@mhoye This reminds me of a very curious bank card terminal embedded into a wall I saw in a student cafeteria once.

It turned out to be a terminal to recharge Proton credit, a local and mostly unsuccessful micropayment system from the early 2000s, before bank cards were able to do that effectively (due to I presume limited internet connectivity). It was shut down in 2014 officially but effectively deprecated long before that. So this was a device that had been out of operation for at least a decade, probably longer and I felt like I was the first person in that same time period to pay any attention to it or recognize what it was.