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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Dave_Smart
You could probably combine NFC and BLE to do it. I've already implemented BLE payments with DroidScript and Paypal on an Android tablet acting as a BLE server/advertiser... but I used a Puck as my test server before I got hold of the tablet. You might be able to trigger off the BLE comms process using the NFC and then authorise a payment using PayPal or Stripe after some handshaking over BLE