diff --git a/tests/Feature/AdminBillingClosedLoopRenewalMissingSubscriptionSopTest.php b/tests/Feature/AdminBillingClosedLoopRenewalMissingSubscriptionSopTest.php
new file mode 100644
index 0000000..41a68cf
--- /dev/null
+++ b/tests/Feature/AdminBillingClosedLoopRenewalMissingSubscriptionSopTest.php
@@ -0,0 +1,129 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Merchant;
+use App\Models\Plan;
+use App\Models\PlatformOrder;
+use App\Models\SiteSubscription;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+/**
+ * 收费闭环（可验收 SOP）：续费缺订阅治理
+ *
+ * 目标：把一条“无需开发兜底”的续费治理 SOP 锁住：
+ * - 存量续费单缺订阅（site_subscription_id 为空）时：BMPA 必须阻断
+ * - 运营先绑定正确订阅（attach-subscription）
+ * - 然后补回执并执行 BMPA：应完成订阅同步/续期，订单进入 activated
+ */
+class AdminBillingClosedLoopRenewalMissingSubscriptionSopTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_sop_renewal_missing_subscription_bind_then_receipt_then_bmpa_should_activate_and_keep_subscription(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+
+        $plan = Plan::query()->create([
+            'code' => 'sop_renewal_missing_sub_monthly',
+            'name' => 'SOP续费缺订阅（月付）',
+            'billing_cycle' => 'monthly',
+            'price' => 30,
+            'list_price' => 30,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        // 准备一条“正确订阅”（模拟真实续费对应的订阅）
+        $sub = SiteSubscription::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'status' => 'activated',
+            'source' => 'manual',
+            'subscription_no' => 'SS_SOP_RENEWAL_0001',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'amount' => 30,
+            'starts_at' => now()->subDays(10),
+            'ends_at' => now()->addDays(10),
+            'snapshot' => [],
+            'meta' => [],
+        ]);
+
+        // 准备一条“续费单但缺订阅”订单（存量脏数据）
+        $order = PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'order_no' => 'PO_SOP_RENEWAL_MISS_SUB_0001',
+            'order_type' => 'renewal',
+            'site_subscription_id' => null,
+            'status' => 'pending',
+            'payment_status' => 'unpaid',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'quantity' => 1,
+            'payable_amount' => 30,
+            'paid_amount' => 0,
+            'placed_at' => now()->subMinutes(10),
+            'meta' => [],
+        ]);
+
+        // 1) 缺订阅时 BMPA 必须阻断
+        $res = $this->from('/admin/platform-orders/' . $order->id)
+            ->post('/admin/platform-orders/' . $order->id . '/mark-paid-and-activate');
+        $res->assertRedirect('/admin/platform-orders/' . $order->id);
+        $res->assertSessionHas('warning');
+
+        $order->refresh();
+        $this->assertNull($order->site_subscription_id);
+        $this->assertSame('pending', (string) $order->status);
+        $this->assertSame('unpaid', (string) $order->payment_status);
+
+        // 2) 运营先绑定正确订阅
+        $this->post('/admin/platform-orders/' . $order->id . '/attach-subscription', [
+            'site_subscription_id' => $sub->id,
+        ])->assertRedirect();
+
+        $order->refresh();
+        $this->assertSame($sub->id, (int) $order->site_subscription_id);
+
+        // 3) 补回执（用于对账留痕）
+        $this->post('/admin/platform-orders/' . $order->id . '/add-payment-receipt', [
+            'type' => 'bank_transfer',
+            'channel' => 'icbc',
+            'amount' => 30,
+            'paid_at' => now()->format('Y-m-d H:i:s'),
+            'note' => '续费回执（测试）',
+        ])->assertRedirect();
+
+        // 4) 再执行 BMPA：应推进订单为 activated，且仍绑定原订阅（不应生成新订阅）
+        $this->post('/admin/platform-orders/' . $order->id . '/mark-paid-and-activate')
+            ->assertRedirect();
+
+        $order->refresh();
+        $this->assertSame('paid', (string) $order->payment_status);
+        $this->assertSame('activated', (string) $order->status);
+        $this->assertSame($sub->id, (int) $order->site_subscription_id);
+
+        // 订阅应仍可用（至少能被正常读取）
+        $sub->refresh();
+        $this->assertSame($merchant->id, (int) $sub->merchant_id);
+        $this->assertSame($plan->id, (int) $sub->plan_id);
+    }
+}