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

I could accomplish this by creating two stripe fields and using conditional logic, but the form doesn't allow me to include two payment fields.

To clarify, do you want to create a subscription payment form?

It is possible to setup a recurring and one time purchase for Stripe.

You may check this guide (do note the guide maybe PayPal but they have the same fields with Stripe):https://www.jotform.com/help/166-How-to-Setup-a-Recurring-Payment-Option

It is possible to include two payment options in one form however, you would have to use a total of three forms and an Iframe widget.

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

Hope this information helps.

If you need further assistance, let us know.