When I refund some postage via Paypal because the buyer didn't wait for a combined invoice (or whatever other reason), this refund carries back through to eBay and appears on the packing slip. So eBay knows the net amount the buyer paid. Why, then, is it necessary to manually request refunds on FVF from eBay? (And not always successfully, from what I'm reading here.) Why can't eBay calculate the FVF refund automatically like Paypal does?