AyeCode / invoicing

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

Indentation +987 added lines, -987 removed lines

@@ -20,91 +20,91 @@ 
 class WPInv_REST_Items_Controller extends WP_REST_Posts_Controller {
 
     /**
-	 * Post type.
-	 *
-	 * @var string
-	 */
-	protected $post_type = 'wpi_item';
+     * Post type.
+     *
+     * @var string
+     */
+    protected $post_type = 'wpi_item';
 	
-	/**
-	 * 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 = 'items';
 		
     }
 	
-	/**
-	 * Registers the routes for the objects of the controller.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @see register_rest_route()
-	 */
-	public function register_routes() {
-
-		parent::register_routes();
-
-		register_rest_route(
-			$this->namespace,
-			'/' . $this->rest_base . '/item-types',
-			array(
-				array(
-					'methods'             => WP_REST_Server::READABLE,
-					'callback'            => array( $this, 'get_item_types' ),
-				),
-			)
-		);
-
-	}
+    /**
+     * Registers the routes for the objects of the controller.
+     *
+     * @since 1.0.13
+     *
+     * @see register_rest_route()
+     */
+    public function register_routes() {
+
+        parent::register_routes();
+
+        register_rest_route(
+            $this->namespace,
+            '/' . $this->rest_base . '/item-types',
+            array(
+                array(
+                    'methods'             => WP_REST_Server::READABLE,
+                    'callback'            => array( $this, 'get_item_types' ),
+                ),
+            )
+        );
+
+    }
 
     /**
-	 * Checks if a given request has access to read items.
+     * Checks if a given request has access to read items.
      * 
-	 *
-	 * @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 ) {
 	
-		if ( current_user_can( 'manage_options' ) ||  current_user_can( 'manage_invoicing' ) ) {
-			return true;
-		}
+        if ( current_user_can( 'manage_options' ) ||  current_user_can( 'manage_invoicing' ) ) {
+            return true;
+        }
 
-		return new WP_Error( 'rest_forbidden_context', __( 'Sorry, you are not allowed to view invoice items.', 'invoicing' ), array( 'status' => rest_authorization_required_code() ) );
+        return new WP_Error( 'rest_forbidden_context', __( 'Sorry, you are not allowed to view invoice items.', 'invoicing' ), array( 'status' => rest_authorization_required_code() ) );
 
     }
     
     /**
-	 * Retrieves a collection of invoice items.
-	 *
-	 * @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 invoice items.
+     *
+     * @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 the list of registered item query parameters.
+        // Retrieve the list of registered item query parameters.
         $registered = $this->get_collection_params();
         
         $args       = array();
@@ -117,54 +117,54 @@ 
 
         }
 
-		/**
-		 * Filters the wpinv_get_items arguments for items rest requests.
-		 *
-		 *
-		 * @since 1.0.13
-		 *
-		 *
-		 * @param array           $args    Key value array of query var to query value.
-		 * @param WP_REST_Request $request The request used.
-		 */
+        /**
+         * Filters the wpinv_get_items arguments for items rest requests.
+         *
+         *
+         * @since 1.0.13
+         *
+         *
+         * @param array           $args    Key value array of query var to query value.
+         * @param WP_REST_Request $request The request used.
+         */
         $args       = apply_filters( "wpinv_rest_get_items_arguments", $args, $request, $this );
 		
-		// Special args
-		$args[ 'return' ]   = 'objects';
-		$args[ 'paginate' ] = true;
+        // Special args
+        $args[ 'return' ]   = 'objects';
+        $args[ 'paginate' ] = true;
 
         // Run the query.
-		$query = wpinv_get_all_items( $args );
+        $query = wpinv_get_all_items( $args );
 		
-		// Prepare the retrieved items
-		$items = array();
-		foreach( $query->items as $item ) {
-
-			if ( ! $this->check_read_permission( $item ) ) {
-				continue;
-			}
-
-			$data       = $this->prepare_item_for_response( $item, $request );
-			$items[]    = $this->prepare_response_for_collection( $data );
-
-		}
-
-		// Prepare the response.
-		$response = rest_ensure_response( $items );
-		$response->header( 'X-WP-Total', (int) $query->total );
-		$response->header( 'X-WP-TotalPages', (int) $query->max_num_pages );
-
-		/**
-		 * Filters the responses for item requests.
-		 *
-		 *
-		 * @since 1.0.13
-		 *
-		 *
-		 * @param arrWP_REST_Response $response    Response object.
-		 * @param WP_REST_Request     $request The request used.
+        // Prepare the retrieved items
+        $items = array();
+        foreach( $query->items as $item ) {
+
+            if ( ! $this->check_read_permission( $item ) ) {
+                continue;
+            }
+
+            $data       = $this->prepare_item_for_response( $item, $request );
+            $items[]    = $this->prepare_response_for_collection( $data );
+
+        }
+
+        // Prepare the response.
+        $response = rest_ensure_response( $items );
+        $response->header( 'X-WP-Total', (int) $query->total );
+        $response->header( 'X-WP-TotalPages', (int) $query->max_num_pages );
+
+        /**
+         * Filters the responses for item 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 items
-		 */
+         */
         $response       = apply_filters( "wpinv_rest_items_response", $response, $request, $args );
 
         return rest_ensure_response( $response );
@@ -172,25 +172,25 @@ 
     }
 
     /**
-	 * Get the post, if the ID is valid.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param int $item_id Supplied ID.
-	 * @return WPInv_Item|WP_Error Item object if ID is valid, WP_Error otherwise.
-	 */
-	protected function get_post( $item_id ) {
+     * Get the post, if the ID is valid.
+     *
+     * @since 1.0.13
+     *
+     * @param int $item_id Supplied ID.
+     * @return WPInv_Item|WP_Error Item object if ID is valid, WP_Error otherwise.
+     */
+    protected function get_post( $item_id ) {
 		
-		$error     = new WP_Error( 'rest_item_invalid_id', __( 'Invalid item ID.', 'invoicing' ), array( 'status' => 404 ) );
+        $error     = new WP_Error( 'rest_item_invalid_id', __( 'Invalid item ID.', 'invoicing' ), array( 'status' => 404 ) );
 
         // Ids start from 1
         if ( (int) $item_id <= 0 ) {
-			return $error;
-		}
+            return $error;
+        }
 
-		$item = wpinv_get_item_by( 'id', (int) $item_id );
-		if ( empty( $item ) ) {
-			return $error;
+        $item = wpinv_get_item_by( 'id', (int) $item_id );
+        if ( empty( $item ) ) {
+            return $error;
         }
 
         return $item;
@@ -198,27 +198,27 @@ 
     }
 
     /**
-	 * Checks if a given request has access to read an invoice item.
-	 *
-	 * @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 item, WP_Error object otherwise.
-	 */
-	public function get_item_permissions_check( $request ) {
+     * Checks if a given request has access to read an invoice item.
+     *
+     * @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 item, WP_Error object otherwise.
+     */
+    public function get_item_permissions_check( $request ) {
 
         // Retrieve the item object.
         $item = $this->get_post( $request['id'] );
         
