woocommerce / woocommerce-gateway-stripe

includes/class-wc-stripe-order-handler.php

Spacing +173 added lines, -173 removed lines

@@ -1,5 +1,5 @@ 
 <?php
-if ( ! defined( 'ABSPATH' ) ) {
+if ( ! defined('ABSPATH')) {
 	exit;
 }
 
@@ -20,12 +20,12 @@ 
 	public function __construct() {
 		self::$_this = $this;
 
-		add_action( 'wp', array( $this, 'maybe_process_redirect_order' ) );
-		add_action( 'woocommerce_order_status_on-hold_to_processing', array( $this, 'capture_payment' ) );
-		add_action( 'woocommerce_order_status_on-hold_to_completed', array( $this, 'capture_payment' ) );
-		add_action( 'woocommerce_order_status_on-hold_to_cancelled', array( $this, 'cancel_payment' ) );
-		add_action( 'woocommerce_order_status_on-hold_to_refunded', array( $this, 'cancel_payment' ) );
-		add_action( 'wc_ajax_wc_stripe_validate_checkout', array( $this, 'validate_checkout' ) );
+		add_action('wp', array($this, 'maybe_process_redirect_order'));
+		add_action('woocommerce_order_status_on-hold_to_processing', array($this, 'capture_payment'));
+		add_action('woocommerce_order_status_on-hold_to_completed', array($this, 'capture_payment'));
+		add_action('woocommerce_order_status_on-hold_to_cancelled', array($this, 'cancel_payment'));
+		add_action('woocommerce_order_status_on-hold_to_refunded', array($this, 'cancel_payment'));
+		add_action('wc_ajax_wc_stripe_validate_checkout', array($this, 'validate_checkout'));
 	}
 
 	/**
@@ -46,25 +46,25 @@ 
 	 * @since 4.0.0
 	 * @version 4.0.0
 	 */
-	public function process_redirect_payment( $order_id, $retry = true ) {
+	public function process_redirect_payment($order_id, $retry = true) {
 		try {
-			$source = wc_clean( $_GET['source'] );
+			$source = wc_clean($_GET['source']);
 
-			if ( empty( $source ) ) {
+			if (empty($source)) {
 				return;
 			}
 
-			if ( empty( $order_id ) ) {
+			if (empty($order_id)) {
 				return;
 			}
 
-			$order = wc_get_order( $order_id );
+			$order = wc_get_order($order_id);
 
-			if ( ! is_object( $order ) ) {
+			if ( ! is_object($order)) {
 				return;
 			}
 
-			if ( 'processing' === $order->get_status() || 'completed' === $order->get_status() || 'on-hold' === $order->get_status() ) {
+			if ('processing' === $order->get_status() || 'completed' === $order->get_status() || 'on-hold' === $order->get_status()) {
 				return;
 			}
 
@@ -72,101 +72,101 @@ 
 			$response = null;
 
 			// This will throw exception if not valid.
-			$this->validate_minimum_order_amount( $order );
+			$this->validate_minimum_order_amount($order);
 
-			WC_Stripe_Logger::log( "Info: (Redirect) Begin processing payment for order $order_id for the amount of {$order->get_total()}" );
+			WC_Stripe_Logger::log("Info: (Redirect) Begin processing payment for order $order_id for the amount of {$order->get_total()}");
 
 			// Prep source object.
 			$source_object           = new stdClass();
 			$source_object->token_id = '';
-			$source_object->customer = $this->get_stripe_customer_id( $order );
+			$source_object->customer = $this->get_stripe_customer_id($order);
 			$source_object->source   = $source;
 
 			/**
 			 * First check if the source is chargeable at this time. If not,
 			 * webhook will take care of it later.
 			 */
-			$source_info = WC_Stripe_API::retrieve( 'sources/' . $source );
+			$source_info = WC_Stripe_API::retrieve('sources/' . $source);
 
-			if ( ! empty( $source_info->error ) ) {
-				throw new Exception( $source_info->error->message );
+			if ( ! empty($source_info->error)) {
+				throw new Exception($source_info->error->message);
 			}
 
-			if ( 'failed' === $source_info->status || 'canceled' === $source_info->status ) {
-				throw new Exception( __( 'Unable to process this payment, please try again or use alternative method.', 'woocommerce-gateway-stripe' ) );
+			if ('failed' === $source_info->status || 'canceled' === $source_info->status) {
+				throw new Exception(__('Unable to process this payment, please try again or use alternative method.', 'woocommerce-gateway-stripe'));
 			}
 
