I think I've been wearing my Densa hat for a couple of days, but I think that a lightbulb just went off...
Is the idea behind the Paypal add-on to pass on the total amount to Paypal for it to process the transaction and the details to be emailed to me by the form? This makes any "products" created by me previously at Paypal (using their buttons) are now irrelevant and I don't pass this information along from my Gravity Form (but I may pass along the product codes and descriptions that I've created in Gravity) for Paypal to print on their confirmations and receipts?
(If so, that means I need to rethink what I've been doing, since I've been coming to it from the wrong way around, which is why I've been so confused).
Lawrence