{
  "event_type": "STANDARD",
  "order_uuid": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
  "merchant_id": "ghm-1234567890",
  "cancelled_by": "DINER",
  "reason": "Out of an item.",
  "cancelled_at": "2026-06-02T18:30:00Z"
}