         // Ensure it is valid.
-		if ( is_wp_error( $item ) ) {
-			return $item;
-		}
+        if ( is_wp_error( $item ) ) {
+            return $item;
+        }
 
-		$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->read_post, $item->ID  ) ) {
-			return new WP_Error( 
+        if ( ! current_user_can(  $post_type->cap->read_post, $item->ID  ) ) {
+            return new WP_Error( 
                 'rest_cannot_edit', 
                 __( 'Sorry, you are not allowed to view this item.', 'invoicing' ), 
                 array( 
@@ -227,61 +227,61 @@ 
             );
         }
 
-		return $this->check_read_permission( $item );
+        return $this->check_read_permission( $item );
     }
     
     /**
-	 * Checks if an item can be read.
-	 * 
-	 * An item can be read by site admins.
-	 *
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WPInv_Item $item WPInv_Item object.
-	 * @return bool Whether the post can be read.
-	 */
-	public function check_read_permission( $item ) {
-
-		// An item can be read by an admin...
-		if ( current_user_can( 'manage_options' ) ||  current_user_can( 'manage_invoicing' ) ) {
-			return true;
-		}
-
-		return false;
+     * Checks if an item can be read.
+     * 
+     * An item can be read by site admins.
+     *
+     *
+     * @since 1.0.13
+     *
+     * @param WPInv_Item $item WPInv_Item object.
+     * @return bool Whether the post can be read.
+     */
+    public function check_read_permission( $item ) {
+
+        // An item can be read by an admin...
+        if ( current_user_can( 'manage_options' ) ||  current_user_can( 'manage_invoicing' ) ) {
+            return true;
+        }
+
+        return false;
     }
     
     /**
-	 * Retrieves a single invoice item.
-	 *
-	 * @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 item.
+     *
+     * @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 item.
         $item = $this->get_post( $request['id'] );
         
         // Abort early if it does not exist
-		if ( is_wp_error( $item ) ) {
-			return $item;
-		}
-
-		// Prepare the response
-		$response = $this->prepare_item_for_response( $item, $request );
-
-		/**
-		 * Filters the responses for single invoice item 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( $item ) ) {
+            return $item;
+        }
+
+        // Prepare the response
+        $response = $this->prepare_item_for_response( $item, $request );
+
+        /**
+         * Filters the responses for single invoice item 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_item_response", $response, $request );
 
         return rest_ensure_response( $response );
@@ -289,26 +289,26 @@ 
     }
     
     /**
-	 * Checks if a given request has access to create an invoice item.
-	 *
-	 * @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 item.
+     *
+     * @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_item_exists', __( 'Cannot create existing item.', 'invoicing' ), array( 'status' => 400 ) );
-		}
+        if ( ! empty( $request['id'] ) ) {
+            return new WP_Error( 'rest_item_exists', __( 'Cannot create existing item.', 'invoicing' ), array( 'status' => 400 ) );
+        }
 
-		if ( current_user_can( 'manage_options' ) ||  current_user_can( 'manage_invoicing' ) ) {
-			return true;
-		}
+        if ( current_user_can( 'manage_options' ) ||  current_user_can( 'manage_invoicing' ) ) {
+            return true;
+        }
 
-		$post_type = get_post_type_object( $this->post_type );
-		if ( ! current_user_can( $post_type->cap->create_posts ) ) {
-			return new WP_Error( 
+        $post_type = get_post_type_object( $this->post_type );
+        if ( ! current_user_can( $post_type->cap->create_posts ) ) {
+            return new WP_Error( 
                 'rest_cannot_create', 
                 __( 'Sorry, you are not allowed to create invoice items as this user.', 'invoicing' ), 
                 array( 
@@ -317,253 +317,253 @@ 
             );
         }
 
-		return true;
+        return true;
     }
     
     /**
-	 * Creates a single invoice item.
-	 *
-	 * @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_item_exists', __( 'Cannot create existing invoice item.', 'invoicing' ), array( 'status' => 400 ) );
-		}
+     * Creates a single invoice item.
+     *
+     * @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_item_exists', __( 'Cannot create existing invoice item.', 'invoicing' ), array( 'status' => 400 ) );
+        }
 
-		$request->set_param( 'context', 'edit' );
+        $request->set_param( 'context', 'edit' );
 
-		// Prepare the updated data.
-		$item_data = $this->prepare_item_for_database( $request );
+        // Prepare the updated data.
+        $item_data = $this->prepare_item_for_database( $request );
 
-		if ( is_wp_error( $item_data ) ) {
-			return $item_data;
-		}
+        if ( is_wp_error( $item_data ) ) {
+            return $item_data;
+        }
 
-		// Try creating the item.
+        // Try creating the item.
         $item = wpinv_create_item( $item_data, true );
 
-		if ( is_wp_error( $item ) ) {
+        if ( is_wp_error( $item ) ) {
             return $item;
-		}
-
-		// Prepare the response
-		$response = $this->prepare_item_for_response( $item, $request );
-
-		/**
-		 * Fires after a single invoice item is created or updated via the REST API.
-		 *
-		 * @since 1.0.13
-		 *
-		 * @param WPinv_Item   $item  Inserted or updated item object.
-		 * @param WP_REST_Request $request  Request object.
-		 * @param bool            $creating True when creating a post, false when updating.
-		 */
-		do_action( "wpinv_rest_insert_item", $item, $request, true );
-
-		/**
-		 * Filters the responses for creating single item requests.
-		 *
-		 *
-		 * @since 1.0.13
-		 *
-		 *
-		 * @param array           $item_data Invoice properties.
-		 * @param WP_REST_Request $request The request used.
-		 */
+        }
+
+        // Prepare the response
+        $response = $this->prepare_item_for_response( $item, $request );
+
+        /**
+         * Fires after a single invoice item is created or updated via the REST API.
+         *
+         * @since 1.0.13
+         *
+         * @param WPinv_Item   $item  Inserted or updated item object.
+         * @param WP_REST_Request $request  Request object.
+         * @param bool            $creating True when creating a post, false when updating.
+         */
+        do_action( "wpinv_rest_insert_item", $item, $request, true );
+
+        /**
+         * Filters the responses for creating single item requests.
+         *
+         *
+         * @since 1.0.13
+         *
+         *
+         * @param array           $item_data Invoice properties.
+         * @param WP_REST_Request $request The request used.
+         */
         $response       = apply_filters( "wpinv_rest_create_item_response", $response, $request );
 
         return rest_ensure_response( $response );
-	}
-
-	/**
-	 * Checks if a given request has access to update an item.
-	 *
-	 * @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 item.
-		$item = $this->get_post( $request['id'] );
-		if ( is_wp_error( $item ) ) {
-			return $item;
-		}
-
-		if ( current_user_can( 'manage_options' ) ||  current_user_can( 'manage_invoicing' ) ) {
-			return true;
-		}
-
-		return new WP_Error( 
-			'rest_cannot_edit', 
-			__( 'Sorry, you are not allowed to update this item.', 'invoicing' ), 
-			array( 
-				'status' => rest_authorization_required_code(),
-			)
-		);
-
-	}
-
-	/**
-	 * Updates a single item.
-	 *
-	 * @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 ) {
+    }
+
+    /**
+     * Checks if a given request has access to update an item.
+     *
+     * @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 item.
+        $item = $this->get_post( $request['id'] );
+        if ( is_wp_error( $item ) ) {
+            return $item;
+        }
+
+        if ( current_user_can( 'manage_options' ) ||  current_user_can( 'manage_invoicing' ) ) {
+            return true;
+        }
+
+        return new WP_Error( 
+            'rest_cannot_edit', 
+            __( 'Sorry, you are not allowed to update this item.', 'invoicing' ), 
+            array( 
+                'status' => rest_authorization_required_code(),
+            )
+        );
+
+    }
+
+    /**
+     * Updates a single item.
+     *
+     * @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 item exists.
+        // Ensure the item 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 item data is provided
+        // Abort if no item data is provided
         if( empty( $data_to_update ) ) {
             return new WP_Error( 'missing_data', __( 'An update request cannot be empty.', 'invoicing' ) );
         }
 
