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> Probably a mix of plastic and metal: Full metal cards don’t actually support contactless interfaces!

Well it's really annoying: the "metal" card (maybe as you say a mix of metal and plastic) is harder to swipe, so I got use to present it face down instead of face up, for I noticed that that way I get a better percentage of success on the first try.

I don't have the problem with my full plastic credit/debit cards.



Yeah, the sandwich-type cards usually have one preferred side for contactless taps. That's one advantage of the cutout-style cards, I suppose, but I haven't seen many of these lately.




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