How to pass the calculation from Inventory Widget into paypal?

Now I need to figure out a way to pass the
calculation to paypal, so the customer can
buy the product and the inventory is reduced.
I see in paypal changing the payment
to a donation, but that deletes the items that were
created with the paypal wizard leaving no fields
for the calculator to access.

I see from your latest response on the other thread that you were able to make it work. https://www.jotform.com/answers/854187. For more information on passing a calculation to a payment field, you may also check out this guide: How to pass a calculation to a payment field. Regards.