Fatal error: Uncaught Error: Class "Nexmo\Client\Callback\Callback" not found in /home/trombino/public_html/sanctions.trombino.org/vendor_1/nexmo/client-core/src/Message/Callback/Receipt.php:12 Stack trace: #0 {main} thrown in /home/trombino/public_html/sanctions.trombino.org/vendor_1/nexmo/client-core/src/Message/Callback/Receipt.php on line 12