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.
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Let me please inform you, that the form payment tools support their native Sandbox modes. In other words, each major Payment tool can be turned into a Sandbox test mode.
We have a guide about Authorize.net testing here:
If you have questions about some particular Payment Tool, please open a new thread. We will do our best to help.