code: def migration_exchange(self, *, users: List[str], **kwargs) -> SlackResponse:
          
          kwargs.update({"users": users})
          return self.api_call("migration.exchange", http_verb="GET", params=kwargs)
docs: For Enterprise Grid workspaces, map local user IDs to global user IDs
  
          Args:
              users (list): A list of user ids, up to 400 per request.
                  e.g. ['W1234567890', 'U2345678901', 'U3456789012']