Is there any way to create a sliding scale or payment option

I'm not completely sure what you meant by a sliding scale or payment option. In case you're asking how to allow your form to collect payments, what you need is a payment field to be added on your form.

Here's a complete list of all payment processors we integrate with: https://apps.jotform.com/category/payment_processing

If all you need is some sort of Payment Authorization (e.g. charge your users at a later date), then your choices would be limited to Stripe, Paypal or Authorize.net.

Complete guide: How-to-Enable-Payment-Authorization 

In case you're not sure which one will work for you, I recommend reading this article: Which-Payment-Processor-is-Right-for-Your-Business 

Once you're decided which one to use, just add it to your form and setup the payment wizard. The guide compendium below should help you get started on building your payment form.

Chapter-7-Payment-Forms 

In case we misunderstood your question, just get back to us with a bit more info and a clearer description of what you're trying to do so we can better assist you.