type property
Input only.
The type of Chat app response. Possible string values are:
- "TYPE_UNSPECIFIED" : Default type that's handled as 
NEW_MESSAGE. - "NEW_MESSAGE" : Post as a new message in the topic.
 - "UPDATE_MESSAGE" : Update the Chat app's message. This is only permitted
on a 
CARD_CLICKEDevent where the message sender type isBOT. - "UPDATE_USER_MESSAGE_CARDS" : Update the cards on a user's message. This
is only permitted as a response to a 
MESSAGEevent with a matched url, or aCARD_CLICKEDevent where the message sender type isHUMAN. Text is ignored. - "REQUEST_CONFIG" : Privately ask the user for additional authentication or configuration.
 - "DIALOG" : Presents a dialog.
 - "UPDATE_WIDGET" : Widget text autocomplete options query.
 
Implementation
core.String? type;