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.
Unfortunately, you can only receive payments on your form using the Payment field available in JotForm.
If you really want to use other payment gateway on your form, you can do this by downloading the source code of your form and modifying it to add the payment processing you want. Here is a guide on how to get the source code: How to get the Full Source Code of your Form. However, you will need to have a knowledge in programming to achieve this. You can hire a 3rd party programmer to help you with this.
Do let us know if you need further assistance.