Notification sent when the user replies to a reply-type suggestion (or to a message) you previously sent. The root message_id is the original outbound message being replied to, and the root status is forced to DELIVERED (data.action is always REPLY).
Origin of the message: direct API send (API) or bulk campaign send (CAMPAIGN).
RCS channel of the send, according to the type of the agent/template used.
Forced to DELIVERED; data.action is always REPLY.
Moment of the event as epoch seconds (string). Redundant with occurred_at; use whichever you prefer.
Optional. Only present when origin is CAMPAIGN and the message belongs to a campaign; omitted otherwise.
Event-specific content; its shape depends on the event type.
