- JotForm SupportBJoannaAnswered on May 28, 2015 at 04:28 AM
You can to that by adding e.g radio buttons to your form and then set Calculation values for radio buttons options.
Then you need to add calculation widget to your form.
Then you can pass a calculation to a payment field. Inside of this article you can find out how to pass a calculation to a payment field:
Hope this will help. Let us know if you need further assistance.