Multi Merchant Accounts

hello, I am facing the following problem. I would like to process credit cards in both canadian and us dollars. I have merchant accounts for each currency. As far as I understand, the payment info submission is handled by "before_process()" function for each credit card modules. Right before the function is called, I need to check what currency and credit card type (Visa, MC) are used to pass appropriate merchant credentials.

I would really appreciate if someone point me to the place where the function is called and how to write this If..Then block in PHP.

thank you in advance!

Oh, and I am using Zen Cart v1.3.9e. I would appreciate any help.

Help...anyone...please? It seems like a trivial issue for Zen Cart gurus...

There is code in the beanstream and paymentech addon modules that does that sort of thing. Perhaps you can find inspiration from that to suit your needs with your own site.