What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
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.
Sandbox mode is a testing mode that mimics the live production environment for PayPal transactions. Its sole purpose is to conduct test transactions using assigned email addresses that you would get when you create a Sandbox account.
You can create a SandBox account here:
You can read more about it on this guide:
I hope this helps. Do not hesitate if further assistance is needed.