-		// Include the item ID
-		$data_to_update['ID'] = $request['id'];
-
-		// Update the item
-		$updated_item = wpinv_update_item( $data_to_update, true );
-
-		// Incase the update operation failed...
-		if ( is_wp_error( $updated_item ) ) {
-			return $updated_item;
-		}
-
-		// Prepare the response
-		$response = $this->prepare_item_for_response( $updated_item, $request );
-
-		/** This action is documented in includes/class-wpinv-rest-item-controller.php */
-		do_action( "wpinv_rest_insert_item", $updated_item, $request, false );
-
-		/**
-		 * Filters the responses for updating single item requests.
-		 *
-		 *
-		 * @since 1.0.13
-		 *
-		 *
-		 * @param array           $item_data Item properties.
-		 * @param WP_REST_Request $request The request used.
-		 */
+        // Include the item ID
+        $data_to_update['ID'] = $request['id'];
+
+        // Update the item
+        $updated_item = wpinv_update_item( $data_to_update, true );
+
+        // Incase the update operation failed...
+        if ( is_wp_error( $updated_item ) ) {
+            return $updated_item;
+        }
+
+        // Prepare the response
+        $response = $this->prepare_item_for_response( $updated_item, $request );
+
+        /** This action is documented in includes/class-wpinv-rest-item-controller.php */
+        do_action( "wpinv_rest_insert_item", $updated_item, $request, false );
+
+        /**
+         * Filters the responses for updating single item requests.
+         *
+         *
+         * @since 1.0.13
+         *
+         *
+         * @param array           $item_data Item properties.
+         * @param WP_REST_Request $request The request used.
+         */
         $response       = apply_filters( "wpinv_rest_update_item_response", $response,  $data_to_update, $request );
 
         return rest_ensure_response( $response );
-	}
-
-	/**
-	 * Checks if a given request has access to delete an item.
-	 *
-	 * @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 item, WP_Error object otherwise.
-	 */
-	public function delete_item_permissions_check( $request ) {
-
-		// Retrieve the item.
-		$item = $this->get_post( $request['id'] );
-		if ( is_wp_error( $item ) ) {
-			return $item;
-		}
-
-		// 
-
-		// Ensure the current user can delete the item
-		if (! wpinv_can_delete_item( $request['id'] ) ) {
-			return new WP_Error( 
+    }
+
+    /**
+     * Checks if a given request has access to delete an item.
+     *
+     * @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 item, WP_Error object otherwise.
+     */
+    public function delete_item_permissions_check( $request ) {
+
+        // Retrieve the item.
+        $item = $this->get_post( $request['id'] );
+        if ( is_wp_error( $item ) ) {
+            return $item;
+        }
+
+        // 
+
+        // Ensure the current user can delete the item
+        if (! wpinv_can_delete_item( $request['id'] ) ) {
+            return new WP_Error( 
                 'rest_cannot_delete', 
                 __( 'Sorry, you are not allowed to delete this item.', 'invoicing' ), 
                 array( 
                     'status' => rest_authorization_required_code(),
                 )
             );
-		}
-
-		return true;
-	}
-
-	/**
-	 * Deletes a single item.
-	 *
-	 * @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 ) {
+        }
+
+        return true;
+    }
+
+    /**
+     * Deletes a single item.
+     *
+     * @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 item.
-		$item = $this->get_post( $request['id'] );
-		if ( is_wp_error( $item ) ) {
-			return $item;
-		}
+        // Retrieve the item.
+        $item = $this->get_post( $request['id'] );
+        if ( is_wp_error( $item ) ) {
+            return $item;
+        }
 
-		$request->set_param( 'context', 'edit' );
+        $request->set_param( 'context', 'edit' );
 
-		// Prepare the item id
-		$id    = $item->ID;
+        // Prepare the item id
+        $id    = $item->ID;
 
-		// Prepare the response
-		$response = $this->prepare_item_for_response( $item, $request );
+        // Prepare the response
+        $response = $this->prepare_item_for_response( $item, $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 item.
-		$deleted = wp_delete_post( $id, $force_delete );
+        // Try deleting the item.
+        $deleted = wp_delete_post( $id, $force_delete );
 
-		// Abort early if we can't delete the item.
-		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 item.
+        if ( ! $deleted ) {
+            return new WP_Error( 'rest_cannot_delete', __( 'The item cannot be deleted.', 'invoicing' ), array( 'status' => 500 ) );
+        }
 
-		/**
-		 * Fires immediately after a single item is deleted or trashed via the REST API.
-		 *
-		 *
-		 * @since 1.0.13
-		 *
-		 * @param WPInv_Item    $item  The deleted or trashed item.
-		 * @param WP_REST_Request  $request  The request sent to the API.
-		 */
-		do_action( "wpinv_rest_delete_item", $item, $request );
+        /**
+         * Fires immediately after a single item is deleted or trashed via the REST API.
+         *
+         *
+         * @since 1.0.13
+         *
+         * @param WPInv_Item    $item  The deleted or trashed item.
+         * @param WP_REST_Request  $request  The request sent to the API.
+         */
+        do_action( "wpinv_rest_delete_item", $item, $request );
 
-		return $response;
+        return $response;
 
-	}
+    }
     
     
     /**
-	 * Retrieves the query params for the items collection.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @return array Collection parameters.
-	 */
-	public function get_collection_params() {
+     * Retrieves the query params for the items collection.
+     *
+     * @since 1.0.13
+     *
+     * @return array Collection parameters.
+     */
+    public function get_collection_params() {
         
         $query_params               = array(
 
@@ -577,27 +577,27 @@ 
             
             // Item types
             'type'                  => array(
-				'description'       => __( 'Type of items to fetch.', 'invoicing' ),
-				'type'              => 'array',
-				'default'           => wpinv_item_types(),
-				'items'             => array(
+                'description'       => __( 'Type of items to fetch.', 'invoicing' ),
+                'type'              => 'array',
+                'default'           => wpinv_item_types(),
+                'items'             => array(
                     'enum'          => wpinv_item_types(),
                     'type'          => 'string',
                 ),
-			),
+            ),
 			
-			// Number of results per page
+            // 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,
             ),
 
