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I was under the impression that Amazon is using RFID for "just walk out". They filed patents for a "shelf with integrated electronics", which mentions RFID as a potential implementation [0].

Does anyone here know for sure whether "just walk out" uses RFID?

[0] https://sqoop.com/details/uspto/10064502

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If this really is the same tech they use for Amazon Go then no. I'm not sure where they would have hid an RFID chip in the single apple I picked up from their larger store a week ago.

Might there have been an RFID sticker on that apple you bought? Something like this one: https://www.amazon.com/YARONGTECH-50pcs-MIFARE-Classic-adhes...

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