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');
        });
    }