpinv_round_amount( $tax );
+                if (wpinv_prices_include_tax()) {
+                    $subtotal -= wpinv_round_amount($tax);
                 }
 
-                $total      = $subtotal - $discount + $tax;
+                $total = $subtotal - $discount + $tax;
 
                 // Do not allow totals to go negative
-                if( $total < 0 ) {
+                if ($total < 0) {
                     $total = 0;
                 }
 
                 $cart_details[] = array(
                     'id'          => $item['id'],
                     'name'        => $item['name'],
-                    'item_price'  => wpinv_round_amount( $item_price ),
-                    'custom_price'=> ( isset( $item['custom_price'] ) ? $item['custom_price'] : '' ),
+                    'item_price'  => wpinv_round_amount($item_price),
+                    'custom_price'=> (isset($item['custom_price']) ? $item['custom_price'] : ''),
                     'quantity'    => $quantity,
                     'discount'    => $discount,
-                    'subtotal'    => wpinv_round_amount( $subtotal ),
-                    'tax'         => wpinv_round_amount( $tax ),
-                    'price'       => wpinv_round_amount( $total ),
+                    'subtotal'    => wpinv_round_amount($subtotal),
+                    'tax'         => wpinv_round_amount($tax),
+                    'price'       => wpinv_round_amount($total),
                     'vat_rate'    => $tax_rate,
                     'vat_class'   => $tax_class,
                     'meta'        => isset($item['meta']) ? $item['meta'] : array(),
                     'fees'        => isset($item['fees']) ? $item['fees'] : array(),
                 );
                 
-                $cart_subtotal  += (float)($subtotal - $discount); // TODO
-                $cart_discount  += (float)($discount);
-                $cart_tax       += (float)($tax);
+                $cart_subtotal  += (float) ($subtotal - $discount); // TODO
+                $cart_discount  += (float) ($discount);
+                $cart_tax       += (float) ($tax);
             }
-            if ( $cart_subtotal < 0 ) {
+            if ($cart_subtotal < 0) {
                 $cart_subtotal = 0;
             }
-            if ( $cart_tax < 0 ) {
+            if ($cart_tax < 0) {
                 $cart_tax = 0;
             }
-            $this->subtotal = wpinv_round_amount( $cart_subtotal );
-            $this->tax      = wpinv_round_amount( $cart_tax );
-            $this->discount = wpinv_round_amount( $cart_discount );
+            $this->subtotal = wpinv_round_amount($cart_subtotal);
+            $this->tax      = wpinv_round_amount($cart_tax);
+            $this->discount = wpinv_round_amount($cart_discount);
             
             $this->recalculate_total();
             
@@ -1990,177 +1990,177 @@ 
     
     public function recalculate_totals($temp = false) {        
         $this->update_items($temp);
-        $this->save( true );
+        $this->save(true);
         
         return $this;
     }
     
     public function needs_payment() {
-        $valid_invoice_statuses = apply_filters( 'wpinv_valid_invoice_statuses_for_payment', array( 'wpi-pending' ), $this );
+        $valid_invoice_statuses = apply_filters('wpinv_valid_invoice_statuses_for_payment', array('wpi-pending'), $this);
 
-        if ( $this->has_status( $valid_invoice_statuses ) && ( $this->get_total() > 0 || $this->is_free_trial() || $this->is_free() || $this->is_initial_free() ) ) {
+        if ($this->has_status($valid_invoice_statuses) && ($this->get_total() > 0 || $this->is_free_trial() || $this->is_free() || $this->is_initial_free())) {
             $needs_payment = true;
         } else {
             $needs_payment = false;
         }
 
-        return apply_filters( 'wpinv_needs_payment', $needs_payment, $this, $valid_invoice_statuses );
+        return apply_filters('wpinv_needs_payment', $needs_payment, $this, $valid_invoice_statuses);
     }
     
-    public function get_checkout_payment_url( $with_key = false, $secret = false ) {
+    public function get_checkout_payment_url($with_key = false, $secret = false) {
         $pay_url = wpinv_get_checkout_uri();
 
