Fatal error: Uncaught Error: Interface "PayPal\Handler\IPayPalHandler" not found in /var/www/html/ohnishi-test.site/PayPal-PHP-SDK-master/lib/PayPal/Handler/RestHandler.php:20
Stack trace:
#0 {main}
thrown in /var/www/html/ohnishi-test.site/PayPal-PHP-SDK-master/lib/PayPal/Handler/RestHandler.php on line 20