Thanks! Probably the easiest thing to do, if you’re still in the area and able to, is to take some photos of the sockets, and of the display on the charging unit and any related signage nearby, and upload them all to a service like geograph.org.uk. Or if you have the StreetComplete app on your phone, you can long-press the charger on the map and add a note with photos attached. The photos should provide all the needed information about the socket types, plus other useful stuff like the payment and authentication process, power output, and fee system. Thanks!