Problem: Users can't purchase only gift certificates using their credit cards (authorize.net).

They can purchase them in conjunction with another item and authorize.net.

They can purchase only gift certificates using paypal.

But if they try to purchase only gift certificates with authorize.net they get the "There has been an error processing your credit card. Please try again." error.

I have been using zencart for years and haven't had issues until yesterday, so please forgive me, my zencart senses are rusty.

The cart is an older version (we plan to upgrade next month) 1.2.2.7
We are using the SIM version of the authorize.net module.

I've scoured through the knowledge base and the forums and I've seen mention of the problem of trying to purchase a single gift certificate but there was no real answer. And it's strange that it works with paypal and not authorize.net.

As always, any help you can give would truly be appreciated!!!