-        if ( is_ssl() ) {
-            $pay_url = str_replace( 'http:', 'https:', $pay_url );
+        if (is_ssl()) {
+            $pay_url = str_replace('http:', 'https:', $pay_url);
         }
         
         $key = $this->get_key();
 
-        if ( $with_key ) {
-            $pay_url = add_query_arg( 'invoice_key', $key, $pay_url );
+        if ($with_key) {
+            $pay_url = add_query_arg('invoice_key', $key, $pay_url);
         } else {
-            $pay_url = add_query_arg( array( 'wpi_action' => 'pay_for_invoice', 'invoice_key' => $key ), $pay_url );
+            $pay_url = add_query_arg(array('wpi_action' => 'pay_for_invoice', 'invoice_key' => $key), $pay_url);
         }
         
-        if ( $secret ) {
-            $pay_url = add_query_arg( array( '_wpipay' => md5( $this->get_user_id() . '::' . $this->get_email() . '::' . $key ) ), $pay_url );
+        if ($secret) {
+            $pay_url = add_query_arg(array('_wpipay' => md5($this->get_user_id() . '::' . $this->get_email() . '::' . $key)), $pay_url);
         }
 
-        return apply_filters( 'wpinv_get_checkout_payment_url', $pay_url, $this, $with_key, $secret );
+        return apply_filters('wpinv_get_checkout_payment_url', $pay_url, $this, $with_key, $secret);
     }
     
-    public function get_view_url( $with_key = false ) {
-        $invoice_url = get_permalink( $this->ID );
+    public function get_view_url($with_key = false) {
+        $invoice_url = get_permalink($this->ID);
 
-        if ( $with_key ) {
-            $invoice_url = add_query_arg( 'invoice_key', $this->get_key(), $invoice_url );
+        if ($with_key) {
+            $invoice_url = add_query_arg('invoice_key', $this->get_key(), $invoice_url);
         }
 
-        return apply_filters( 'wpinv_get_view_url', $invoice_url, $this, $with_key );
+        return apply_filters('wpinv_get_view_url', $invoice_url, $this, $with_key);
     }
     
-    public function generate_key( $string = '' ) {
-        $auth_key  = defined( 'AUTH_KEY' ) ? AUTH_KEY : '';
-        return strtolower( md5( $string . date( 'Y-m-d H:i:s' ) . $auth_key . uniqid( 'wpinv', true ) ) );  // Unique key
+    public function generate_key($string = '') {
+        $auth_key = defined('AUTH_KEY') ? AUTH_KEY : '';
+        return strtolower(md5($string . date('Y-m-d H:i:s') . $auth_key . uniqid('wpinv', true))); // Unique key
     }
     
     public function is_recurring() {
-        if ( empty( $this->cart_details ) ) {
+        if (empty($this->cart_details)) {
             return false;
         }
         
         $has_subscription = false;
-        foreach( $this->cart_details as $cart_item ) {
-            if ( !empty( $cart_item['id'] ) && wpinv_is_recurring_item( $cart_item['id'] )  ) {
+        foreach ($this->cart_details as $cart_item) {
+            if (!empty($cart_item['id']) && wpinv_is_recurring_item($cart_item['id'])) {
                 $has_subscription = true;
                 break;
             }
         }
         
-        if ( count( $this->cart_details ) > 1 ) {
+        if (count($this->cart_details) > 1) {
             $has_subscription = false;
         }
 
-        return apply_filters( 'wpinv_invoice_has_recurring_item', $has_subscription, $this->cart_details );
+        return apply_filters('wpinv_invoice_has_recurring_item', $has_subscription, $this->cart_details);
     }
     
     public function is_free_trial() {
         $is_free_trial = false;
         
-        if ( $this->is_parent() && $item = $this->get_recurring( true ) ) {
-            if ( !empty( $item ) && $item->has_free_trial() ) {
+        if ($this->is_parent() && $item = $this->get_recurring(true)) {
+            if (!empty($item) && $item->has_free_trial()) {
                 $is_free_trial = true;
             }
         }
 
-        return apply_filters( 'wpinv_invoice_is_free_trial', $is_free_trial, $this->cart_details );
+        return apply_filters('wpinv_invoice_is_free_trial', $is_free_trial, $this->cart_details);
     }
     
     public function is_initial_free() {
         $is_initial_free = false;
         
