The ID which the new chat should have. Returns an error if a chat with this
ID already exists AND
ignoreExistsError is not true.
Set to true to ignore an error in the case of an existing desired Chat ID
An array of DomainUsers to which this chat is available.
The visibility of the chat room. Must be "public" or "private".
Private chats cannot be joined by a user, but rather added (ChatChannel.add) by another member with the appropriate permissions
An optional name for the chat.
An optional topic for the chat.
The type of chat. Must be "channel" or "room".