Event type - defaults to "call" if not specified

Unique reference for this webhook event

Source phone number (required for call events)

Destination phone number (required for call events)

Call status (required for call events)

Call direction (required for call events)

Call begin date in UTC (required for call events)

Call end date in UTC (required for call events)

Call answer date in UTC (required for call events)

Notes content (optional - triggers reservation-change-note creation when combined with reservation.id)