Authorize.Net Error Message "The referrer, relay response or receipt link URL is invalid."

When working with Authorize.Net Relay Response, you may encounter the following error message:

The following errors have occurred.
(14) The referrer, relay response or receipt link URL is invalid.

This may occur if you have configured the x_relay_URL field with a value which is not configured in Authorize.Net account management.  Therefore, if the value passed in this field DOES NOT MATCH any of the currently configured Urls in the Response/Receipt URLs section, you will receive the above error message.

So how do you go about fixing this error message?

You need to go into Authorize.Net Account settings and update the Urls so that they match what you are passing the x_relay_URL hidden field of your form.

1.    Log into Authorize.Net
2. Click on the Account tab
3. Click on the Response/Receipt URLs link
4. Add a new URL in the list of Response/Receipt URLs