A colleague of mine at a previous place I worked had the idea of an RFID smart card that had biometrics (fingerprint reader?) built into a wallet (or right on the card). So that way, it's convenient and can't be stolen. And of course there'll be a display on the card showing your current balance and the company name/code you are about to pay. We looked it up and it turns out fingerprint readers do exist that are thin enough, but also there was a company in Finland that may have implemented a similar idea (but i think they no longer exist).
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A colleague of mine at a previous place I worked had the idea of an RFID smart card that had biometrics (fingerprint reader?) built into a wallet (or right on the card). So that way, it's convenient and can't be stolen. And of course there'll be a display on the card showing your current balance and the company name/code you are about to pay. We looked it up and it turns out fingerprint readers do exist that are thin enough, but also there was a company in Finland that may have implemented a similar idea (but i think they no longer exist).