Have a Samsung S8 with Samsung Pay set up. Doesn't work. Tried it at Walmart, Best Buy, Kohl's, Sam's Club, and 2-3 others. Probably a total of 15-20 times. I've tried holding the phone over the card reader, tapping the reader, holding it at the chip reader. Apparently, the card reader never senses the presence of the phone. FWIW, in 3-4 of the stores, the cleck says no Samsung Pay phone has worked on their readers. What am I missing?