In Admin->Modules->Payment, which payment modules have green or yellow dots beside them?

I bet you're not even using the Authorize.net module at your payment page, but instead you're probably using the Offline CC module and thus nothing's even hitting the gateway, as you said.

The SIM module in its default configuration DOES NOT collect the CC number while on your store. So, if you're filling in your CC number on your store page, then you're NOT using the SIM module, but instead most likely the offline cc module.


If you'd turned on AIM as I suggested you would have suddenly seen 2 sets of CC input fields on the checkout page, and surely would then have asked "why" that was, and probably would have saved some troubleshooting time. And maybe some of my hair.