code: public function getOpenWork()
      {
          if (!self::$_openWork instanceof Factory)
          {
              self::$_openWork = Factory::openWork(Yii::$app->params['wechatOpenWorkConfig']);
          }
  
          return self::$_openWork;
      }
docs: 获取 EasyWeChat 企业微信开放平台实例
  
  @return Factory