MerchantRefundCallback

{
    "event": "refund.status_updated",
    "refund": {
        "uuid": "095be615-a8ad-4c33-8e9c-c7612fbf6c9f",
        "transaction_id": "0fec1e58-b197-4052-99cf-2218496c5482",
        "status": "requested",
        "amount_minor": 0,
        "currency": "string",
        "succeeded_at": "2019-08-24T14:15:22.123Z",
        "failed_at": "2019-08-24T14:15:22.123Z"
    }
}