Quote Originally Posted by lat9 View Post
I've replicated this issue on my demo site. The "invalid card" message is coming back from a.net, but isn't getting posted to the One-Page Checkout's data-gathering page. I'll note this as an issue in the plugin's GitHub repository; it might take me a couple of days for resolution.

We were lucky and "dodged the Irma bullet" with just a couple of trees and a lot of branches down.
OK, so a couple of days turned into a couple of weeks. Looking at this issue, I'm starting to form the opinion that it's a base Zen Cart issue with the AJAX confirmation. When the 'invalid card' message is received, the AJAX processing is redirecting back to the checkout_payment page for the display instead of returning the information "in-line" on the AJAX call.

Just in case it's my setup, would you verify that you don't receive the message when One-Page Checkout is disabled (i.e. going through the standard, 3-page version)?