Thanks for the explanation!
There is a dedicated key for this:
https://wiki.openstreetmap.org/wiki/Key%3Aauthentication%3A*

authentication:contactless=yes 
should be the basic tag to describe the method.

Maybe you could add these for the details:
authentication:id_card
authentication:health_insurance_card
Both of these are not in use yet, but should describe the situation rather well.