对外提供退款回调通知结果DTO(对外提供退款回调通知结果DTO)

{
    "appId": "string",
    "channelOrderNo": "string",
    "channelPayOrderNo": "string",
    "createdTime": "string",
    "errCode": "string",
    "errMsg": "string",
    "extJsonb": {},
    "mchRefundNo": "string",
    "payAmount": "string",
    "refundAmount": "string",
    "refundState": "string",
    "successTime": "string"
}