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