Every payment method has their workflow. So they also must implement their own notification.
For example manual payment, the editor must confirm manually the submission payment that author pay. So when author is providing a proof of payment, the editor must be informed so they can check. Also when editor is confirming the payment, the author will receive the notification.
Every payment method has their workflow. So they also must implement their own notification. For example manual payment, the editor must confirm manually the submission payment that author pay. So when author is providing a proof of payment, the editor must be informed so they can check. Also when editor is confirming the payment, the author will receive the notification.