Hello,
While 2checkoout module works great, there's one problem. If transaction fails fraud check, invoice is still marked as paid, got caught on this yesterday. Set up a service, everything looked good. Went to 2checkout user panel for something unrelated and by happy accident noticed that transaction failed fraud check and thus was not accepted by 2co. I never thought about it, since I am coming from "the other" product and it only set invoice to paid after fraud was passed (so this is definitely doable). Hope this can be supported in the future.
Otherwise thanks for the great product!
Edit: This is the appropriate bit I guess: https://www.2checkout.com/documentation/notifications