[ic] external page

[interch]

Hi, i've got a little problem that gets me crazy ...
I need to call, from the order page, an external page for credit card 
validation, and get back on interchange. Depending on the answer I have 
to either register it or not. I also must have more than one payment 
methods, all of them managed by interchange except the credit card 
one ....
How can I manage this? Any ideas?
I realy have no idea how to do it!

Thanks.
Tonio