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Comment on Ask HN: Credit Card reader similar to Square but with API

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If I were to allow someone to swipe my card through one of these readers, or any similar reader, how do I know there isn't a software 'skimmer' bundled with whichever app they're using to process the payment?

For the same price, how do you know the phone using Square isn't using a skimmer? I've heard that Square doesn't encrypt the data...

That's why I wrote "or any similar reader".

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