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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.
@Gordon
I don't think so - not without a lot of effort. I think for the payment you really need some proper two-way communications... And if you wanted to do NFC payments via a standard payment gateway I bet you're looking at all kinds of certification and pain.
Having said that if you wanted to bodge something up yourself (using NFC to forward to a URL with a unique token that authorises a payment) then you could do that.