It’s now 2022 and came here looking for a answer to this as well, years and not one answer…
There’s an eBay 10% off code until midnight, a seller has sent me an offer price less than the original price. I was to accept that particular price, then use the eBay 10% off……. What I don’t want is to accept the offer and then can’t use the code off…. Still we wonder one day maybe lol