Well, the situation is heterogeneous.
At charging stations of many public services and power suppliers the charging is still free (e.g. enercity in Hannover or EWE in the north of Germany), though you might need an RFID card to activate the charging stations.
Then there are suppliers who charge by time, e.g. RWE with their SMS rate (charging stations activated by SMS, € 3.95/h, limited to 11kW charging power) or The New Motion (stations activated by RFID card, price depending on the charging power: from € 0.63/h at 2.3kW up to € 6.05/h at 22kW).
Some suppliers offer contracts (with or without monthly basic fee) for charging by quantity consumed, e.g. RWE (€ 4.95/month basic fee + € 0.30/kWh) or BEW (no basic fee, € 0.35/kWh). Their stations are activated by a smartphone app.
Some of my fellow EV owners and forum writers may complement this information.