Orders from my stationery site can only be processed through Paypal right now (see http://papersparkle.com/Card%20Views/BBQ_A.html ). This works well, and I can integrate the paypal code right into my site, while keeping it looking the way I want it. But I recently opened a merchant account to accept all cc's and now I want my site to interface with my merchant account.

What is the best way to have something like paypal which really uses Authorize.net instead of Pp? I have a perl script that does the addition and transmission for me:

(www.papersparkle.com/Authorize/addition.html)

But if I use that, I need another script for viewing cart, etc.

PLEASE HELP!