I walk in, order my food, slide my card, and the cashier gives me a confused look. She then says to me, as though it should have been obvious, "it's cash only." The only reason I go to a place like McDonalds is for a consistent experience, and one of those consistencies is usually that I know I can pay with a card. It's 2015. If you don't accept cash, you need to put up a sign and let your customers know.