Unable to answer "Do you have to pay to use this restroom?" – Restroom – https://osm.org/node/11889375064 via StreetComplete 62.2:

WC hinter geschlossener Tür. Scheint derzeit außer betrieb zu sein. Siehe Foto

Attached photo(s):
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https://streetcomplete.app/p/328109.jpg
https://streetcomplete.app/p/328110.jpg
https://streetcomplete.app/p/328111.jpg