public static function info($access_token)
    {
        $opts = array('http' => array(
            'method'  => 'GET'
        ));

        $url = self::$clef_base_url."info?access_token=".$access_token;

        // exchange the oauth token for the user's info
        $context  = stream_context_create($opts);
        $response = file_get_contents($url, false, $context);

        if (!$response) {
            $response = json_decode($response, true);

            return $response;
        }

        return false;
    }