{
    "appid": "wx2421b1c4370ec43b",
    "mchid": "10000100",
    "transaction_id": "1008450740201411110005820873",
    "out_refund_no": "R20150806125346",
    "amount": {
        "refund": 50,
        "total": 100,
        "currency": "HKD"
    },
    "reason": "商品已售完"
}