I do already have a paypal cart on my website. This is allowing them to continue shopping instead of making several different transactions. Paypal offers buttons with only limited fields to add for the personalization details I'm needing to fill the order.
To combine the the form fields Jotform provides with a shopping cart option would definitely be a convenience and make shopping easier on my site. Currently, customers have to make the purchase and come back to the listing to submit their details.