 			// If already consumed, then ignore request.
-			if ( 'consumed' === $source_info->status ) {
+			if ('consumed' === $source_info->status) {
 				return;
 			}
 
 			// If not chargeable, then ignore request.
-			if ( 'chargeable' !== $source_info->status ) {
+			if ('chargeable' !== $source_info->status) {
 				return;
 			}
 
 			// Make the request.
-			$response = WC_Stripe_API::request( $this->generate_payment_request( $order, $source_object ) );
+			$response = WC_Stripe_API::request($this->generate_payment_request($order, $source_object));
 
-			if ( ! empty( $response->error ) ) {
+			if ( ! empty($response->error)) {
 				// If it is an API error such connection or server, let's retry.
-				if ( 'api_connection_error' === $response->error->type || 'api_error' === $response->error->type ) {
-					if ( $retry ) {
-						sleep( 5 );
-						return $this->process_redirect_payment( $order_id, false );
+				if ('api_connection_error' === $response->error->type || 'api_error' === $response->error->type) {
+					if ($retry) {
+						sleep(5);
+						return $this->process_redirect_payment($order_id, false);
 					} else {
 						$message = 'API connection error and retries exhausted.';
-						$order->add_order_note( $message );
-						throw new Exception( $message );
+						$order->add_order_note($message);
+						throw new Exception($message);
 					}
 				}
 
 				// Customer param wrong? The user may have been deleted on stripe's end. Remove customer_id. Can be retried without.
-				if ( preg_match( '/No such customer/i', $response->error->message ) && $retry ) {
-					delete_user_meta( WC_Stripe_Helper::is_pre_30() ? $order->customer_user : $order->get_customer_id(), '_stripe_customer_id' );
+				if (preg_match('/No such customer/i', $response->error->message) && $retry) {
+					delete_user_meta(WC_Stripe_Helper::is_pre_30() ? $order->customer_user : $order->get_customer_id(), '_stripe_customer_id');
 
-					return $this->process_redirect_payment( $order_id, false );
+					return $this->process_redirect_payment($order_id, false);
 
-				} elseif ( preg_match( '/No such token/i', $response->error->message ) && $source_object->token_id ) {
+				} elseif (preg_match('/No such token/i', $response->error->message) && $source_object->token_id) {
 					// Source param wrong? The CARD may have been deleted on stripe's end. Remove token and show message.
 
-					$wc_token = WC_Payment_Tokens::get( $source_object->token_id );
+					$wc_token = WC_Payment_Tokens::get($source_object->token_id);
 					$wc_token->delete();
-					$message = __( 'This card is no longer available and has been removed.', 'woocommerce-gateway-stripe' );
-					$order->add_order_note( $message );
-					throw new Exception( $message );
+					$message = __('This card is no longer available and has been removed.', 'woocommerce-gateway-stripe');
+					$order->add_order_note($message);
+					throw new Exception($message);
 				}
 
 				$localized_messages = WC_Stripe_Helper::get_localized_messages();
 
-				if ( 'card_error' === $response->error->type ) {
-					$message = isset( $localized_messages[ $response->error->code ] ) ? $localized_messages[ $response->error->code ] : $response->error->message;
+				if ('card_error' === $response->error->type) {
+					$message = isset($localized_messages[$response->error->code]) ? $localized_messages[$response->error->code] : $response->error->message;
 				} else {
-					$message = isset( $localized_messages[ $response->error->type ] ) ? $localized_messages[ $response->error->type ] : $response->error->message;
+					$message = isset($localized_messages[$response->error->type]) ? $localized_messages[$response->error->type] : $response->error->message;
 				}
 
-				throw new Exception( $message );
+				throw new Exception($message);
 			}
 
-			do_action( 'wc_gateway_stripe_process_redirect_payment', $response, $order );
+			do_action('wc_gateway_stripe_process_redirect_payment', $response, $order);
 
-			$this->process_response( $response, $order );
+			$this->process_response($response, $order);
 
-		} catch ( Exception $e ) {
-			WC_Stripe_Logger::log( 'Error: ' . $e->getMessage() );
+		} catch (Exception $e) {
+			WC_Stripe_Logger::log('Error: ' . $e->getMessage());
 
-			do_action( 'wc_gateway_stripe_process_redirect_payment_error', $e, $order );
+			do_action('wc_gateway_stripe_process_redirect_payment_error', $e, $order);
 
