I recently used an electric car charger where the charger is controlled by a mobile app that's basically a thin wrapper over a website. Unfortunately I only had a 0.25 Mb/s Internet plan at the time and it took me several minutes just staring at the splash screen as it was downloading JavaScript and other assets. Even when I got it to load, it hadn't managed to download all fonts. Truly an eye-opening experience.
It wasn't required by law and the ocpp charging protocol, used to manage charge sessions at a high level between the charger and the service provider (not the vehicle) did not include payments management. Everybody just found it easier to manage payments using apps and credits. But I think Europe is going to make it mandatory soon(ish)
