平台订单：单笔对账明细CSV导出（支付回执+退款记录）

app/Http/Controllers/Admin/PlatformOrderController.php

@@ -413,6 +413,65 @@ class PlatformOrderController extends Controller
         ]);
     }
 
+    /**
+     * 导出单笔订单的“对账明细”（支付回执 + 退款记录）CSV。
+     * 用于运营线下对账沟通/留档，不依赖订单列表的筛选口径。
+     */
+    public function exportLedger(Request $request, PlatformOrder $order): StreamedResponse
+    {
+        $this->ensurePlatformAdmin($request);
+
+        $order->loadMissing(['merchant', 'plan', 'siteSubscription']);
+
+        $paymentReceipts = (array) (data_get($order->meta, 'payment_receipts', []) ?? []);
+        $refundReceipts = (array) (data_get($order->meta, 'refund_receipts', []) ?? []);
+
+        $filename = 'platform_order_' . $order->id . '_ledger_' . now()->format('Ymd_His') . '.csv';
+
+        return response()->streamDownload(function () use ($order, $paymentReceipts, $refundReceipts) {
+            $out = fopen('php://output', 'w');
+
+            // UTF-8 BOM，避免 Excel 打开中文乱码
+            fwrite($out, "\xEF\xBB\xBF");
+
+            // 订单摘要（两行）
+            fputcsv($out, ['order_id', (string) $order->id]);
+            fputcsv($out, ['order_no', (string) $order->order_no]);
+            fputcsv($out, []);
+
+            // 明细表头
+            fputcsv($out, ['record_type', 'channel', 'amount', 'biz_time', 'created_at', 'admin_id', 'note']);
+
+            foreach ($paymentReceipts as $r) {
+                fputcsv($out, [
+                    'payment',
+                    (string) (data_get($r, 'channel') ?? ''),
+                    (string) (data_get($r, 'amount') ?? ''),
+                    (string) (data_get($r, 'paid_at') ?? ''),
+                    (string) (data_get($r, 'created_at') ?? ''),
+                    (string) (data_get($r, 'admin_id') ?? ''),
+                    (string) (data_get($r, 'note') ?? ''),
+                ]);
+            }
+
+            foreach ($refundReceipts as $r) {
+                fputcsv($out, [
+                    'refund',
+                    (string) (data_get($r, 'channel') ?? ''),
+                    (string) (data_get($r, 'amount') ?? ''),
+                    (string) (data_get($r, 'refunded_at') ?? ''),
+                    (string) (data_get($r, 'created_at') ?? ''),
+                    (string) (data_get($r, 'admin_id') ?? ''),
+                    (string) (data_get($r, 'note') ?? ''),
+                ]);
+            }
+
+            fclose($out);
+        }, $filename, [
+            'Content-Type' => 'text/csv; charset=UTF-8',
+        ]);
+    }
+
     public function activateSubscription(Request $request, PlatformOrder $order, SubscriptionActivationService $service): RedirectResponse
     {
         $admin = $this->ensurePlatformAdmin($request);