Fatal error: Uncaught InvalidArgumentException: ReturnUrl is not a fully qualified URL in C:\laragon\www\4TresSro-PVE old style\vendor\paypal\rest-api-sdk-php\lib\PayPal\Validation\UrlValidator.php:23 Stack trace: #0 C:\laragon\www\4TresSro-PVE old style\vendor\paypal\rest-api-sdk-php\lib\PayPal\Api\MerchantPreferences.php(107): PayPal\Validation\UrlValidator::validate('http://157.90.1...', 'ReturnUrl') #1 C:\laragon\www\4TresSro-PVE old style\vendor\paypal\rest-api-sdk-php\sample\billing\CreatePlan.php(50): PayPal\Api\MerchantPreferences->setReturnUrl('http://157.90.1...') #2 C:\laragon\www\4TresSro-PVE old style\vendor\paypal\rest-api-sdk-php\sample\billing\UpdatePlan.php(14): require('C:\\laragon\\www\\...') #3 C:\laragon\www\4TresSro-PVE old style\vendor\paypal\rest-api-sdk-php\sample\billing\CreateBillingAgreementWithCreditCard.php(12): require('C:\\laragon\\www\\...') #4 {main} thrown in C:\laragon\www\4TresSro-PVE old style\vendor\paypal\rest-api-sdk-php\lib\PayPal\Validation\UrlValidator.php on line 23