I have a hosted web site built on Rails 2.3.14 and Ruby 1.8.7. In order to capture shipping info so I can compute shipping charge, I provide the form for shipping address and then use a credit card processor just to handle the actual credit card entry and authorization. PayPal's Payments Advanced does exactly what I want. I'd really like to use the activemerchant gem but I cannot find information on which specific gateway to use or how. There is an active_merchant discussion on github that says "This is almost an carbon copy of Payflow Link", but I cannot manage to convert that to a useful example, since every example I find passes CC info. Can anyone point to or provide an example of this usage of activemerchant?
-Russ