 			/* translators: error message */
-			$order->update_status( 'failed', sprintf( __( 'Stripe payment failed: %s', 'woocommerce-gateway-stripe' ), $e->getMessage() ) );
+			$order->update_status('failed', sprintf(__('Stripe payment failed: %s', 'woocommerce-gateway-stripe'), $e->getMessage()));
 
-			if ( $order->has_status( array( 'pending', 'failed' ) ) ) {
-				$this->send_failed_order_email( $order_id );
+			if ($order->has_status(array('pending', 'failed'))) {
+				$this->send_failed_order_email($order_id);
 			}
 
-			wc_add_notice( $e->getMessage(), 'error' );
-			wp_safe_redirect( wc_get_checkout_url() );
+			wc_add_notice($e->getMessage(), 'error');
+			wp_safe_redirect(wc_get_checkout_url());
 			exit;
 		}
 	}
@@ -178,13 +178,13 @@ 
 	 * @version 4.0.0
 	 */
 	public function maybe_process_redirect_order() {
-		if ( ! is_order_received_page() || empty( $_GET['client_secret'] ) || empty( $_GET['source'] ) ) {
+		if ( ! is_order_received_page() || empty($_GET['client_secret']) || empty($_GET['source'])) {
 			return;
 		}
 
-		$order_id = wc_clean( $_GET['order_id'] );
+		$order_id = wc_clean($_GET['order_id']);
 
-		$this->process_redirect_payment( $order_id );
+		$this->process_redirect_payment($order_id);
 	}
 
 	/**
@@ -194,52 +194,52 @@ 
 	 * @version 4.0.0
 	 * @param  int $order_id
 	 */
-	public function capture_payment( $order_id ) {
-		$order = wc_get_order( $order_id );
+	public function capture_payment($order_id) {
+		$order = wc_get_order($order_id);
 
-		if ( 'stripe' === ( WC_Stripe_Helper::is_pre_30() ? $order->payment_method : $order->get_payment_method() ) ) {
-			$charge   = WC_Stripe_Helper::is_pre_30() ? get_post_meta( $order_id, '_transaction_id', true ) : $order->get_transaction_id();
-			$captured = WC_Stripe_Helper::is_pre_30() ? get_post_meta( $order_id, '_stripe_charge_captured', true ) : $order->get_meta( '_stripe_charge_captured', true );
+		if ('stripe' === (WC_Stripe_Helper::is_pre_30() ? $order->payment_method : $order->get_payment_method())) {
+			$charge   = WC_Stripe_Helper::is_pre_30() ? get_post_meta($order_id, '_transaction_id', true) : $order->get_transaction_id();
+			$captured = WC_Stripe_Helper::is_pre_30() ? get_post_meta($order_id, '_stripe_charge_captured', true) : $order->get_meta('_stripe_charge_captured', true);
 
-			if ( $charge && 'no' === $captured ) {
+			if ($charge && 'no' === $captured) {
 				$order_total = $order->get_total();
 
-				if ( 0 < $order->get_total_refunded() ) {
+				if (0 < $order->get_total_refunded()) {
 					$order_total = $order_total - $order->get_total_refunded();
 				}
 
-				$result = WC_Stripe_API::request( array(
-					'amount'   => WC_Stripe_Helper::get_stripe_amount( $order_total ),
+				$result = WC_Stripe_API::request(array(
+					'amount'   => WC_Stripe_Helper::get_stripe_amount($order_total),
 					'expand[]' => 'balance_transaction',
-				), 'charges/' . $charge . '/capture' );
+				), 'charges/' . $charge . '/capture');
 
-				if ( ! empty( $result->error ) ) {
+				if ( ! empty($result->error)) {
 					/* translators: error message */
-					$order->update_status( 'failed', sprintf( __( 'Unable to capture charge! %s', 'woocommerce-gateway-stripe' ), $result->error->message ) );
+					$order->update_status('failed', sprintf(__('Unable to capture charge! %s', 'woocommerce-gateway-stripe'), $result->error->message));
 				} else {
 					/* translators: transaction id */
-					$order->add_order_note( sprintf( __( 'Stripe charge complete (Charge ID: %s)', 'woocommerce-gateway-stripe' ), $result->id ) );
-					WC_Stripe_Helper::is_pre_30() ? update_post_meta( $order_id, '_stripe_charge_captured', 'yes' ) : $order->update_meta_data( '_stripe_charge_captured', 'yes' );
+					$order->add_order_note(sprintf(__('Stripe charge complete (Charge ID: %s)', 'woocommerce-gateway-stripe'), $result->id));
+					WC_Stripe_Helper::is_pre_30() ? update_post_meta($order_id, '_stripe_charge_captured', 'yes') : $order->update_meta_data('_stripe_charge_captured', 'yes');
 
