Fatal error: Uncaught Error: Class "Braintree\Collection" not found in /var/www/develop/www/php/vendor/braintree/braintree_php/lib/Braintree/Error/ValidationErrorCollection.php:19 Stack trace: #0 {main} thrown in /var/www/develop/www/php/vendor/braintree/braintree_php/lib/Braintree/Error/ValidationErrorCollection.php on line 19