How to create a form to collect payment?

That is possible. You can sell products or ask for donations to your form by adding a Payment Gateway. Please check this guide: https://www.jotform.com/help/165-Setting-Up-Your-First-Order-Form

After that, you can also check this related guides:

https://www.jotform.com/help/47-Order-Form-Basics

https://www.jotform.com/help/50-PayPal-Forms

If you need further help, please let us know. We'll be happy to assist you. Thank you.