I'm integrating Easy Appointments into my existing website that already has a custom-built payment system. This system can redirect a user to a custom URL after successful payment. Is there a way to implement the following?

1. The user makes a reservation (pending) and is redirected to the payment page.
2. The user pays for the reservation and the payment system redirects him to some Easy Appointments URL
3. The reservation changes status from "pending" to "confirmed" automatically.