Fatal error: Uncaught Error: Class 'OxidEsales\PayPalModule\Controller\FrontendController' not found in /www/shop/vendor/oxid-esales/paypal-module/Controller/IPNHandler.php:31 Stack trace: #0 {main} thrown in /www/shop/vendor/oxid-esales/paypal-module/Controller/IPNHandler.php on line 31