For CARD_CLICKED and MESSAGE interaction events, the types of interactions with dialogs.

To learn more about Google Chat app interaction events, see Receive and respond to interactions with your Google Chat app.

TYPE_UNSPECIFIED Default value. Unspecified.
REQUEST_DIALOG A user opens a dialog.
SUBMIT_DIALOG A user clicks an interactive element of a dialog. For example, a user fills out information in a dialog and clicks a button to submit the information.
CANCEL_DIALOG A user closes a dialog without submitting information, or the dialog is canceled.