 					// Store other data such as fees
-					WC_Stripe_Helper::is_pre_30() ? update_post_meta( $order_id, '_transaction_id', $result->id ) : $order->set_transaction_id( $result->id );
+					WC_Stripe_Helper::is_pre_30() ? update_post_meta($order_id, '_transaction_id', $result->id) : $order->set_transaction_id($result->id);
 
-					if ( isset( $result->balance_transaction ) && isset( $result->balance_transaction->fee ) ) {
+					if (isset($result->balance_transaction) && isset($result->balance_transaction->fee)) {
 						// Fees and Net needs to both come from Stripe to be accurate as the returned
 						// values are in the local currency of the Stripe account, not from WC.
-						$fee = ! empty( $result->balance_transaction->fee ) ? WC_Stripe_Helper::format_balance_fee( $result->balance_transaction, 'fee' ) : 0;
-						$net = ! empty( $result->balance_transaction->net ) ? WC_Stripe_Helper::format_balance_fee( $result->balance_transaction, 'net' ) : 0;
-						WC_Stripe_Helper::is_pre_30() ? update_post_meta( $order_id, parent::META_NAME_FEE, $fee ) : $order->update_meta_data( parent::META_NAME_FEE, $fee );
-						WC_Stripe_Helper::is_pre_30() ? update_post_meta( $order_id, parent::META_NAME_NET, $net ) : $order->update_meta_data( parent::META_NAME_NET, $net );
+						$fee = ! empty($result->balance_transaction->fee) ? WC_Stripe_Helper::format_balance_fee($result->balance_transaction, 'fee') : 0;
+						$net = ! empty($result->balance_transaction->net) ? WC_Stripe_Helper::format_balance_fee($result->balance_transaction, 'net') : 0;
+						WC_Stripe_Helper::is_pre_30() ? update_post_meta($order_id, parent::META_NAME_FEE, $fee) : $order->update_meta_data(parent::META_NAME_FEE, $fee);
+						WC_Stripe_Helper::is_pre_30() ? update_post_meta($order_id, parent::META_NAME_NET, $net) : $order->update_meta_data(parent::META_NAME_NET, $net);
 					}
 
-					if ( is_callable( array( $order, 'save' ) ) ) {
+					if (is_callable(array($order, 'save'))) {
 						$order->save();
 					}
 				}
 
 				// This hook fires when admin manually changes order status to processing or completed.
-				do_action( 'woocommerce_stripe_process_manual_capture', $order, $result );
+				do_action('woocommerce_stripe_process_manual_capture', $order, $result);
 			}
 		}
 	}
@@ -251,32 +251,32 @@ 
 	 * @version 4.0.0
 	 * @param  int $order_id
 	 */
-	public function cancel_payment( $order_id ) {
-		$order = wc_get_order( $order_id );
+	public function cancel_payment($order_id) {
+		$order = wc_get_order($order_id);
 
-		if ( 'stripe' === ( WC_Stripe_Helper::is_pre_30() ? $order->payment_method : $order->get_payment_method() ) ) {
-			$charge_id = WC_Stripe_Helper::is_pre_30() ? get_post_meta( $order_id, '_transaction_id', true ) : $order->get_transaction_id();
+		if ('stripe' === (WC_Stripe_Helper::is_pre_30() ? $order->payment_method : $order->get_payment_method())) {
+			$charge_id = WC_Stripe_Helper::is_pre_30() ? get_post_meta($order_id, '_transaction_id', true) : $order->get_transaction_id();
 
-			if ( $charge_id ) {
-				$result = WC_Stripe_API::request( array(
-					'amount' => WC_Stripe_Helper::get_stripe_amount( $order->get_total() ),
-				), 'charges/' . $charge_id . '/refund' );
+			if ($charge_id) {
+				$result = WC_Stripe_API::request(array(
+					'amount' => WC_Stripe_Helper::get_stripe_amount($order->get_total()),
+				), 'charges/' . $charge_id . '/refund');
 
