I've worked on too many payment mods to remember the specifics of this one, but the documentation was quite good. It's the way it works that's rather dated. On the transaction acceptance, it's possible that that specific transaction amount also needs to be used with a Barclays supplied test card number.
I made that mistake too, egged on by a client who was adamant that she wanted ePDQ (she's now reversed that position and is going Protx).




