Quote Originally Posted by DrByte View Post
I think I know what's going on ...
The code that handles that error response was only doing half of the job. There's a small bit missing, which is preventing the order from being saved.

You can make the changes to the /includes/modules/payment/authorizenet_aim.php file, as explained on this page: https://github.com/zencart/zencart/pull/236/files
(the red stuff (and minus signs) indicates lines to remove, and green (and plus signs) indicates addition)
(The plus signs at the beginning of the lines are only to show lines that are added, so don't put those plus signs into your PHP code)

Making that change should solve the symptoms you're reporting.
THANK YOU!! I have made the changes as listed. THANK YOU!