-				if ( ! empty( $result->error ) ) {
-					$order->add_order_note( __( 'Unable to refund charge!', 'woocommerce-gateway-stripe' ) . ' ' . $result->error->message );
+				if ( ! empty($result->error)) {
+					$order->add_order_note(__('Unable to refund charge!', 'woocommerce-gateway-stripe') . ' ' . $result->error->message);
 				} else {
 					/* translators: transaction id */
-					$order->add_order_note( sprintf( __( 'Stripe charge refunded (Charge ID: %s)', 'woocommerce-gateway-stripe' ), $result->id ) );
-					WC_Stripe_Helper::is_pre_30() ? delete_post_meta( $order_id, '_stripe_charge_captured' ) : $order->delete_meta_data( '_stripe_charge_captured' );
-					WC_Stripe_Helper::is_pre_30() ? delete_post_meta( $order_id, '_transaction_id' ) : $order->delete_meta_data( '_stripe_transaction_id' );
+					$order->add_order_note(sprintf(__('Stripe charge refunded (Charge ID: %s)', 'woocommerce-gateway-stripe'), $result->id));
+					WC_Stripe_Helper::is_pre_30() ? delete_post_meta($order_id, '_stripe_charge_captured') : $order->delete_meta_data('_stripe_charge_captured');
+					WC_Stripe_Helper::is_pre_30() ? delete_post_meta($order_id, '_transaction_id') : $order->delete_meta_data('_stripe_transaction_id');
 
-					if ( is_callable( array( $order, 'save' ) ) ) {
+					if (is_callable(array($order, 'save'))) {
 						$order->save();
 					}
 				}
 
 				// This hook fires when admin manually changes order status to cancel.
-				do_action( 'woocommerce_stripe_process_manual_cancel', $order, $result );
+				do_action('woocommerce_stripe_process_manual_cancel', $order, $result);
 			}
 		}
 	}
@@ -289,21 +289,21 @@ 
 	 * @param string $field
 	 * @return string $error_field
 	 */
-	public function normalize_field( $field ) {
+	public function normalize_field($field) {
 		$checkout_fields = WC()->checkout->get_checkout_fields();
 		$org_str         = array();
 		$replace_str     = array();
 
-		if ( array_key_exists( $field, $checkout_fields['billing'] ) ) {
-			$error_field = $checkout_fields['billing'][ $field ]['label'];
-		} elseif ( array_key_exists( $field, $checkout_fields['shipping'] ) ) {
-			$error_field = $checkout_fields['shipping'][ $field ]['label'];
-		} elseif ( array_key_exists( $field, $checkout_fields['order'] ) ) {
-			$error_field = $checkout_fields['order'][ $field ]['label'];
-		} elseif ( array_key_exists( $field, $checkout_fields['account'] ) ) {
-			$error_field = $checkout_fields['account'][ $field ]['label'];
+		if (array_key_exists($field, $checkout_fields['billing'])) {
+			$error_field = $checkout_fields['billing'][$field]['label'];
+		} elseif (array_key_exists($field, $checkout_fields['shipping'])) {
+			$error_field = $checkout_fields['shipping'][$field]['label'];
+		} elseif (array_key_exists($field, $checkout_fields['order'])) {
+			$error_field = $checkout_fields['order'][$field]['label'];
+		} elseif (array_key_exists($field, $checkout_fields['account'])) {
+			$error_field = $checkout_fields['account'][$field]['label'];
 		} else {
-			$error_field = str_replace( '_', ' ', $field );
+			$error_field = str_replace('_', ' ', $field);
 
 			$org_str[]     = 'stripe';
 			$replace_str[] = '';
@@ -318,9 +318,9 @@ 
 			$replace_str[] = 'SOFORT';
 
 			$org_str[]     = 'owner';
-			$replace_str[] = __( 'Owner', 'woocommerce-gateway-stripe' );
+			$replace_str[] = __('Owner', 'woocommerce-gateway-stripe');
 
-			$error_field   = str_replace( $org_str, $replace_str, $error_field );
+			$error_field   = str_replace($org_str, $replace_str, $error_field);
 		}
 
 		return $error_field;
@@ -333,154 +333,154 @@ 
 	 * @version 4.0.0
 	 */
 	public function validate_checkout() {
-		if ( ! wp_verify_nonce( $_POST['nonce'], '_wc_stripe_nonce' ) ) {
-			wp_die( __( 'Cheatin&#8217; huh?', 'woocommerce-gateway-stripe' ) );
+		if ( ! wp_verify_nonce($_POST['nonce'], '_wc_stripe_nonce')) {
+			wp_die(__('Cheatin&#8217; huh?', 'woocommerce-gateway-stripe'));
 		}
 
