I'd like to have a one time payment option and a pay over time option using the Stripe integration.

I'd like to accomplish this by having two payment fields, but the form doesn't allow it.

It is possible to have two payment fields in one form.

To set this up you would have to create three forms and an Iframe widget.

Kindly check this guide:https://www.jotform.com/help/182-How-to-Create-a-Basic-Multiple-Payment-Form

If you have further questions, let us know.