Optional
agent_For messages that are sent between the user and a human agent, we assign an agent type to the message to distinguish what type it is.
Optional
message_Options that control additional features available for a message item.
The response type of this message item.
Optional
streaming_Metadata used identify a generic item within the context of a stream in order to correlate any updates meant for a specific item.
Optional
user_An optional buckets of additional user defined properties for this item.
A user defined item returned in a message response from a back-end.