Fatal error: Uncaught Error: Class 'PayPal\Common\PayPalModel' not found in /var/www/microservices/vendor/paypal/rest-api-sdk-php/lib/PayPal/Api/Notification.php:19 Stack trace: #0 {main} thrown in /var/www/microservices/vendor/paypal/rest-api-sdk-php/lib/PayPal/Api/Notification.php on line 19