Fatal error: Uncaught Error: Class "Braintree\Base" not found in C:\xampp\htdocs\public\vendor\braintree\braintree_php\lib\Braintree\PartnerMerchant.php:17 Stack trace: #0 {main} thrown in C:\xampp\htdocs\public\vendor\braintree\braintree_php\lib\Braintree\PartnerMerchant.php on line 17