MediaWiki:Apihelp-query+allusers-param-attachedwiki
With $1prop=centralids, also indicate whether the user is attached with the wiki identified by this ID.
With $1prop=centralids, also indicate whether the user is attached with the wiki identified by this ID.
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https://wiki.pastlives.space/MediaWiki:Apihelp-query%2Ballusers-param-attachedwiki