Fatal error: Uncaught Error: Class "Braintree\Instance" not found in C:\AppServ\www\greenhess-storage\vendor\braintree\braintree_php\lib\Braintree\Transaction\AmexExpressCheckoutCardDetails.php:31 Stack trace: #0 {main} thrown in C:\AppServ\www\greenhess-storage\vendor\braintree\braintree_php\lib\Braintree\Transaction\AmexExpressCheckoutCardDetails.php on line 31