MediaWiki:Apihelp-query+globaluserinfo-param-prop/en

Which properties to get:
 * groups:Get a list of global groups this user belongs to.
 * rights:Get a list of global rights this user has.
 * merged:Get a list of merged accounts.
 * unattached:Get a list of unattached accounts.
 * editcount:Get the user's global editcount.