In the near future electric vehicles are expected to become ever more common. Due to the comparably low energy density of batteries in relation to the liquid fuels of today, vehicles will be required to recharge more often. In many cases this can be achieved in private premises such as private garages where billing for consumed energy is not a problem. However a large part of the population living in cities around the world relies on roadside parking where convenient billing for consumed energy is of interest. Charging of a large fleet of electric vehicles might also pose a significant threat to the stability of the electrical grid. For this purpose demand side management has appeared as a way to negotiate the risks. Both automated billing and demand side management require information to be transmitted between the consumer and external partners. In this paper we compare different ways to fulfill this need for information exchange and propose a cost efficient solution.