Hi. I've never heard of such a case. It seems to me that in Germany you can't do that to a minor. Unless you have a parent's permission. In fact, you can ask these guys
https://limousine-service.com/limousine-service-berlin-txl-airport. I think whoever is in charge of it should know better whether they have had such cases in practice or not. It would be necessary to check it out. Although you know, I just figured it out, maybe it would be possible to pull off such a scam. Well, for example, to take and pay with my parents' card. The company after that, in principle, can say that the parents paid, so we took him for a ride. If you are really interested you can call and find out. Then you can tell him.