Fatal error: Uncaught Error: Call to a member function suspend() on null in /home/thewpked/public_html/demos/khalid_bcu/vendor/paypal/rest-api-sdk-php/sample/billing/SuspendBillingAgreement.php:24 Stack trace: #0 {main} thrown in /home/thewpked/public_html/demos/khalid_bcu/vendor/paypal/rest-api-sdk-php/sample/billing/SuspendBillingAgreement.php on line 24