The ID of the chat to add the member to. Can be obtained by using the List Chats action.
Note: The dynamic dropdown is supported only for OAuth (delegated) connections.
Member
The ID or email of the member to add to the chat.
Visible History Start
The timespan for the conversation history the member will be able to view. Leave blank to share no chat history. Or set to 0001-01-01T00:00:00Z to share all chat history.