code: function getCacheRefreshInterval() {
      var value = parseInt(process.env[CACHE_REFRESH_KEY]);
  
      // Should we 0 here to invalidate the cache immediately?
      if (value && !isNaN(value) && value > 0) {
        return value;
      }
  
      return DEFAULT_CACHE_REFRESH_SECONDS;
    }
docs: The refresh interval of the authentication cache should be configurable. Since
  this is running inside a cloud app the best option is th use an environment
  variable.
  @returns {*}