── 先摆正对照：同一笔单，trade_no 分支的既有读数（读自原始应答字节）──
  trade_no     = 200001070X4326092816045010002
  pay_trace_no = probe20260928160450h5
  pay_time     = 20260928160450
  正对照读数   = return_code=SUCCESS / return_msg=用户支付中 / result_code=PAY_IN_PROCESS
  正对照必须是「查得到」—— 否则本探针的对照组不成立

── 将发送（不含密钥；sign 打码）──
{
  "inst_no": "900112",
  "mch_no": "Y52211090004",
  "query_trace_no": "04f6029a3a5d4ce382a5a16e4d064b12",
  "pay_trace_no": "probe20260928160450h5",
  "pay_time": "20260928160450",
  "sign": "<len=32>"
}
  注意：**没有** trade_no 这个键 ⇒ 走的正是主扫单走的那条分支

── 出站 ──
  POST https://test.gdyfsk.com/yfpay/v3/queryorder
  bytes = 216

── 上游应答 ──
  http_code = 200, bytes = 614
  attach           = null
  coupon_amount    = null
  discount_amount  = '0'
  end_time         = null
  mch_name         = '建行小店基本休息修改'
  mch_no           = 'Y52211090004'
  pay_amount       = '1'
  pay_time         = '20260928160450'
  pay_trace_no     = 'probe20260928160450h5'
  pay_type         = '300'
  qd_trade_no      = null
  query_trace_no   = '04f6029a3a5d4ce382a5a16e4d064b12'
  receipt_amount   = '0'
  result_code      = 'PAY_IN_PROCESS'
  return_code      = 'SUCCESS'
  return_msg       = '用户支付中'
  shop_name        = ''
  shop_no          = ''
  sign             = '54052b33db75e2c6d06bae0e5457728b'
  td_trade_no      = null
  total_amount     = '1'
  trade_no         = '200001070X4326092816045010002'
  trade_state      = 'USERPAYING'
  user_id          = null

── 判决 ──
  查到了 ⇒ H1：pay_trace_no+pay_time 分支**通**，
          问题只出在「未扫的聚合码单」这个状态上。

── 入站验签（null 不参与）──
  参与签名字段数 = 17
  重算 == 上游 sign : True