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 have tested the payments through Authorize.net using my sandbox account and see that it is working fine at my end. Are you still experiencing the issue with the payments on your form? Please try removing the payment field and add it once again to see if that works. The issue might also be with the credit card being used in which a different card can be tried.
Let us know if you need any further assistance. We will be happy to assist.