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.
You can setup an order form with a payment integration on them. Here are some guides that you can refer:
When your user successfully submitted the form and paid for the transaction, you can redirect either:
1. Redirect them on show them the download link of your product in the "Thank You" page.
I hope this helps.