{
    "mch_id": "100000981",
    "sub_mch_id": "10000100",
    "appid": "wxcbda96de0b165486",
    "nonce_str": "5K8264ILTKCH16CQ2502SI8ZNMTM67VS",
    "sign_type": "HMAC-SHA256",
    "trade_scene": "PARKING",
    "sign": "EE088059BBC9141264F8D14293AD6C4BB94CEA8C08AA98FBF93E262D445F8FF5",
    "scene_info": "{\"scene_info\":{\"start_time\":\"20170926114339\",\"plate_number\":\"CB1000sdfasd\",\"car_type\":\"大型车\",\"parking_name\":\"欢乐海岸停车场\",\"free_time\":\"1200\"}}"
}