Fatal error: Uncaught Error: Class "PayPal\Common\PayPalModel" not found in /var/www/html/ohnishi-test.site/PayPal-PHP-SDK-master_v2/lib/PayPal/Api/InstallmentInfo.php:19 Stack trace: #0 {main} thrown in /var/www/html/ohnishi-test.site/PayPal-PHP-SDK-master_v2/lib/PayPal/Api/InstallmentInfo.php on line 19