code: public function syncUsersToGroup($id, $group_sync_users_item)
      {
          list($response) = $this->syncUsersToGroupWithHttpInfo($id, $group_sync_users_item);
          return $response;
      }
docs: Operation syncUsersToGroup
  
  
  
  @param string $id ID of group to be modified (required)
  @param \ProcessMaker\PMIO\Model\GroupSyncUsersItem $group_sync_users_item JSON API with array of users IDs to sync (required)
  @return \ProcessMaker\PMIO\Model\ResultSuccess
  @throws \ProcessMaker\PMIO\ApiException on non-2xx response