register errorpayment url and create new function to decode response (#…

…42)

includes/class-mmg-checkout-payment-activator.php

@@ -56,6 +56,11 @@ private static function add_rewrite_rules() {
 			'index.php?mmg-checkout=1&callback_key=$matches[1]',
 			'top'
 		);
+		add_rewrite_rule(
+			'^wc-api/mmg-checkout/([^/]+)/errorpayment/?$',
+			'index.php?mmg-checkout=errorpayment&callback_key=$matches[1]',
+			'top'
+		);
 		add_rewrite_tag( '%mmg-checkout%', '([^&]+)' );
 	}
 }

includes/class-mmg-checkout-payment.php

@@ -361,11 +361,51 @@ private function url_safe_base64_decode( $data ) {
 	public function parse_api_request() {
 		global $wp;
 		if ( isset( $wp->query_vars['mmg-checkout'] ) ) {
-			$this->handle_payment_confirmation();
+			$path_info = isset( $_SERVER['PATH_INFO'] ) ? sanitize_text_field( wp_unslash( $_SERVER['PATH_INFO'] ) ) : '';
+			if ( strpos( $path_info, '/errorpayment' ) !== false ) {
+				$this->handle_error_payment();
+			} else {
+				$this->handle_payment_confirmation();
+			}
 			exit;
 		}
 	}
 
+	/**
+	 * Handle error payment.
+	 */
+	public function handle_error_payment() {
+		$token = isset( $_GET['token'] ) ? sanitize_text_field( wp_unslash( $_GET['token'] ) ) : '';
+
+		if ( empty( $token ) ) {
+			wp_die( 'Invalid token', 'MMG Checkout Error', array( 'response' => 400 ) );
+		}
+
+		try {
+			$decoded_token = $this->url_safe_base64_decode( $token );
+			$error_data    = $this->decrypt( $decoded_token );
+		} catch ( Exception $e ) {
+			wp_die( 'Error decrypting token: ' . esc_html( $e->getMessage() ), 'MMG Checkout Error', array( 'response' => 400 ) );
+		}
+
+		$order_id      = isset( $error_data['merchantTransactionId'] ) ? intval( $error_data['merchantTransactionId'] ) : 0;
+		$error_code    = isset( $error_data['errorCode'] ) ? intval( $error_data['errorCode'] ) : null;
+		$error_message = isset( $error_data['errorMessage'] ) ? sanitize_text_field( $error_data['errorMessage'] ) : '';
+
+		$order = wc_get_order( $order_id );
+
+		if ( ! $order ) {
+			wp_die( 'Invalid order', 'MMG Checkout Error', array( 'response' => 400 ) );
+		}
+
+		$order->update_status( 'failed', "Payment failed. Error Code: {$error_code}, Message: {$error_message}" );
+
+		// Redirect to the order page with an error message.
+		wc_add_notice( __( 'Payment failed. Please try again or contact support.', 'mmg-checkout' ), 'error' );
+		wp_safe_redirect( $order->get_checkout_payment_url() );
+		exit;
+	}
+
 	/**
 	 * Handle payment confirmation.
 	 */