JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I just tried submitting the form on you website, and this is the error that occurred:
It might be an issue with your Authorize.net account. Please contact their support staff and have them to verify if you need a new API key.