I would prefer a free shopping cart, but even a paid cart would be better than redoing the site.
It sounds like what you're looking for is an open-source shopping cart. There are many free ones out there that allow you to access code for you to use like you said, many of which are compatible with Authorize.Net. If you do a search for open source shoppiong carts, you can then decide which one will work best for you and your particular situation.
Hi there. We offer a shopping cart that is very feature-rich and integrates seamlessly with Authorize.net. You can view a sample installation here:
Click the green box on the right to see the back end of the cart.
If you point me to your existing installation, we can take a look at automating the systems as you mention. Let me know if we can help!
oscommerce is the legacy open source cart; it's a bit messy, but you can do whatever you want. I think zencart is a fork of the (pretty much dead) oscommerce code. I'd use zencart over oscommerce, but neither unless you're willing to poke around and figure out their objects and internal api, which aren't really very well documented. However, if you take a few days to do that, you can do whatever you like with it.
I agree with the other posters. Any open source cart should do. We've also implemented Magento for a client and Authorize.net is integrated. There's a tutorial with screens at http://www.magentocommerce.com/knowledge-base/entry/how-do-i-set-up-payment-gateways-payflow-authori... .
Contact me if you need further help. It should be fairly simple.
Can I have both a PayPal shopping cart and one for Authorize.net. Look at my website here
http://www.blacklightshop.com/mbl12.html Nolice the buyer can only purchase one item at a time on Authorrize.net using Simple Checkout and no way to continue shopping. I would like to keep the site as close as possible to what I have now.
Simple Checkout is designed for only one item purchases. If you want to allow for multiple item purchases (e.g. a shopping cart) you will need to create your own shopping cart and then use SIM or AIM.