So, I'm looking at 2CO's website, and I'm trying to figure out how their callbacks work. Is anyone doing recurring payments with 2CO? Do they notify you via some sort of callback when a recurring payment (not the initial subscription payment) is made? From their documentation it would appear that they only provide a notification via the configurable return page that they redirect the user to after payment. This would not help, however, with additional payments made on a recurring basis. Any idea? Is there better documentation out there?