Unable to answer "Do you have to pay to park here?" for https://osm.org/way/1101865856 via StreetComplete 55.1:

This appears to be two separate parking lots, one of which belongs to a business (the gym in the photo) and the other seems to be attached to the city park, and so probably has different rules.

Attached photo(s):
https://westnordost.de/p/190619.jpg