Strange
I'm in my 2CheckOut admin area and seeing something about Authorize.NET. I can use 2CheckOut in the same way as I would Authorize.NET - get a SSL cert and take the order from my site, passing the info on to 2CheckOut... Is this correct or am I missiong something? Also my billing program wants a user+pass for Authorize.NET intergration, what would this be? I know I need to edit my billing program to make this work to edit the Authorize.NET URL it has to the 2CheckOut version. Can anyone tell me if I'm getting this right?
Thanks

If I am not wrong, the final page needs to be on 2checkout.com in order to process. Even you have a way to get around with this, the IP address will always be the same - your server IP, not the client's IP anymore.

I have contacted support for both 2CheckOut and PerlBill on this one :) But what I do know is that it will be the client IP since PerlBill picks it up and is listed one of the things it sends to Authorize.NET (or in this case 2CheckOut:D)

Thanks