In payment_callback.php, XenForo_UserUpgradeProcessor_PayPal is directly created rather than going through the XenForo_Application::resolveDynamicClass or using a trampoline method like CssOutput::run()
This is required if you want to change how the paypal processor reacts to events, without using webserver redirection trips to a new copy of payment_callback.php.
This is required if you want to change how the paypal processor reacts to events, without using webserver redirection trips to a new copy of payment_callback.php.