VFP, Authorize.net

A friend of mine sent the following question, and I don't know the answer. Does anyone know off the top of their head?

"I have a VFP question if you do not mind. I have a client with an old custom app in VFP 7 and 9. They process credit cards using Authorize.net. Authorize.net is pushing everyone to a new API and I am tasked with migrating the client’s apps so they can use this new API (https://developer.authorize.net/api/reference/index.html). Currently they use HTTP Posts to send in the CC info.

Anyway, my question is this. Authorize offers a development kit and example code using C#. Therefore it should be .Net compliant and wouldn’t that mean I could use the same in a VFP application?"