Refueling and charging cambio cars is very easy with a fuel or charging card.
Charging: You can charge the cambio e-cars with the charging card in the car (logbook). You can find out exactly how to do this here.
Refueling: If you urgently need fuel for your cambio car, please use the cambio fuel card. It can usually be found in the logbook and is valid throughout Europe.
Please note that charging and refueling cars at hvv switch is not rewarded with e.g. free minutes, bonus points or similar.