After the booking (and sending the webhook to notify of payment success) the booker can be returned to the page booking.php?page=bookconfirmed which will show the booking they just made.
The booking is a stored in a session variable, which means that the confirmation page needs to be on the same domain as the booking otherwise it wont work or if it's in incognito mode and might time out after 15 minutes.
= Webhook to notify of payment status =