             // Exclude certain items
@@ -620,9 +620,9 @@ 
                     'date',
                     'ID',
                     'modified',
-					'title',
-					'relevance',
-					'rand'
+                    'title',
+                    'relevance',
+                    'rand'
                 ),
             ),
 
@@ -632,617 +632,617 @@ 
                 'type'        => 'string',
                 'default'     => 'DESC',
                 'enum'        => array( 'ASC', 'DESC' ),
-			),
+            ),
 			
-			// Search term
+            // Search term
             'search'                => array(
-				'description'       => __( 'Return items that match the search term.', 'invoicing' ),
-				'type'              => 'string',
+                'description'       => __( 'Return items that match the search term.', 'invoicing' ),
+                'type'              => 'string',
             ),
         );
 
-		/**
-		 * Filter collection parameters for the items controller.
-		 *
-		 *
-		 * @since 1.0.13
-		 *
-		 * @param array        $query_params JSON Schema-formatted collection parameters.
-		 */
-		return apply_filters( "wpinv_rest_items_collection_params", $query_params );
+        /**
+         * Filter collection parameters for the items controller.
+         *
+         *
+         * @since 1.0.13
+         *
+         * @param array        $query_params JSON Schema-formatted collection parameters.
+         */
+        return apply_filters( "wpinv_rest_items_collection_params", $query_params );
     }
     
     /**
-	 * 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 item 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_item = new stdClass();
-
-		// Post ID.
-		if ( isset( $request['id'] ) ) {
-			$existing_item = $this->get_post( $request['id'] );
-			if ( is_wp_error( $existing_item ) ) {
-				return $existing_item;
-			}
-
-			$prepared_item->ID 		  = $existing_item->ID;
-		}
-
-		$schema = $this->get_item_schema();
-
-		// item title.
-		if ( ! empty( $schema['properties']['name'] ) && isset( $request['name'] ) ) {
-			$prepared_item->title = sanitize_text_field( $request['name'] );
-		}
-
-		// item summary.
-		if ( ! empty( $schema['properties']['summary'] ) && isset( $request['summary'] ) ) {
-			$prepared_item->excerpt = wp_kses_post( $request['summary'] );
-		}
-
-		// item price.
-		if ( ! empty( $schema['properties']['price'] ) && isset( $request['price'] ) ) {
-			$prepared_item->price = floatval( $request['price'] );
-		}
-
-		// minimum price (for dynamc items).
-		if ( ! empty( $schema['properties']['minimum_price'] ) && isset( $request['minimum_price'] ) ) {
-			$prepared_item->minimum_price = floatval( $request['minimum_price'] );
-		}
-
-		// item status.
-		if ( ! empty( $schema['properties']['status'] ) && isset( $request['status'] ) ) {
-			$prepared_item->status = 'publish' === $request['status'] ? 'publish' : 'pending';
-		}
-
-		// item type.
-		if ( ! empty( $schema['properties']['type'] ) && isset( $request['type'] ) ) {
-			$prepared_item->type = in_array( $request['type'], wpinv_item_types() ) ? trim( strtolower( $request['type'] ) ) : 'custom';
-		}
-
-		// VAT rule.
-		if ( ! empty( $schema['properties']['vat_rule'] ) && isset( $request['vat_rule'] ) ) {
-			$prepared_item->vat_rule = 'digital' === $request['vat_rule'] ? 'digital' : 'physical';
-		}
-
-		// Simple strings.
-		foreach( array( 'custom_id', 'custom_name', 'custom_singular_name' ) as $property ) {
-
-			if ( ! empty( $schema['properties'][$property] ) && isset( $request[$property] ) ) {
-				$prepared_item->$property = sanitize_text_field( $request[$property] );
-			}
-
-		}
-
-		// Simple integers.
-		foreach( array( 'is_recurring', 'recurring_interval', 'recurring_limit', 'free_trial', 'trial_interval', 'dynamic_pricing', 'editable' ) as $property ) {
-
-			if ( ! empty( $schema['properties'][$property] ) && isset( $request[$property] ) ) {
-				$prepared_item->$property = intval( $request[$property] );
-			}
-
-		}
-
-		// Time periods.
-		foreach( array( 'recurring_period',  'trial_period' ) as $property ) {
-
-			if ( ! empty( $schema['properties'][$property] ) && isset( $request[$property] ) ) {
-				$prepared_item->$property = in_array( $request[$property], array( 'D', 'W', 'M', 'Y' ) ) ? trim( strtoupper( $request[$property] ) ) : 'D';
-			}
-
-		}
-
-		$item_data = (array) wp_unslash( $prepared_item );
-
-		/**
-		 * Filters an item before it is inserted via the REST API.
-		 *
-		 * @since 1.0.13
-		 *
-		 * @param array        $item_data An array of item data
-		 * @param WP_REST_Request $request       Request object.
-		 */
-		return apply_filters( "wpinv_rest_pre_insert_item", $item_data, $request );
-
-	}
-
-	/**
-	 * Prepares a single item output for response.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WPInv_Item   $item    item object.
-	 * @param WP_REST_Request $request Request object.
-	 * @return WP_REST_Response Response object.
-	 */
-	public function prepare_item_for_response( $item, $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;
+    }
 
-		$GLOBALS['post'] = get_post( $item->get_ID() );
+    /**
+     * Prepares a single item 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_item = new stdClass();
+
+        // Post ID.
+        if ( isset( $request['id'] ) ) {
+            $existing_item = $this->get_post( $request['id'] );
+            if ( is_wp_error( $existing_item ) ) {
+                return $existing_item;
+            }
 
-		setup_postdata( $item->get_ID() );
+            $prepared_item->ID 		  = $existing_item->ID;
+        }
 
-		// Fetch the fields to include in this response.
-		$fields = $this->get_fields_for_response( $request );
+        $schema = $this->get_item_schema();
 
-		// Base fields for every item.
-		$data = array();
+        // item title.
+        if ( ! empty( $schema['properties']['name'] ) && isset( $request['name'] ) ) {
+            $prepared_item->title = sanitize_text_field( $request['name'] );
+        }
 
-		// Set up ID
-		if ( rest_is_field_included( 'id', $fields ) ) {
-			$data['id'] = $item->get_ID();
-		}
+        // item summary.
+        if ( ! empty( $schema['properties']['summary'] ) && isset( $request['summary'] ) ) {
+            $prepared_item->excerpt = wp_kses_post( $request['summary'] );
+        }
 
+        // item price.
+        if ( ! empty( $schema['properties']['price'] ) && isset( $request['price'] ) ) {
+            $prepared_item->price = floatval( $request['price'] );
+        }
 
-		// Item properties
-		$item_properties = array(
-			'name', 'summary', 'price', 'status', 'type',
-			'vat_rule', 'vat_class',
-			'custom_id', 'custom_name', 'custom_singular_name', 
-			'editable'
-		);
+        // minimum price (for dynamc items).
+        if ( ! empty( $schema['properties']['minimum_price'] ) && isset( $request['minimum_price'] ) ) {
+            $prepared_item->minimum_price = floatval( $request['minimum_price'] );
+        }
+
+        // item status.
+        if ( ! empty( $schema['properties']['status'] ) && isset( $request['status'] ) ) {
+            $prepared_item->status = 'publish' === $request['status'] ? 'publish' : 'pending';
+        }
 