 		$errors = new WP_Error();
-		parse_str( $_POST['required_fields'], $required_fields );
-		parse_str( $_POST['all_fields'], $all_fields );
-		$source_type = isset( $_POST['source_type'] ) ? wc_clean( $_POST['source_type'] ) : '';
+		parse_str($_POST['required_fields'], $required_fields);
+		parse_str($_POST['all_fields'], $all_fields);
+		$source_type = isset($_POST['source_type']) ? wc_clean($_POST['source_type']) : '';
 		$validate_shipping_fields = false;
 		$create_account = false;
 
-		array_walk_recursive( $required_fields, 'wc_clean' );
-		array_walk_recursive( $all_fields, 'wc_clean' );
+		array_walk_recursive($required_fields, 'wc_clean');
+		array_walk_recursive($all_fields, 'wc_clean');
 
 		// Remove unneeded required fields depending on source type.
-		if ( 'stripe_sepa' !== $source_type ) {
-			unset( $required_fields['stripe_sepa_owner'] );
-			unset( $required_fields['stripe_sepa_iban'] );
+		if ('stripe_sepa' !== $source_type) {
+			unset($required_fields['stripe_sepa_owner']);
+			unset($required_fields['stripe_sepa_iban']);
 		}
 
-		if ( 'stripe_sofort' !== $source_type ) {
-			unset( $required_fields['stripe_sofort_bank_country'] );
+		if ('stripe_sofort' !== $source_type) {
+			unset($required_fields['stripe_sofort_bank_country']);
 		}
 
 		/**
 		 * If ship to different address checkbox is checked then we need
 		 * to validate shipping fields too.
 		 */
-		if ( isset( $all_fields['ship_to_different_address'] ) ) {
+		if (isset($all_fields['ship_to_different_address'])) {
 			$validate_shipping_fields = true;
 		}
 
 		// Check if createaccount is checked.
-		if ( isset( $all_fields['createaccount'] ) ) {
+		if (isset($all_fields['createaccount'])) {
 			$create_account = true;
 		}
 
 		// Check if required fields are empty.
-		foreach ( $required_fields as $field => $field_value ) {
+		foreach ($required_fields as $field => $field_value) {
 			// Check for shipping field.
-			if ( preg_match( '/^shipping_/', $field ) && ! $validate_shipping_fields ) {
+			if (preg_match('/^shipping_/', $field) && ! $validate_shipping_fields) {
 				continue;
 			}
 
 			// Check create account name.
-			if ( 'account_username' === $field && ! $create_account ) {
+			if ('account_username' === $field && ! $create_account) {
 				continue;
 			}
 
 			// Check create account password.
-			if ( 'account_password' === $field && ! $create_account ) {
+			if ('account_password' === $field && ! $create_account) {
 				continue;
 			}
 
 			// Check if is SEPA.
-			if ( 'stripe_sepa' !== $source_type && 'stripe_sepa_owner' === $field ) {
+			if ('stripe_sepa' !== $source_type && 'stripe_sepa_owner' === $field) {
 				continue;
 			}
 
-			if ( 'stripe_sepa' !== $source_type && 'stripe_sepa_iban' === $field ) {
+			if ('stripe_sepa' !== $source_type && 'stripe_sepa_iban' === $field) {
 				$continue;
 			}
 
-			if ( empty( $field_value ) || '-1' === $field_value ) {
-				$error_field = $this->normalize_field( $field );
+			if (empty($field_value) || '-1' === $field_value) {
+				$error_field = $this->normalize_field($field);
 				/* translators: error field name */
-				$errors->add( 'validation', sprintf( __( '%s cannot be empty', 'woocommerce-gateway-stripe' ), $error_field ) );
+				$errors->add('validation', sprintf(__('%s cannot be empty', 'woocommerce-gateway-stripe'), $error_field));
 			}
 		}
 
 		// Check if email is valid format.
-		if ( ! empty( $required_fields['billing_email'] ) && ! is_email( $required_fields['billing_email'] ) ) {
-			$errors->add( 'validation', __( 'Email is not valid', 'woocommerce-gateway-stripe' ) );
+		if ( ! empty($required_fields['billing_email']) && ! is_email($required_fields['billing_email'])) {
+			$errors->add('validation', __('Email is not valid', 'woocommerce-gateway-stripe'));
 		}
 
 		// Check if phone number is valid format.
-		if ( ! empty( $required_fields['billing_phone'] ) ) {
-			$phone = wc_format_phone_number( $required_fields['billing_phone'] );
+		if ( ! empty($required_fields['billing_phone'])) {
+			$phone = wc_format_phone_number($required_fields['billing_phone']);
 
