Danielle did an awesome job with this one. The issue with this is more on the Internet Secure side.
To answer your question you can not change that. While IS offers the ability to return the authorization success/failure, InteracOnline does not. They make you port out to thier site for what they call "security reasons". Because of this, IS has no choice but to return a success to Zen Cart.
I have had the exact scenario as per above. There are a few ways you can handle it.
1. Delete the order from Zen and ask the customer to re-enter everything into thier cart again
2. Use the Master Password mod (
http://www.zen-cart.com/index.php?ma...roducts_id=190) to log in as the user, print out a copy of the order, logged in as the user, add everything to their cart, log out, let the user know you have returned thier purchase to their cart and they can log in and checkout again.
I could not find a way to return the items purchased back to the shopping cart otherwise.