Fatal error: Uncaught Error: Class "PayPal\Common\PayPalModel" not found in /var/www/html/ohnishi-test.site/PayPal-PHP-SDK-master/lib/PayPal/Api/BillingInfo.php:24 Stack trace: #0 {main} thrown in /var/www/html/ohnishi-test.site/PayPal-PHP-SDK-master/lib/PayPal/Api/BillingInfo.php on line 24