TURN REST API flag. Flag that sets a special authorization option that is based upon authentication secret. This feature can be used with the long-term authentication mechanism, only. This feature purpose is to support "TURN Server REST API", see "TURN REST API" link in the project's page https://github.com/coturn/coturn/
This option is used with timestamp:
usercombo -> "timestamp:userid" turn user -> usercombo turn password -> base64(hmac(secret key, usercombo))
This allows TURN credentials to be accounted for a specific user id. If you don't have a suitable id, the timestamp alone can be used. This option is just turning on secret-based authentication. The actual value of the secret is defined either by option static-auth-secret, or can be found in the turn_secret table in the database.