{
    "mch_id": "123456",
    "nonce_str": "5087e0xessefellkg",
    "sign": "xxxxxx",
    "sign_type": "HMAC-SHA256",
    "begin_time": "2017-07-02 0:0:0",
    "end_time": "2017-07-29 23:59:59"
}