It is a dynamic object that can be modified by the admin. By default, it contains four attributes id, firstName, isAnoymous and additionalDetail given as follows. It can be sent asnullor customer information can also be sent by 3rd party.
This object contains properties related to the session that has been established through a particular channel e.g. web, voice etc. Each customer conversing with an agent/bot will have their own channel session.