There was an error processing your credit card.

I'm using the Authorize.net add-on for my client's website on two pages.

https://www.rccaconcerts.org/donate-now/
https://www.rccaconcerts.org/season-membership/

SSL is all set and the API Login ID and Transaction Key give me the green checkmarks. But whenever I try to submit a transaction I get, "There was an error processing your credit card. Please verify the information and try again." in the credit card field. I set up a test form, thinking maybe it was my form, but get the same error on my test form. I've tried test credit card numbers and get the same error. I contacted AuthNet's chat support. They say it's not hitting Authorize.net. Suggestions?

According to Authorize.net, the <!-- Error: 33 --> error is part of a full response string. Their support tells me that my software (Gravity Forms) is converting the long string into this short error. They tell me that this full string would tell me which field is blank. How can I see that full string in Gravity Forms?

Thanks for your help, Chris. Installed the Gravity Forms Logging add-on and was able then to see the full error string that Authorize.net passes back. It showed that the phone number was the empty field. Weird, since there is a required phone number field on my form, but for whatever reason Authorize.net did not see it. In my Authorize.net merchant control panel under Account--Payment Form--Form Fields, I can select which fields are required by AuthNet. I deselected Phone, and boom, it worked.