It's working.

For future reference, when your client says they have a Merchant Account with Nochex, make sure:

1. They actually have it and not just applied for it
2. They have registered a Bank Account AND a Credit Card
3. They have finished the authorisation process by entering the payments from Nochex.



If any of these aren't done, the account seems to act as a Seller account and nothing gets passed back to the shop.

I am now going to have a stiff drink.