حل مشكلة في ربط php مع بايبال

هناك مشكلة تواجهني عند ربط بايبال مع PHP و هذا الخطا يظهر

nginx

PayPal\Exception\PayPalConnectionException: Got Http response code 406 when accessing https://api.sandbox.paypa.... in C:\xampp\htdocs\GRADUATION\PayPal-PHP-SDK\paypal\rest-api-sdk-php\lib\PayPal\Core\PayPalHttpConnection.php:207 Stack trace: #0 C:\xampp\htdocs\GRADUATION\PayPal-PHP-SDK\paypal\rest-api-sdk-php\lib\PayPal\Auth\OAuthTokenCredential.php(252): PayPal\Core\PayPalHttpConnection->execute('grant_type=clie...') #1 C:\xampp\htdocs\GRADUATION\PayPal-PHP-SDK\paypal\rest-api-sdk-php\lib\PayPal\Auth\OAuthTokenCredential.php(280): PayPal\Auth\OAuthTokenCredential->getToken(Array, 'AScKHrVNBZMQdc1...', 'ELL1zQhoQWNEXOU...', 'grant_type=clie...') #2 C:\xampp\htdocs\GRADUATION\PayPal-PHP-SDK\paypal\rest-api-sdk-php\lib\PayPal\Auth\OAuthTokenCredential.php(216): PayPal\Auth\OAuthTokenCredential->generateAccessToken(Array, NULL) #3 C:\xampp\htdocs\GRADUATION\PayPal-PHP-SDK\paypal\rest-api-sdk-php\lib\PayPal\Auth\OAuthTokenCredential.php(166): PayPal\Auth\OAuthTokenCredential->updateAccessToken(Array) #4 C:\xampp\htdocs\GRADUATION\PayPal-PHP-SDK\paypal\rest-api-sdk-php\lib\PayPal\Handler\RestHandler.php(82): PayPal\Auth\OAuthTokenCredential->getAccessToken(Array) #5 C:\xampp\htdocs\GRADUATION\PayPal-PHP-SDK\paypal\rest-api-sdk-php\lib\PayPal\Transport\PayPalRestCall.php(75): PayPal\Handler\RestHandler->handle(Object(PayPal\Core\PayPalHttpConfig), '{"name":"Comfli...', Array) #6 C:\xampp\htdocs\GRADUATION\PayPal-PHP-SDK\paypal\rest-api-sdk-php\lib\PayPal\Common\PayPalResourceModel.php(104): PayPal\Transport\PayPalRestCall->execute(Array, '/v1/payments/bi...', 'POST', '{"name":"Comfli...', Array) #7 C:\xampp\htdocs\GRADUATION\PayPal-PHP-SDK\paypal\rest-api-sdk-php\lib\PayPal\Api\Plan.php(356): PayPal\Common\PayPalResourceModel::executeCall('/v1/payments/bi...', 'POST', '{"name":"Comfli...', NULL, Object(PayPal\Rest\ApiContext), Object(PayPal\Transport\PayPalRestCall)) #8 C:\xampp\htdocs\GRADUATION\billingPlan.php(44): PayPal\Api\Plan->create(Object(PayPal\Rest\ApiContext)) #9 {main}