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.
If I understand your question correctly, you are trying to get the amount of payment from calculation field to payment tool.
At that situation, you can uncheck the This is a donation. We are a non-profit organization. option and change the description as you see below:
Please, kindly check the guides that I've provided you. If you have any question or issues, please let us know.