Quote Originally Posted by billc108 View Post
What files aside from includes/modules/payment/authorizenet_aim.php are involved in accepting Authorize.net AIM payments?
Other than the related language file of the same name, that's it.

If the ID+key from the other a-net account worked fine, then I'm inclined to blame the account. What did authnet staff say about the 3.0 vs 3.1 ?
As an aside, I assume you've regenerated a new transaction key as part of your troubleshooting?