What are Guest Session Token requirements?

The client messaging app generates the unique Guest token required by Web Messaging APIs, which is a unique string that uses a UUID. Web messaging does not enforce any strict rules nor applies any checks.  To ensure guest token is unique, we recommend using a 32 hexadecimal digits Universally Unique Identifier (UUID).  Web messaging API does not enforce any specific check on the format and the token cannot exceed 2048 characters.