-		foreach( $item_properties as $property ) {
+        // item type.
+        if ( ! empty( $schema['properties']['type'] ) && isset( $request['type'] ) ) {
+            $prepared_item->type = in_array( $request['type'], wpinv_item_types() ) ? trim( strtolower( $request['type'] ) ) : 'custom';
+        }
 
-			if ( rest_is_field_included( $property, $fields ) && method_exists( $item, 'get_' . $property ) ) {
-				$data[$property] = call_user_func( array( $item, 'get_' . $property ) );
-			}
+        // VAT rule.
+        if ( ! empty( $schema['properties']['vat_rule'] ) && isset( $request['vat_rule'] ) ) {
+            $prepared_item->vat_rule = 'digital' === $request['vat_rule'] ? 'digital' : 'physical';
+        }
 
-		}
+        // Simple strings.
+        foreach( array( 'custom_id', 'custom_name', 'custom_singular_name' ) as $property ) {
 
-		// Dynamic pricing.
-		if( $item->supports_dynamic_pricing() ) {
+            if ( ! empty( $schema['properties'][$property] ) && isset( $request[$property] ) ) {
+                $prepared_item->$property = sanitize_text_field( $request[$property] );
+            }
 
-			if( rest_is_field_included( 'dynamic_pricing', $fields ) ) {
-				$data['dynamic_pricing'] = $item->get_is_dynamic_pricing();
-			}
+        }
 
-			if( rest_is_field_included( 'minimum_price', $fields ) ) {
-				$data['minimum_price'] = $item->get_minimum_price();
-			}
-		}
+        // Simple integers.
+        foreach( array( 'is_recurring', 'recurring_interval', 'recurring_limit', 'free_trial', 'trial_interval', 'dynamic_pricing', 'editable' ) as $property ) {
 
-		// Subscriptions.
-		if( rest_is_field_included( 'is_recurring', $fields ) ) {
-			$data['is_recurring'] = $item->get_is_recurring();
-		}
+            if ( ! empty( $schema['properties'][$property] ) && isset( $request[$property] ) ) {
+                $prepared_item->$property = intval( $request[$property] );
+            }
 
-		if( $item->is_recurring() ) {
+        }
 
-			$recurring_fields = array( 'is_recurring', 'recurring_period', 'recurring_interval', 'recurring_limit', 'free_trial' );
-			foreach( $recurring_fields as $field ) {
+        // Time periods.
+        foreach( array( 'recurring_period',  'trial_period' ) as $property ) {
 
-				if ( rest_is_field_included( $field, $fields ) && method_exists( $item, 'get_' . $field ) ) {
-					$data[$field] = call_user_func( array( $item, 'get_' . $field ) );
-				}
+            if ( ! empty( $schema['properties'][$property] ) && isset( $request[$property] ) ) {
+                $prepared_item->$property = in_array( $request[$property], array( 'D', 'W', 'M', 'Y' ) ) ? trim( strtoupper( $request[$property] ) ) : 'D';
+            }
+
+        }
+
+        $item_data = (array) wp_unslash( $prepared_item );
+
+        /**
+         * Filters an item before it is inserted via the REST API.
+         *
+         * @since 1.0.13
+         *
+         * @param array        $item_data An array of item data
+         * @param WP_REST_Request $request       Request object.
+         */
+        return apply_filters( "wpinv_rest_pre_insert_item", $item_data, $request );
+
+    }
+
+    /**
+     * Prepares a single item output for response.
+     *
+     * @since 1.0.13
+     *
+     * @param WPInv_Item   $item    item object.
+     * @param WP_REST_Request $request Request object.
+     * @return WP_REST_Response Response object.
+     */
+    public function prepare_item_for_response( $item, $request ) {
+
+        $GLOBALS['post'] = get_post( $item->get_ID() );
+
+        setup_postdata( $item->get_ID() );
+
+        // Fetch the fields to include in this response.
+        $fields = $this->get_fields_for_response( $request );
+
+        // Base fields for every item.
+        $data = array();
+
+        // Set up ID
+        if ( rest_is_field_included( 'id', $fields ) ) {
+            $data['id'] = $item->get_ID();
+        }
+
+
+        // Item properties
+        $item_properties = array(
+            'name', 'summary', 'price', 'status', 'type',
+            'vat_rule', 'vat_class',
+            'custom_id', 'custom_name', 'custom_singular_name', 
+            'editable'
+        );
+
+        foreach( $item_properties as $property ) {
+
+            if ( rest_is_field_included( $property, $fields ) && method_exists( $item, 'get_' . $property ) ) {
+                $data[$property] = call_user_func( array( $item, 'get_' . $property ) );
+            }
+
+        }
+
+        // Dynamic pricing.
+        if( $item->supports_dynamic_pricing() ) {
+
+            if( rest_is_field_included( 'dynamic_pricing', $fields ) ) {
+                $data['dynamic_pricing'] = $item->get_is_dynamic_pricing();
+            }
+
+            if( rest_is_field_included( 'minimum_price', $fields ) ) {
+                $data['minimum_price'] = $item->get_minimum_price();
+            }
+        }
+
+        // Subscriptions.
+        if( rest_is_field_included( 'is_recurring', $fields ) ) {
+            $data['is_recurring'] = $item->get_is_recurring();
+        }
+
+        if( $item->is_recurring() ) {
+
+            $recurring_fields = array( 'is_recurring', 'recurring_period', 'recurring_interval', 'recurring_limit', 'free_trial' );
+            foreach( $recurring_fields as $field ) {
+
+                if ( rest_is_field_included( $field, $fields ) && method_exists( $item, 'get_' . $field ) ) {
+                    $data[$field] = call_user_func( array( $item, 'get_' . $field ) );
+                }
 	
-			}
+            }
 
-			if( $item->has_free_trial() ) {
+            if( $item->has_free_trial() ) {
 
-				$trial_fields = array( 'trial_period', 'trial_interval' );
-				foreach( $trial_fields as $field ) {
+                $trial_fields = array( 'trial_period', 'trial_interval' );
+                foreach( $trial_fields as $field ) {
 
-					if ( rest_is_field_included( $field, $fields ) && method_exists( $item, 'get_' . $field ) ) {
-						$data[$field] = call_user_func( array( $item, 'get_' . $field ) );
-					}
+                    if ( rest_is_field_included( $field, $fields ) && method_exists( $item, 'get_' . $field ) ) {
+                        $data[$field] = call_user_func( array( $item, 'get_' . $field ) );
+                    }
 	
