I tried searching for the answer but could not find it.
Using Zen Cart 1.38a
Authorize.net SIM
The test gift certificate has been added to my account. It asks how much of it I want to apply to the total.. my total happens to be $7. So I put 7 in the GC box.
It still wants a credit card even though it is covered by the GC. I'm not sure if it is designed like that, or if something is wrong.
No special modules for payment or gc.. just the standard ones that come with Zen Cart.
When I first sent myself the GC I was able to checkout without using a credit card.. not sure what happened..
Thanks