HelloBostonHi
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Not a direct answer to your question but I believe the NFC framework at least for android allows for interactions when the phone is unlocked, without requiring a further unlock, depending on the type of interaction. I don't know too much about this but it seems as though phone-locked or screen-off tapping is prohibited so it won't be completely frictionless.
Android allows no interaction when the phone is unlocked, my experience in London is iOS still requires verification when unlocked which was fine when it was as simple as resting your thumb against the fingerprint reader as you tapped in/out, I really hadn't thought about the impacts of face ID. I switched from iPhone a fee years ago...