That was an informative link.
I want to add that if the total "revenue" for a shop was in the form of a gift card and you decide not to report the gift card as revenue, then you can not deduct any expenses incurred on this shop. The cost of the meal would presumably be offset by the gift card, but you will be unable to deduct mileage, parking, tolls, etc.
@olympia tennenbaum wrote:
[
www.irs.gov] Control F "gift card" to find info quickly
Shopping South Jersey, Southeast Pennsylvania, and Delaware above the canal since 2008