ChatUserInfo
- Type: stringFormat: date-time
joined Chat At the date-time notation as defined by RFC 3339, section 5.6, for example, 2017-07-21T17:32:28Z
- Type: stringFormat: uuid
last Seen Message - Type: stringFormat: uuid
user Id - Type: string
username
the date-time notation as defined by RFC 3339, section 5.6, for example, 2017-07-21T17:32:28Z