-				}
-
-			}
-
-		}
-
-		$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( $item );
-		$response->add_links( $links );
-
-		if ( ! empty( $links['self']['href'] ) ) {
-			$actions = $this->get_available_actions( $item, $request );
-
-			$self = $links['self']['href'];
-
-			foreach ( $actions as $rel ) {
-				$response->add_link( $rel, $self );
-			}
-		}
-
-		/**
-		 * Filters the item data for a response.
-		 *
-		 * @since 1.0.13
-		 *
-		 * @param WP_REST_Response $response The response object.
-		 * @param WPInv_Item    $item  The item object.
-		 * @param WP_REST_Request  $request  Request object.
-		 */
-		return apply_filters( "wpinv_rest_prepare_item", $response, $item, $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 item's schema, conforming to JSON Schema.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @return array Item 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 Item.
-			'properties' 		  => array(
-
-				'id'           => array(
-					'description' => __( 'Unique identifier for the item.', 'invoicing' ),
-					'type'        => 'integer',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'readonly'    => true,
-				),
-
-				'name'			  => array(
-					'description' => __( 'The name for the item.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'summary'        => array(
-					'description' => __( 'A summary for the item.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'price'        => array(
-					'description' => __( 'The price for the item.', 'invoicing' ),
-					'type'        => 'number',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'status'       => array(
-					'description' => __( 'A named status for the item.', 'invoicing' ),
-					'type'        => 'string',
-					'enum'        => array_keys( get_post_stati( array( 'internal' => false ) ) ),
-					'context'     => array( 'view', 'edit' ),
-				),
-
-				'type'       => array(
-					'description' => __( 'The item type.', 'invoicing' ),
-					'type'        => 'string',
-					'enum'        => wpinv_item_types(),
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'vat_rule'       => array(
-					'description' => __( 'VAT rule applied to the item.', 'invoicing' ),
-					'type'        => 'string',
-					'enum'        => array( 'digital', 'physical' ),
-					'context'     => array( 'view', 'edit' ),
-				),
-
-				'vat_class'       => array(
-					'description' => __( 'VAT class for the item.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit' ),
-					'readonly'    => true,
-				),
-
-				'custom_id'       => array(
-					'description' => __( 'Custom id for the item.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
+                }
+
+            }
+
+        }
+
+        $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( $item );
+        $response->add_links( $links );
+
+        if ( ! empty( $links['self']['href'] ) ) {
+            $actions = $this->get_available_actions( $item, $request );
+
+            $self = $links['self']['href'];
+
+            foreach ( $actions as $rel ) {
+                $response->add_link( $rel, $self );
+            }
+        }
+
+        /**
+         * Filters the item data for a response.
+         *
+         * @since 1.0.13
+         *
+         * @param WP_REST_Response $response The response object.
+         * @param WPInv_Item    $item  The item object.
+         * @param WP_REST_Request  $request  Request object.
+         */
+        return apply_filters( "wpinv_rest_prepare_item", $response, $item, $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 item's schema, conforming to JSON Schema.
+     *
+     * @since 1.0.13
+     *
+     * @return array Item 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 Item.
+            'properties' 		  => array(
+
+                'id'           => array(
+                    'description' => __( 'Unique identifier for the item.', 'invoicing' ),
+                    'type'        => 'integer',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'readonly'    => true,
+                ),
+
+                'name'			  => array(
+                    'description' => __( 'The name for the item.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'summary'        => array(
+                    'description' => __( 'A summary for the item.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'price'        => array(
+                    'description' => __( 'The price for the item.', 'invoicing' ),
+                    'type'        => 'number',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'status'       => array(
+                    'description' => __( 'A named status for the item.', 'invoicing' ),
+                    'type'        => 'string',
+                    'enum'        => array_keys( get_post_stati( array( 'internal' => false ) ) ),
+                    'context'     => array( 'view', 'edit' ),
+                ),
+
+                'type'       => array(
+                    'description' => __( 'The item type.', 'invoicing' ),
+                    'type'        => 'string',
+                    'enum'        => wpinv_item_types(),
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'vat_rule'       => array(
+                    'description' => __( 'VAT rule applied to the item.', 'invoicing' ),
+                    'type'        => 'string',
+                    'enum'        => array( 'digital', 'physical' ),
+                    'context'     => array( 'view', 'edit' ),
+                ),
+
+                'vat_class'       => array(
+                    'description' => __( 'VAT class for the item.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit' ),
+                    'readonly'    => true,
+                ),
+
+                'custom_id'       => array(
+                    'description' => __( 'Custom id for the item.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
 				
-				'custom_name'       => array(
-					'description' => __( 'Custom name for the item.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'custom_singular_name'       => array(
-					'description' => __( 'Custom singular name for the item.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'dynamic_pricing'        => array(
-					'description' => __( 'Whether the item allows a user to set their own price.', 'invoicing' ),
-					'type'        => 'integer',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'minimum_price'        => array(
-					'description' => __( 'For dynamic prices, this is the minimum price that a user can set.', 'invoicing' ),
-					'type'        => 'number',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'is_recurring'        => array(
-					'description' => __( 'Whether the item is a subscription item.', 'invoicing' ),
-					'type'        => 'integer',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'recurring_period'        => array(
-					'description' => __( 'The recurring period for a recurring item.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'enum'        => array( 'D', 'W', 'M', 'Y' ),
-				),
-
-				'recurring_interval'        => array(
-					'description' => __( 'The recurring interval for a subscription item.', 'invoicing' ),
-					'type'        => 'integer',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'recurring_limit'        => array(
-					'description' => __( 'The maximum number of renewals for a subscription item.', 'invoicing' ),
-					'type'        => 'integer',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'free_trial'        => array(
-					'description' => __( 'Whether the item has a free trial period.', 'invoicing' ),
-					'type'        => 'integer',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'trial_period'        => array(
-					'description' => __( 'The trial period of a recurring item.', 'invoicing' ),
-					'type'        => 'string',
-					'context'     => array( 'view', 'edit', 'embed' ),
-					'enum'        => array( 'D', 'W', 'M', 'Y' ),
-				),
-
-				'trial_interval'        => array(
-					'description' => __( 'The trial interval for a subscription item.', 'invoicing' ),
-					'type'        => 'integer',
-					'context'     => array( 'view', 'edit', 'embed' ),
-				),
-
-				'editable'        => array(
-					'description' => __( 'Whether or not the item is editable.', 'invoicing' ),
-					'type'        => 'integer',
-					'context'     => array( 'view', 'edit' ),
-				),
-
-			),
-		);
-
-		// Add helpful links to the item schem.
-		$schema['links'] = $this->get_schema_links();
-
-		/**
-		 * Filters the item schema for the REST API.
-		 *
-		 * Enables adding extra properties to items.
-		 *
-		 * @since 1.0.13
-		 *
-		 * @param array   $schema    The item schema.
-		 */
+                'custom_name'       => array(
+                    'description' => __( 'Custom name for the item.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'custom_singular_name'       => array(
+                    'description' => __( 'Custom singular name for the item.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'dynamic_pricing'        => array(
+                    'description' => __( 'Whether the item allows a user to set their own price.', 'invoicing' ),
+                    'type'        => 'integer',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'minimum_price'        => array(
+                    'description' => __( 'For dynamic prices, this is the minimum price that a user can set.', 'invoicing' ),
+                    'type'        => 'number',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'is_recurring'        => array(
+                    'description' => __( 'Whether the item is a subscription item.', 'invoicing' ),
+                    'type'        => 'integer',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'recurring_period'        => array(
+                    'description' => __( 'The recurring period for a recurring item.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'enum'        => array( 'D', 'W', 'M', 'Y' ),
+                ),
+
+                'recurring_interval'        => array(
+                    'description' => __( 'The recurring interval for a subscription item.', 'invoicing' ),
+                    'type'        => 'integer',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'recurring_limit'        => array(
+                    'description' => __( 'The maximum number of renewals for a subscription item.', 'invoicing' ),
+                    'type'        => 'integer',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'free_trial'        => array(
+                    'description' => __( 'Whether the item has a free trial period.', 'invoicing' ),
+                    'type'        => 'integer',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'trial_period'        => array(
+                    'description' => __( 'The trial period of a recurring item.', 'invoicing' ),
+                    'type'        => 'string',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                    'enum'        => array( 'D', 'W', 'M', 'Y' ),
+                ),
+
+                'trial_interval'        => array(
+                    'description' => __( 'The trial interval for a subscription item.', 'invoicing' ),
+                    'type'        => 'integer',
+                    'context'     => array( 'view', 'edit', 'embed' ),
+                ),
+
+                'editable'        => array(
+                    'description' => __( 'Whether or not the item is editable.', 'invoicing' ),
+                    'type'        => 'integer',
+                    'context'     => array( 'view', 'edit' ),
+                ),
+
+            ),
+        );
+
+        // Add helpful links to the item schem.
+        $schema['links'] = $this->get_schema_links();
+
+        /**
+         * Filters the item schema for the REST API.
+         *
+         * Enables adding extra properties to items.
+         *
+         * @since 1.0.13
+         *
+         * @param array   $schema    The item schema.
+         */
         $schema = apply_filters( "wpinv_rest_item_schema", $schema );
 
