```

feat(shopro_huifu): 完善汇付分账服务功能

- 实现分账确认金额解析逻辑，确保与汇付待确认金额一致
- 添加分账项目缩放调整功能，防止分配总额超出限制
- 优化分账金额计算精度处理，使用BC数学函数保证准确性
- 改进后台重试接口错误提示，提供详细的失败原因信息
```

addons/shopro_huifu/library/HuifuSplitService.php

@@ -45,10 +45,22 @@ class HuifuSplitService
         }
 
         $payFee = number_format((float) $order['pay_fee'], 2, '.', '');
-        $acctInfos = $this->buildAcctInfos($items, $payFee);
+        $confirmBase = $this->resolveConfirmPayFee($order['order_sn'], $payFee);
+        if (bccomp($confirmBase, $payFee, 2) !== 0) {
+            \think\Log::info('[shopro_huifu] split confirm base: order_id=' . $orderId
+                . ' pay_fee=' . $payFee . ' confirm_base=' . $confirmBase);
+        }
+        $allocated = '0.00';
+        foreach ($items as $item) {
+            $allocated = bcadd($allocated, number_format((float) $item['amount'], 2, '.', ''), 2);
+        }
+        if (bccomp($allocated, $confirmBase, 2) > 0) {
+            $items = $this->scaleSplitItemsToCap($items, $allocated, $confirmBase);
+        }
+        $acctInfos = $this->buildAcctInfos($items, $confirmBase);
         $splitAmount = '0.00';
-        foreach ($acctInfos as $info) {
-            $splitAmount = bcadd($splitAmount, $info['div_amt'], 2);
+        foreach ($items as $item) {
+            $splitAmount = bcadd($splitAmount, number_format((float) $item['amount'], 2, '.', ''), 2);
         }
 
         $outOrderNo = 'HFPS' . date('YmdHis') . $orderId;
@@ -163,6 +175,73 @@ class HuifuSplitService
         return $infos;
     }
 
+    /**
+     * 延时分账确认总额须与汇付「待确认/交易金额」一致；内扣手续费时往往小于商城 pay_fee。
+     */
+    protected function resolveConfirmPayFee($orderSn, $orderPayFee)
+    {
+        $fallback = number_format((float) $orderPayFee, 2, '.', '');
+        try {
+            $query = (new HuifuQueryService())->queryByOrderSn($orderSn);
+            $unconfirm = trim((string) ($query['unconfirm_amt'] ?? ''));
+            if ($unconfirm !== '' && is_numeric($unconfirm)) {
+                $amt = number_format((float) $unconfirm, 2, '.', '');
+                if (bccomp($amt, '0.00', 2) > 0) {
+                    return $amt;
+                }
+            }
+            $trans = trim((string) ($query['trans_amt'] ?? ''));
+            if ($trans !== '' && is_numeric($trans)) {
+                $transAmt = number_format((float) $trans, 2, '.', '');
+                foreach (['fee_amt', 'fee_amount', 'trans_fee'] as $feeKey) {
+                    $feeRaw = trim((string) ($query[$feeKey] ?? ''));
+                    if ($feeRaw === '' || !is_numeric($feeRaw)) {
+                        continue;
+                    }
+                    $net = bcsub($transAmt, number_format((float) $feeRaw, 2, '.', ''), 2);
+                    if (bccomp($net, '0.00', 2) > 0 && bccomp($net, $fallback, 2) < 0) {
+                        return $net;
+                    }
+                }
+                if (bccomp($transAmt, '0.00', 2) > 0) {
+                    return $transAmt;
+                }
+            }
+        } catch (\Throwable $e) {
+            \think\Log::warning('[shopro_huifu] split confirm amount query fallback: ' . $e->getMessage());
+        }
+        return $fallback;
+    }
+
+    protected function scaleSplitItemsToCap(array $items, $allocated, $cap)
+    {
+        if (empty($items) || bccomp($allocated, '0.00', 2) <= 0) {
+            return $items;
+        }
+        $cap = number_format((float) $cap, 2, '.', '');
+        $allocated = number_format((float) $allocated, 2, '.', '');
+        if (bccomp($allocated, $cap, 2) <= 0) {
+            return $items;
+        }
+        $scaled = [];
+        $sum = '0.00';
+        $count = count($items);
+        foreach ($items as $index => $item) {
+            if ($index === $count - 1) {
+                $item['amount'] = (float) bcsub($cap, $sum, 2);
+            } else {
+                $ratio = bcdiv($item['amount'], $allocated, 8);
+                $part = bcmul($cap, $ratio, 2);
+                $item['amount'] = (float) $part;
+                $sum = bcadd($sum, $part, 2);
+            }
+            if ($item['amount'] > 0) {
+                $scaled[] = $item;
+            }
+        }
+        return $scaled;
+    }
+
     public function querySplit($hfSeqId)
     {
         SdkLoader::requireRequest('V2TradeTransSplitQueryRequest.php');