Fatal error: Uncaught Error: Class 'Braintree_Exception' not found in /var/www/html/www.ecsprepaidportal.com/braintree/lib/Braintree/Exception/InvalidSignature.php:2 Stack trace: #0 {main} thrown in /var/www/html/www.ecsprepaidportal.com/braintree/lib/Braintree/Exception/InvalidSignature.php on line 2