code: public function createAuthorizerApplication($appId, $refreshToken)
      {
          $this->fetch('authorizer', function ($authorizer) use ($appId, $refreshToken) {
              $authorizer->setAppId($appId);
              $authorizer->setRefreshToken($refreshToken);
          });
  
          return $this->fetch('app', function ($app) {
              $app['access_token'] = $this->fetch('authorizer_access_token');
              $app['oauth'] = $this->fetch('oauth');
              $app['server'] = $this->fetch('server');
          });
      }
docs: Create an instance of the EasyWeChat for the given authorizer.
  
  @param string $appId        Authorizer AppId
  @param string $refreshToken Authorizer refresh-token
  
  @return \EasyWeChat\Foundation\Application