How do you let a guest pay for charging power themselves?

With its own metering point and QR code at the socket or charging station, the guest purchases credit in advance, which automatically decreases during charging. You set your own price per kWh for the charging point, separate from the price for the accommodation. If the guest is also staying in the accommodation, they use one credit for both, with separate insight into what the accommodation and charging have cost. For occasional charging, a dedicated metering point often does not outweigh the costs.