/** The key of the configuration. e.g. 60 */
    String THUMBNAIL_SYSTEM_MONITOR_INTERVAL = "thumbnail.system.monitor.interval";

    /** The key of the configuration. e.g. userCode */
    String USER_CODE_REQUEST_PARAMETER = "user.code.request.parameter";

    /** The key of the configuration. e.g. 20 */
    String USER_CODE_MIN_LENGTH = "user.code.min.length";