I've never really done much detailed parking tagging. I think Mobilly is just a payment processor (so `payment:Mobilly=yes` or something). The actual `operator` would be `EuroPark`. I think the code/value you use to pay goes into the `ref` field, like https://www.openstreetmap.org/way/182184579 may be. Then there's `fee=yes/no`, `charge=whatever` and whatever other tags. I might actually need to read one of those signs some day. I don't really see any consistent tagging across these in Riga. I think many are even wrong/outdated.

The brand database used by parcel lockers and such auto-tagging is at https://nsi.guide/?t=brands and new ones can be requested or added at https://github.com/osmlab/name-suggestion-index/issues . No one has had the time/chance to do these yet.