I was having some problems with the default authorize.net module, so I switched over to Ponce's authorize.net module, dated 11 Jan 2008.

I was getting a generic error message:

There has been an error processing your credit card. Please try again and if problems persist, please try another payment method.

and the corresponding URL:

https://www.mydomain.com/checkout_pa...&error=general

It was a headache, but I resolved it. I posted my fix here.

Jeff Wigal