public function getAuthorizeUrl($scope)
    {
        $url = 'https://app.rakuten.co.jp/services/authorize';
        $parameter = array();
        $parameter = array(
            'response_type' => 'code',
            'client_id'     => $this->developerId,
            'redirect_uri'  => $this->redirectUrl,
            'scope'         => $scope
        );

        return $url.'?'.http_build_query($parameter);
    }