-			if ( '' !== $phone && ! WC_Validation::is_phone( $phone ) ) {
+			if ('' !== $phone && ! WC_Validation::is_phone($phone)) {
 				/* translators: %s: phone number */
-				$errors->add( 'validation', __( 'Please enter a valid phone number.', 'woocommerce-gateway-stripe' ) );
+				$errors->add('validation', __('Please enter a valid phone number.', 'woocommerce-gateway-stripe'));
 			}
 		}
 
 		// Check if postal code is valid format.
-		if ( ! empty( $required_fields['billing_postcode'] ) ) {
-			$country = isset( $required_fields['billing_country'] ) ? $required_fields['billing_country'] : WC()->customer->get_billing_country();
-			$postcode = wc_format_postcode( $required_fields['billing_postcode'], $country );
+		if ( ! empty($required_fields['billing_postcode'])) {
+			$country = isset($required_fields['billing_country']) ? $required_fields['billing_country'] : WC()->customer->get_billing_country();
+			$postcode = wc_format_postcode($required_fields['billing_postcode'], $country);
 
-			if ( '' !== $required_fields['billing_postcode'] && ! WC_Validation::is_postcode( $postcode, $country ) ) {
-				$errors->add( 'validation', __( 'Please enter a valid billing postcode / ZIP.', 'woocommerce-gateway-stripe' ) );
+			if ('' !== $required_fields['billing_postcode'] && ! WC_Validation::is_postcode($postcode, $country)) {
+				$errors->add('validation', __('Please enter a valid billing postcode / ZIP.', 'woocommerce-gateway-stripe'));
 			}
 		}
 
 		// Don't check this on add payment method page.
-		if ( ( isset( $_POST['is_add_payment_page'] ) && 'no' === $_POST['is_add_payment_page'] ) ) {
-			if ( empty( $all_fields['woocommerce_checkout_update_totals'] ) && empty( $all_fields['terms'] ) && apply_filters( 'woocommerce_checkout_show_terms', wc_get_page_id( 'terms' ) > 0 ) ) {
-				$errors->add( 'terms', __( 'You must accept our Terms &amp; Conditions.', 'woocommerce-gateway-stripe' ) );
+		if ((isset($_POST['is_add_payment_page']) && 'no' === $_POST['is_add_payment_page'])) {
+			if (empty($all_fields['woocommerce_checkout_update_totals']) && empty($all_fields['terms']) && apply_filters('woocommerce_checkout_show_terms', wc_get_page_id('terms') > 0)) {
+				$errors->add('terms', __('You must accept our Terms &amp; Conditions.', 'woocommerce-gateway-stripe'));
 			}
 		}
 
-		if ( WC()->cart->needs_shipping() && $validate_shipping_fields ) {
+		if (WC()->cart->needs_shipping() && $validate_shipping_fields) {
 			// Check if postal code is valid format.
-			if ( ! empty( $required_fields['shipping_postcode'] ) ) {
-				$country = isset( $required_fields['shipping_country'] ) ? $required_fields['shipping_country'] : WC()->customer->get_shipping_country();
-				$postcode = wc_format_postcode( $required_fields['shipping_postcode'], $country );
+			if ( ! empty($required_fields['shipping_postcode'])) {
+				$country = isset($required_fields['shipping_country']) ? $required_fields['shipping_country'] : WC()->customer->get_shipping_country();
+				$postcode = wc_format_postcode($required_fields['shipping_postcode'], $country);
 
-				if ( '' !== $required_fields['shipping_postcode'] && ! WC_Validation::is_postcode( $postcode, $country ) ) {
-					$errors->add( 'validation', __( 'Please enter a valid shipping postcode / ZIP.', 'woocommerce-gateway-stripe' ) );
+				if ('' !== $required_fields['shipping_postcode'] && ! WC_Validation::is_postcode($postcode, $country)) {
+					$errors->add('validation', __('Please enter a valid shipping postcode / ZIP.', 'woocommerce-gateway-stripe'));
 				}
 			}
 		}
 
-		if ( WC()->cart->needs_shipping() ) {
+		if (WC()->cart->needs_shipping()) {
 			$shipping_country = WC()->customer->get_shipping_country();
 
