Fatal error: Uncaught Error: Call to a member function getId() on string in /mnt/VenusReview/review/lyrasoft/dva/master/vendor/paypal/rest-api-sdk-php/sample/billing/GetBillingAgreement.php:17 Stack trace: #0 {main} thrown in /mnt/VenusReview/review/lyrasoft/dva/master/vendor/paypal/rest-api-sdk-php/sample/billing/GetBillingAgreement.php on line 17