(14) The referrer, relay response or receipt link URL is invalid.

[Nocturnaloner]

Sorry to get personal with this, but isn't that unnecessarily pretty strong of a statement? Won't tell???

Ah, you're probably right. "Didn't" tell. There we go.

Now, in the hopes of possibly making up for that terrible breach in etiquette, allow me to offer what might finally be a solution to this issue:

The documentation is wrong. The instructions that are at the top of the plugin page in the admin are wrong. At least they were for my case.

SETTINGS
Your "response" and "receipt" URL settings in your Authorize.net Merchant Profile can be left BLANK, or can be set to point to http://your_domain.com/foldername/index.php?main_page=checkout_payment

Nope!

The correct Default Receipt URL and Default Response URL are as follows:

https://your_secure_domain.com/foldername/index.php?main_page=checkout_process

Note the checkout_process NOT checkout_payment, and note that no additional arguments like "&action=confirm" should be added.

if you use https://your_secure_domain.com/foldername/index.php?checkout_process&action=confirm, leaving out main_page= it won't work.

If you leave them blank, it won't work. There you go!

[DrByte]

The instructions that are at the top of the plugin page in the admin are wrong. At least they were for my case.

Hmmm. Yes, there's a mistake in the on-screen-admin instructions.
Much more detailed instructions are at: https://www.zen-cart.com/content.php...payment-module

Thanks for posting back your findings. We'll fix that help text with the upcoming v1.5.5 release.

[DavidBowie]

I am having the same issues, same symptoms as originally stated. Any pointer to the updated instructions? Using instructions from the link provided above doesn't seem to work for me. https://www.zen-cart.com/content.php...payment-module

[lat9]

What version of Zen Cart? While this FAQ (https://www.zen-cart.com/content.php...payment-module) doesn't address the change in the checkout_payment vs. checkout_process end-point, it does have a fair amount of information.