I see. Then the expectation is that the user charges only at one charger, as otherwise a token might be reused at a different charger. Thanks, sounds interesting!
More or less. We expect our users to charge at a relatively small number of chargers (you might have, say, 10 shared chargers in some buildings), and likewise for chargers to see a relative small number of users over their lifetime. Hope you'll get a chance to use it in a building near you soon!