Fatal error: Uncaught Error: Call to a member function getId() on string in /home/thewpked/public_html/demos/khalid_bcu/vendor/paypal/rest-api-sdk-php/sample/billing/GetBillingAgreement.php:17 Stack trace: #0 {main} thrown in /home/thewpked/public_html/demos/khalid_bcu/vendor/paypal/rest-api-sdk-php/sample/billing/GetBillingAgreement.php on line 17