I'm trying to set up Foxycart to work for a client who has Chase Paymentech. (I emailed Maurci Witherspoon, listed in the wiki as being the Chase Paymentech Foxycart expert, but I never got a response - I'll try calling her tomorrow).
After setting it up and trying to do a test order, I'm getting a response error HTTP status code of 412, which, according to the Chase documentation, means the IP address that is connecting with them hasn't been registered. I called up the general support line there, and learned that yes, I do need to register it with them. But, I have to assume this isn't MY IP address that needs to be registered, since it would be over on the checkout and your servers when it communicates with them, yes? So where would I get this IP address from?