-		//  Cache the item schema.
-		$this->schema = $schema;
+        //  Cache the item 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 publish this item.' ),
-			'href'         => $href,
-			'targetSchema' => array(
-				'type'       => 'object',
-				'properties' => array(
-					'status' => array(
-						'type' => 'string',
-						'enum' => array( 'publish', 'future' ),
-					),
-				),
-			),
-		);
-
-		return $links;
-	}
-
-	/**
-	 * Prepares links for the request.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WPInv_Item $item Item Object.
-	 * @return array Links for the given item.
-	 */
-	protected function prepare_links( $item ) {
-
-		// Prepare the base REST API endpoint for items.
-		$base = sprintf( '%s/%s', $this->namespace, $this->rest_base );
-
-		// Entity meta.
-		$links = array(
-			'self'       => array(
-				'href' => rest_url( trailingslashit( $base ) . $item->ID ),
-			),
-			'collection' => array(
-				'href' => rest_url( $base ),
-			),
-		);
-
-		/**
-		 * Filters the returned item links for the REST API.
-		 *
-		 * Enables adding extra links to item API responses.
-		 *
-		 * @since 1.0.13
-		 *
-		 * @param array   $links    Rest links.
-		 */
-		return apply_filters( "wpinv_rest_item_links", $links );
-
-	}
-
-	/**
-	 * Get the link relations available for the post and current user.
-	 *
-	 * @since 1.0.13
-	 *
-	 * @param WPInv_Item   $item    Item object.
-	 * @param WP_REST_Request $request Request object.
-	 * @return array List of link relations.
-	 */
-	protected function get_available_actions( $item, $request ) {
-
-		if ( 'edit' !== $request['context'] ) {
-			return array();
-		}
-
-		$rels = array();
-
-		// Retrieve the post type object.
-		$post_type = get_post_type_object( $item->post_type );
-
-		// Mark item as published.
-		if ( current_user_can( $post_type->cap->publish_posts ) ) {
-			$rels[] = 'https://api.w.org/action-publish';
-		}
-
-		/**
-		 * Filters the available item link relations for the REST API.
-		 *
-		 * Enables adding extra link relation for the current user and request to item responses.
-		 *
-		 * @since 1.0.13
-		 *
-		 * @param array   $rels    Available link relations.
-		 */
-		return apply_filters( "wpinv_rest_item_link_relations", $rels );
-	}
-
-	/**
-	 * Handles rest requests for item types.
-	 *
-	 * @since 1.0.13
-	 * 
-	 * 
-	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
-	 */
-	public function get_item_types() {
-		return rest_ensure_response( wpinv_get_item_types() );
-	}
+        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 publish this item.' ),
+            'href'         => $href,
+            'targetSchema' => array(
+                'type'       => 'object',
+                'properties' => array(
+                    'status' => array(
+                        'type' => 'string',
+                        'enum' => array( 'publish', 'future' ),
+                    ),
+                ),
+            ),
+        );
+
+        return $links;
+    }
+
+    /**
+     * Prepares links for the request.
+     *
+     * @since 1.0.13
+     *
+     * @param WPInv_Item $item Item Object.
+     * @return array Links for the given item.
+     */
+    protected function prepare_links( $item ) {
+
+        // Prepare the base REST API endpoint for items.
+        $base = sprintf( '%s/%s', $this->namespace, $this->rest_base );
+
+        // Entity meta.
+        $links = array(
+            'self'       => array(
+                'href' => rest_url( trailingslashit( $base ) . $item->ID ),
+            ),
+            'collection' => array(
+                'href' => rest_url( $base ),
+            ),
+        );
+
+        /**
+         * Filters the returned item links for the REST API.
+         *
+         * Enables adding extra links to item API responses.
+         *
+         * @since 1.0.13
+         *
+         * @param array   $links    Rest links.
+         */
+        return apply_filters( "wpinv_rest_item_links", $links );
+
+    }
+
+    /**
+     * Get the link relations available for the post and current user.
+     *
+     * @since 1.0.13
+     *
+     * @param WPInv_Item   $item    Item object.
+     * @param WP_REST_Request $request Request object.
+     * @return array List of link relations.
+     */
+    protected function get_available_actions( $item, $request ) {
+
+        if ( 'edit' !== $request['context'] ) {
+            return array();
+        }
+
+        $rels = array();
+
+        // Retrieve the post type object.
+        $post_type = get_post_type_object( $item->post_type );
+
+        // Mark item as published.
+        if ( current_user_can( $post_type->cap->publish_posts ) ) {
+            $rels[] = 'https://api.w.org/action-publish';
+        }
+
+        /**
+         * Filters the available item link relations for the REST API.
+         *
+         * Enables adding extra link relation for the current user and request to item responses.
+         *
+         * @since 1.0.13
+         *
+         * @param array   $rels    Available link relations.
+         */
+        return apply_filters( "wpinv_rest_item_link_relations", $rels );
+    }
+
+    /**
+     * Handles rest requests for item types.
+     *
+     * @since 1.0.13
+     * 
+     * 
+     * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
+     */
+    public function get_item_types() {
+        return rest_ensure_response( wpinv_get_item_types() );
+    }
 
     
 }
\ No newline at end of file

includes/class-wpinv-api.php

Indentation +6 added lines, -6 removed lines

@@ -52,14 +52,14 @@
     }
 
 
-	/**
-	 * 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.

