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@whitequark
And to add to the horror, all of the cars and chargers are in the same physical powerline broadcast domain, so when another car is plugged in, it needs to broadcast ping and measure the response signal strength(*) to find out which charger it's connected to...

And once the data channel is up, you authorize the payment with the absolutely unforgeable and secret... *checks notes* serial number of your RFID card!

(*) SLAC (Signal Level Attenuation Characterization)