Is there a way to set up a "cart" for the registrant to view his/her order prior to initiating payment?

5) Is there a way to set up a "cart" for the registrant to view his/her order prior to initiating payment?

After you have created your order form.

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

https://www.jotform.com/help/49-Order-Form-Types

You can add a Preview Before Submit widget to your form that will serve as your cart.

Below is a sample Form:

https://www.jotform.me/form/63123158540449

I hope this helps. Feel fee to contact us anytime if you have other questions regarding this. Thank you.