-        if ( ! ( (float)wpinv_round_amount( $this->get_total() ) > 0 ) && $this->is_parent() && $this->is_recurring() && ! $this->is_free_trial() && ! $this->is_free() ) {
+        if (!((float) wpinv_round_amount($this->get_total()) > 0) && $this->is_parent() && $this->is_recurring() && !$this->is_free_trial() && !$this->is_free()) {
             $is_initial_free = true;
         }
 
-        return apply_filters( 'wpinv_invoice_is_initial_free', $is_initial_free, $this->cart_details );
+        return apply_filters('wpinv_invoice_is_initial_free', $is_initial_free, $this->cart_details);
     }
     
-    public function get_recurring( $object = false ) {
+    public function get_recurring($object = false) {
         $item = NULL;
         
-        if ( empty( $this->cart_details ) ) {
+        if (empty($this->cart_details)) {
             return $item;
         }
         
-        foreach( $this->cart_details as $cart_item ) {
-            if ( !empty( $cart_item['id'] ) && wpinv_is_recurring_item( $cart_item['id'] )  ) {
+        foreach ($this->cart_details as $cart_item) {
+            if (!empty($cart_item['id']) && wpinv_is_recurring_item($cart_item['id'])) {
                 $item = $cart_item['id'];
                 break;
             }
         }
         
-        if ( $object ) {
-            $item = $item ? new WPInv_Item( $item ) : NULL;
+        if ($object) {
+            $item = $item ? new WPInv_Item($item) : NULL;
             
-            apply_filters( 'wpinv_invoice_get_recurring_item', $item, $this );
+            apply_filters('wpinv_invoice_get_recurring_item', $item, $this);
         }
 
-        return apply_filters( 'wpinv_invoice_get_recurring_item_id', $item, $this );
+        return apply_filters('wpinv_invoice_get_recurring_item_id', $item, $this);
     }
     
     public function get_subscription_name() {
-        $item = $this->get_recurring( true );
+        $item = $this->get_recurring(true);
         
-        if ( empty( $item ) ) {
+        if (empty($item)) {
             return NULL;
         }
         
-        if ( !($name = $item->get_name()) ) {
+        if (!($name = $item->get_name())) {
             $name = $item->post_name;
         }
 
-        return apply_filters( 'wpinv_invoice_get_subscription_name', $name, $this );
+        return apply_filters('wpinv_invoice_get_subscription_name', $name, $this);
     }
     
     public function get_subscription_id() {
-        $subscription_id = $this->get_meta( '_wpinv_subscr_profile_id', true );
+        $subscription_id = $this->get_meta('_wpinv_subscr_profile_id', true);
         
-        if ( empty( $subscription_id ) && !empty( $this->parent_invoice ) ) {
-            $parent_invoice = wpinv_get_invoice( $this->parent_invoice );
+        if (empty($subscription_id) && !empty($this->parent_invoice)) {
+            $parent_invoice = wpinv_get_invoice($this->parent_invoice);
             
-            $subscription_id = $parent_invoice->get_meta( '_wpinv_subscr_profile_id', true );
+            $subscription_id = $parent_invoice->get_meta('_wpinv_subscr_profile_id', true);
         }
         
         return $subscription_id;
     }
     
     public function is_parent() {
-        $is_parent = empty( $this->parent_invoice ) ? true : false;
+        $is_parent = empty($this->parent_invoice) ? true : false;
 
-        return apply_filters( 'wpinv_invoice_is_parent', $is_parent, $this );
+        return apply_filters('wpinv_invoice_is_parent', $is_parent, $this);
     }
     
     public function is_renewal() {
         $is_renewal = $this->parent_invoice && $this->parent_invoice != $this->ID ? true : false;
 
-        return apply_filters( 'wpinv_invoice_is_renewal', $is_renewal, $this );
+        return apply_filters('wpinv_invoice_is_renewal', $is_renewal, $this);
     }
     
     public function get_parent_payment() {
         $parent_payment = NULL;
         
