code: public function addUser($user_create_item, $create_client = null)
      {
          list($response) = $this->addUserWithHttpInfo($user_create_item, $create_client);
          return $response;
      }
docs: Operation addUser
  
  
  
  @param \ProcessMaker\PMIO\Model\UserCreateItem $user_create_item JSON API with the User object to add (required)
  @param string $create_client If not empty - a new Oauth Client would be created along with User (optional, default to 1)
  @return \ProcessMaker\PMIO\Model\UserItem
  @throws \ProcessMaker\PMIO\ApiException on non-2xx response