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

Indentation +1114 added lines, -1114 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';
@@ -52,39 +52,39 @@ 
     }
     
     /**
-	 * 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 invoices.', '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 invoices.', '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 the list of registered invoice query parameters.
+        // Retrieve the list of registered invoice query parameters.
         $registered = $this->get_collection_params();
         
         $args       = array();
@@ -97,54 +97,54 @@ 
 
         }
 
-		/**
-		 * Filters the wpinv_get_invoices arguments for invoices requests.
-		 *
-		 *
-		 * @since 1.0.13
-		 *
-		 *
-		 * @param array           $args    Key value array of query var to query value.
-		 * @param WP_REST_Request $request The request used.
-		 */
+        /**
+         * Filters the wpinv_get_invoices arguments for invoices requests.
+         *
+         *
+         * @since 1.0.13
+         *
+         *
+         * @param array           $args    Key value array of query var to query value.
+         * @param WP_REST_Request $request The request used.
+         */
         $args       = apply_filters( "wpinv_rest_get_invoices_arguments", $args, $request, $this );
 		
-		// Special args
-		$args[ 'return' ]   = 'objects';
-		$args[ 'paginate' ] = true;
+        // Special args
+        $args[ 'return' ]   = 'objects';
+        $args[ 'paginate' ] = true;
 
         // Run the query.
-		$query = wpinv_get_invoices( $args );
+        $query = wpinv_get_invoices( $args );
 		
-		// Prepare the retrieved invoices
-		$invoices = array();
-		foreach( $query->invoices as $invoice ) {
-
-			if ( ! $this->check_read_permission( $invoice ) ) {
-				continue;
-			}
-
-			$data       = $this->prepare_item_for_response( $invoice, $request );
-			$invoices[] = $this->prepare_response_for_collection( $data );
-
-		}
-
-		// Prepare the response.
-		$response = rest_ensure_response( $invoices );
-		$response->header( 'X-WP-Total', (int) $query->total );
-		$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.
+        // Prepare the retrieved invoices
+        $invoices = array();
+        foreach( $query->invoices as $invoice ) {
+
+            if ( ! $this->check_read_permission( $invoice ) ) {
+                continue;
+            }
+
+            $data       = $this->prepare_item_for_response( $invoice, $request );
+            $invoices[] = $this->prepare_response_for_collection( $data );
+
+        }
+
+        // Prepare the response.
+        $response = rest_ensure_response( $invoices );
+        $response->header( 'X-WP-Total', (int) $query->total );
+        $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 );
@@ -152,25 +152,25 @@ 
     }
 
     /**
-	 * 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 invoice ID.', 'invoicing' ), array( 'status' => 404 ) );
+        $error     = new WP_Error( 'rest_invoice_invalid_id', __( 'Invalid invoice 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 ) ) {
-			return $error;
+        $invoice = wpinv_get_invoice( (int) $invoice_id );
+        if ( empty( $invoice ) ) {
+            return $error;
         }
 
         return $invoice;
@@ -178,77 +178,77 @@ 
     }
 
     /**
-	 * 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 );
@@ -256,23 +256,23 @@ 
     }
     
     /**
-	 * 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 invoice.', 'invoicing' ), array( 'status' => 400 ) );
-		}
+        if ( ! empty( $request['id'] ) ) {
+            return new WP_Error( 'rest_invoice_exists', __( 'Cannot create existing invoice.', '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 ) ) {
-			return new WP_Error( 
+        if ( ! current_user_can( $post_type->cap->create_posts ) ) {
+            return new WP_Error( 
                 'rest_cannot_create', 
                 __( 'Sorry, you are not allowed to create invoices as this user.', 'invoicing' ), 
                 array( 
@@ -281,88 +281,88 @@ 
             );
         }
 
-		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 invoice.', 'invoicing' ), array( 'status' => 400 ) );
-		}
+     * 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 invoice.', '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 );
+        // Prepare the updated data.
+        $invoice_data = $this->prepare_item_for_database( $request );
 
-		if ( is_wp_error( $invoice_data ) ) {
-			return $invoice_data;
-		}
+        if ( is_wp_error( $invoice_data ) ) {
+            return $invoice_data;
+        }
 
-		// Try creating the invoice
+        // Try creating the invoice
         $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 invoice.', 'invoicing' ), 
                 array( 
@@ -371,162 +371,162 @@ 
             );
         }
 
-		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 new WP_Error( 
+    }
+
+    /**
+     * 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 new WP_Error( 
                 'rest_cannot_delete', 
                 __( 'Sorry, you are not allowed to delete this invoice.', 'invoicing' ), 
                 array( 
                     'status' => rest_authorization_required_code(),
                 )
             );
-		}
-
-		return true;
-	}
-
-	/**
-	 * 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 ) {
+        }
+
+        return true;
+    }
+
+    /**
+     * 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 invoice 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 invoice 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(
 
@@ -544,22 +544,22 @@ 
 
             // User.
             'user'                  => array(
-				'description'       => __( 'Limit result set to invoices for a specif user.', 'invoicing' ),
-				'type'              => 'integer',
+                'description'       => __( 'Limit result set to invoices for a specif user.', 'invoicing' ),
+                'type'              => 'integer',
             ),
             
             // Number of results per page
             'limit'                 => array(
-				'description'       => __( 'Number of invoices to fetch.', 'invoicing' ),
-				'type'              => 'integer',
-				'default'           => (int) get_option( 'posts_per_page' ),
+                'description'       => __( 'Number of invoices 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,
             ),
 
             // Exclude certain invoices
@@ -595,789 +595,789 @@ 
             ),
         );
 
-		/**
-		 * 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 );
     }
     
     /**
-	 * 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'], array_keys( wpinv_get_invoice_statuses( true, true ) ), 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'], array_keys( wpinv_get_invoice_statuses( true, true ) ), 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];
+            }
 
-		}
+        }
 
-		$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();
+
+        // 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 ) {
+
+            if ( rest_is_field_included( $property, $fields ) ) {
+                $data[$property] = $invoice->get( $property );
+            }
+
+        }
+
+        // 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() );
+        }
 
-		// Base fields for every invoice.
-		$data = array();
 
-		// Set up ID
-		if ( rest_is_field_included( 'id', $fields ) ) {
-			$data['id'] = $invoice->ID;
-		}
+        $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 );
 
-		// 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 ) {
-
-			if ( rest_is_field_included( $property, $fields ) ) {
-				$data[$property] = $invoice->get( $property );
-			}
-
-		}
-
-		// 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,
-				),
+        $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'        => array_keys( wpinv_get_invoice_statuses( true, true ) ),
-					'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'        => array_keys( wpinv_get_invoice_statuses( true, true ) ),
+                    '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 ) {
-
-		$statuses 	  = wp_parse_slug_list( $statuses );
-		$valid_statuses = array_keys( wpinv_get_invoice_statuses( true, true ) );
-		return array_intersect( $statuses, $valid_statuses );
+        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 ) {
+
+        $statuses 	  = wp_parse_slug_list( $statuses );
+        $valid_statuses = array_keys( wpinv_get_invoice_statuses( true, true ) );
+        return array_intersect( $statuses, $valid_statuses );
 		
-	}
+    }
     
 }
\ No newline at end of file