Fatal error: Uncaught Error: Class "PayPal\Api\TransactionBase" not found in /home2/cp334332/public_html/examcenter/vendor/paypal/rest-api-sdk-php/lib/PayPal/Api/Transaction.php:13 Stack trace: #0 {main} thrown in /home2/cp334332/public_html/examcenter/vendor/paypal/rest-api-sdk-php/lib/PayPal/Api/Transaction.php on line 13