You will need to submit a form to test the functionality, then when you receive the validation error message, view source. Find in the source where the validation message is output in the Credit Card field and there will be an HTML comment containing the actual Authorize.Net error code. We'd then have to look up what that Authorize.Net error code is.
If you have AJAX enabled on your form, you need to disable the AJAX option before doing this because if AJAX is enabled when you view the source you won't see the message due to how the AJAX works.
Posted 8 years ago on Tuesday May 22, 2012 | Permalink