-			if ( empty( $shipping_country ) ) {
-				$errors->add( 'shipping', __( 'Please enter an address to continue.', 'woocommerce-gateway-stripe' ) );
-			} elseif ( ! in_array( WC()->customer->get_shipping_country(), array_keys( WC()->countries->get_shipping_countries() ) ) ) {
+			if (empty($shipping_country)) {
+				$errors->add('shipping', __('Please enter an address to continue.', 'woocommerce-gateway-stripe'));
+			} elseif ( ! in_array(WC()->customer->get_shipping_country(), array_keys(WC()->countries->get_shipping_countries()))) {
 				/* translators: country name */
-				$errors->add( 'shipping', sprintf( __( 'Unfortunately <strong>we do not ship %s</strong>. Please enter an alternative shipping address.', 'woocommerce-gateway-stripe' ), WC()->countries->shipping_to_prefix() . ' ' . WC()->customer->get_shipping_country() ) );
+				$errors->add('shipping', sprintf(__('Unfortunately <strong>we do not ship %s</strong>. Please enter an alternative shipping address.', 'woocommerce-gateway-stripe'), WC()->countries->shipping_to_prefix() . ' ' . WC()->customer->get_shipping_country()));
 			} else {
-				$chosen_shipping_methods = WC()->session->get( 'chosen_shipping_methods' );
+				$chosen_shipping_methods = WC()->session->get('chosen_shipping_methods');
 
-				foreach ( WC()->shipping->get_packages() as $i => $package ) {
-					if ( ! isset( $chosen_shipping_methods[ $i ], $package['rates'][ $chosen_shipping_methods[ $i ] ] ) ) {
-						$errors->add( 'shipping', __( 'No shipping method has been selected. Please double check your address, or contact us if you need any help.', 'woocommerce-gateway-stripe' ) );
+				foreach (WC()->shipping->get_packages() as $i => $package) {
+					if ( ! isset($chosen_shipping_methods[$i], $package['rates'][$chosen_shipping_methods[$i]])) {
+						$errors->add('shipping', __('No shipping method has been selected. Please double check your address, or contact us if you need any help.', 'woocommerce-gateway-stripe'));
 					}
 				}
 			}
 		}
 
-		if ( WC()->cart->needs_payment() ) {
+		if (WC()->cart->needs_payment()) {
 			$available_gateways = WC()->payment_gateways->get_available_payment_gateways();
 
-			if ( ! isset( $available_gateways[ $all_fields['payment_method'] ] ) ) {
-				$errors->add( 'payment', __( 'Invalid payment method.', 'woocommerce-gateway-stripe' ) );
+			if ( ! isset($available_gateways[$all_fields['payment_method']])) {
+				$errors->add('payment', __('Invalid payment method.', 'woocommerce-gateway-stripe'));
 			} else {
-				$available_gateways[ $all_fields['payment_method'] ]->validate_fields();
+				$available_gateways[$all_fields['payment_method']]->validate_fields();
 			}
 		}
 
-		if ( 0 === count( $errors->errors ) ) {
-			wp_send_json( 'success' );
+		if (0 === count($errors->errors)) {
+			wp_send_json('success');
 		} else {
-			foreach ( $errors->get_error_messages() as $message ) {
-				wc_add_notice( $message, 'error' );
+			foreach ($errors->get_error_messages() as $message) {
+				wc_add_notice($message, 'error');
 			}
 
 			$this->send_ajax_failure_response();
@@ -494,9 +494,9 @@ 
 	 * @version 4.0.0
 	 */
 	public function send_ajax_failure_response() {
-		if ( is_ajax() ) {
+		if (is_ajax()) {
 			// only print notices if not reloading the checkout, otherwise they're lost in the page reload.
-			if ( ! isset( WC()->session->reload_checkout ) ) {
+			if ( ! isset(WC()->session->reload_checkout)) {
 				ob_start();
 				wc_print_notices();
 				$messages = ob_get_clean();
@@ -504,14 +504,14 @@ 
 
 			$response = array(
 				'result'   => 'failure',
-				'messages' => isset( $messages ) ? $messages : '',
-				'refresh'  => isset( WC()->session->refresh_totals ),
-				'reload'   => isset( WC()->session->reload_checkout ),
+				'messages' => isset($messages) ? $messages : '',
+				'refresh'  => isset(WC()->session->refresh_totals),
+				'reload'   => isset(WC()->session->reload_checkout),
 			);
 
-			unset( WC()->session->refresh_totals, WC()->session->reload_checkout );
+			unset(WC()->session->refresh_totals, WC()->session->reload_checkout);
 
-			wp_send_json( $response );
+			wp_send_json($response);
 		}
 	}
 }