We don't want to carry out an Apple Pay transaction or even come close, but is it possible to read anything at all from the Apple Pay facility that will uniquely identify the phone. (We want to use an iPhone as an access control pass)
Dear Dave Bush, I am not sure if this can be possible since the payment systemsare meant to detect an EMV transaction, so what you want to do is emulate a payment method with the "badge" of the student, worker, whatever your access is for and emulate a EMV transaction and use this payment method to send the information ? I am not sure if this is possible since it is done for EMV compliant transactions. I would recommend check with the apple team or community to see if this is feasible or not using that phone.
Apple PassKit provides a framework for iPhone users to load things besides their credit cards into their Apple Wallets, e.g. loyalty cards, membership cards, ticketing, etc. (Google provides a similar Framework). The contactless reader needs to support Apple Value Added Services Protocol (AppleVAS). I don't see any reason why a card reader could not be implemented as an AppleVAS-only device, without support for payment cards. Please see: Wallet Developer Guide
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