-        if ( $this->is_renewal() ) {
-            $parent_payment = wpinv_get_invoice( $this->parent_invoice );
+        if ($this->is_renewal()) {
+            $parent_payment = wpinv_get_invoice($this->parent_invoice);
         }
         
         return $parent_payment;
     }
     
     public function is_paid() {
-        $is_paid = $this->has_status( array( 'publish', 'wpi-processing', 'wpi-renewal' ) );
+        $is_paid = $this->has_status(array('publish', 'wpi-processing', 'wpi-renewal'));
 
-        return apply_filters( 'wpinv_invoice_is_paid', $is_paid, $this );
+        return apply_filters('wpinv_invoice_is_paid', $is_paid, $this);
     }
 
     /**
@@ -2173,23 +2173,23 @@ 
     }
     
     public function is_refunded() {
-        $is_refunded = $this->has_status( array( 'wpi-refunded' ) );
+        $is_refunded = $this->has_status(array('wpi-refunded'));
 
-        return apply_filters( 'wpinv_invoice_is_refunded', $is_refunded, $this );
+        return apply_filters('wpinv_invoice_is_refunded', $is_refunded, $this);
     }
     
     public function is_free() {
         $is_free = false;
         
-        if ( !( (float)wpinv_round_amount( $this->get_total() ) > 0 ) ) {
-            if ( $this->is_parent() && $this->is_recurring() ) {
-                $is_free = (float)wpinv_round_amount( $this->get_recurring_details( 'total' ) ) > 0 ? false : true;
+        if (!((float) wpinv_round_amount($this->get_total()) > 0)) {
+            if ($this->is_parent() && $this->is_recurring()) {
+                $is_free = (float) wpinv_round_amount($this->get_recurring_details('total')) > 0 ? false : true;
             } else {
                 $is_free = true;
             }
         }
         
-        return apply_filters( 'wpinv_invoice_is_free', $is_free, $this );
+        return apply_filters('wpinv_invoice_is_free', $is_free, $this);
     }
     
     public function has_vat() {
@@ -2197,41 +2197,41 @@ 
         
         $requires_vat = false;
         
-        if ( $this->country ) {
+        if ($this->country) {
             $wpi_country        = $this->country;
             
-            $requires_vat       = $wpinv_euvat->requires_vat( $requires_vat, $this->get_user_id(), $wpinv_euvat->invoice_has_digital_rule( $this ) );
+            $requires_vat       = $wpinv_euvat->requires_vat($requires_vat, $this->get_user_id(), $wpinv_euvat->invoice_has_digital_rule($this));
         }
         
-        return apply_filters( 'wpinv_invoice_has_vat', $requires_vat, $this );
+        return apply_filters('wpinv_invoice_has_vat', $requires_vat, $this);
     }
     
     public function refresh_item_ids() {
         $item_ids = array();
         
-        if ( !empty( $this->cart_details ) ) {
-            foreach ( $this->cart_details as $key => $item ) {
-                if ( !empty( $item['id'] ) ) {
+        if (!empty($this->cart_details)) {
+            foreach ($this->cart_details as $key => $item) {
+                if (!empty($item['id'])) {
                     $item_ids[] = $item['id'];
                 }
             }
         }
         
-        $item_ids = !empty( $item_ids ) ? implode( ',', array_unique( $item_ids ) ) : '';
+        $item_ids = !empty($item_ids) ? implode(',', array_unique($item_ids)) : '';
         
-        update_post_meta( $this->ID, '_wpinv_item_ids', $item_ids );
+        update_post_meta($this->ID, '_wpinv_item_ids', $item_ids);
     }
     
-    public function get_invoice_quote_type( $post_id ) {
-        if ( empty( $post_id ) ) {
+    public function get_invoice_quote_type($post_id) {
+        if (empty($post_id)) {
             return '';
         }
 
-        $type = get_post_type( $post_id );
+        $type = get_post_type($post_id);
 
-        if ( 'wpi_invoice' === $type ) {
+        if ('wpi_invoice' === $type) {
             $post_type = __('Invoice', 'invoicing');
-        } else{
+        } else {
             $post_type = __('Quote', 'invoicing');
         }