I also wanted to scan my Costco membership card the other day and was not about to hand my phone over to the cashier, those folks are busy enough multi tasking and getting customers out quickly. I could just see my S6 edge+, slipping out of their hands and flying across the concrete flooring, yikes...
They should have a handheld scanner so they could just reach over and scan your card. I know at Sams club here they have to hold onto your card until transaction is over I believe, but yet I haven't tried my samsung club on spay.
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