Fatal error: Uncaught Error: Class 'PayPal\Api\TransactionBase' not found in /home/ultraunlock/public_html/PayPal-PHP-SDK/lib/PayPal/Api/Transaction.php:13 Stack trace: #0 {main} thrown in /home/ultraunlock/public_html/PayPal-PHP-SDK/lib/PayPal/Api/Transaction.php on line 13