Use correct production or sandbox URL based on configuration mode.

src/Config.php

@@ -47,6 +47,34 @@ public function get_email() {
 		return $this->email;
 	}
 
+	/**
+	 * Get the `webscr` URL.
+	 * 
+	 * @link https://developer.paypal.com/docs/paypal-payments-standard/integration-guide/formbasics/
+	 * @return string
+	 */
+	public function get_webscr_url() {
+		if ( 'test' === $this->mode ) {
+			return 'https://www.sandbox.paypal.com/cgi-bin/webscr';
+		}
+
+		return 'https://www.paypal.com/cgi-bin/webscr';
+	}
+
+	/**
+	 * Get the IPN post back URL.
+	 * 
+	 * @link https://developer.paypal.com/docs/api-basics/notifications/ipn/IPNImplementation/#specs
+	 * @return string
+	 */
+	public function get_ipn_pb_url() {
+		if ( 'test' === $this->mode ) {
+			return 'https://ipnpb.sandbox.paypal.com/cgi-bin/webscr';
+		}
+
+		return 'https://ipnpb.paypal.com/cgi-bin/webscr';
+	}
+
 	/**
 	 * JSON serialize.
 	 *

src/Gateway.php

@@ -85,7 +85,7 @@ public function start( Payment $payment ) {
 		 * @link https://developer.paypal.com/docs/paypal-payments-standard/integration-guide/Appx-websitestandard-htmlvariables/
 		 * @link https://github.com/easydigitaldownloads/easy-digital-downloads/blob/2.9.26/includes/gateways/paypal-standard.php
 		 */
-		$url = 'https://www.sandbox.paypal.com/cgi-bin/webscr';
+		$url = $this->config->get_webscr_url();
 
 		$variables = new Variables();
 

src/Integration.php

@@ -65,7 +65,7 @@ public function setup() {
 		);
 
 		// Notifications controller.
-		$notifications_controller = new NotificationsController();
+		$notifications_controller = new NotificationsController( $this );
 
 		$notifications_controller->setup();
 	}

src/NotificationsController.php

@@ -24,6 +24,15 @@
  * @since 1.0.0
  */
 class NotificationsController {
+	/**
+	 * Construct notifications controller.
+	 * 
+	 * @param Integration $integration Integration.
+	 */
+	public function __construct( $integration ) {
+		$this->integration = $integration;
+	}
+
 	/**
 	 * Setup.
 	 *
@@ -120,13 +129,15 @@ public function rest_api_paypal_ipn( WP_REST_Request $request ) {
 			);
 		}
 
+		$config = $this->integration->get_config( $payment->config_id );
+
 		/**
 		 * Instant Payment Notification Post Back URL.
 		 * 
 		 * @link https://developer.paypal.com/docs/api-basics/notifications/ipn/ht-ipn/
 		 * @link https://developer.paypal.com/docs/api-basics/notifications/ipn/IPNImplementation/#specs
 		 */
-		$ipn_pb_url = 'https://ipnpb.sandbox.paypal.com/cgi-bin/webscr';
+		$ipn_pb_url = $config->get_ipn_pb_url();
 
 		/**
 		 * Prefix the returned message with the `cmd=_notify-validate` variable,

tests/src/IntegrationTest.php

@@ -50,7 +50,7 @@ public function test_config_post() {
 		$post_id = $this->factory->post->create();
 
 		\update_post_meta( $post_id, '_pronamic_gateway_mode', Gateway::MODE_TEST );
-		\update_post_meta( $post_id, '_pronamic_gateway_email', 'info@pronamic.nl' );
+		\update_post_meta( $post_id, '_pronamic_gateway_paypal_email', 'info@pronamic.nl' );
 
 		$config = $this->integration->get_config( $post_id );