Fatal error: Uncaught Error: Class "DarthSoup\WhmcsApi\Api\AbstractApi" not found in /home/daroomokamel/public_html/whmcs_api_wraper/vendor/darthsoup/php-whmcs-api/src/Api/Billing.php:7 Stack trace: #0 {main} thrown in /home/daroomokamel/public_html/whmcs_api_wraper/vendor/darthsoup/php-whmcs-api/src/Api/Billing.php on line 7