Fatal error: Uncaught Error: Class 'Vonage\Client\Callback\Callback' not found in /home/digitalproduct/public_html/onlinejobportal/vendor/vonage/client-core/src/Message/Callback/Receipt.php:20 Stack trace: #0 {main} thrown in /home/digitalproduct/public_html/onlinejobportal/vendor/vonage/client-core/src/Message/Callback/Receipt.php on line 20