This page shows two different code samples for the same hook:
http://www.gravityhelp.com/documentation/page/Gform_post_payment_status
1. add_filter ("gform_paypal_post_payment_status", "admin_notify_status", 10, 8);
2. add_action ('gform_post_payment_status', 'admin_payment_notification');
Which one is correct?
Gleb