update pay promo

src/components/Subscription/SubscriptionContentNew.tsx

@@ -153,6 +153,7 @@ export default function SubscriptionContentNew() {
   const [promoCodeApplied, setPromoCodeApplied] = useState(false);
   const [promoCodeError, setPromoCodeError] = useState('');
   const [validatingPromo, setValidatingPromo] = useState(false);
+  const [promoCodeFromUrl, setPromoCodeFromUrl] = useState(false); // 标记优惠码是否来自URL
 
   const [paymentOrder, setPaymentOrder] = useState(null);
   const [paymentCountdown, setPaymentCountdown] = useState(300);
@@ -197,6 +198,18 @@ export default function SubscriptionContentNew() {
     fetchSubscriptionPlans();
   }, []);
 
+  // 组件加载时解析URL中的优惠码参数
+  useEffect(() => {
+    const urlParams = new URLSearchParams(window.location.search);
+    const promoFromUrl = urlParams.get('promo') || urlParams.get('code') || urlParams.get('coupon');
+    if (promoFromUrl) {
+      const trimmedCode = promoFromUrl.trim().toUpperCase();
+      setPromoCode(trimmedCode);
+      setPromoCodeFromUrl(true);
+      logger.debug('SubscriptionContentNew', '从URL获取优惠码', { promoCode: trimmedCode });
+    }
+  }, []);
+
   // 检查是否从支付宝支付返回（手机端支付完成后会跳转回来）
   useEffect(() => {
     const checkAlipayReturn = async () => {
@@ -405,6 +418,7 @@ export default function SubscriptionContentNew() {
     setPromoCode('');
     setPromoCodeApplied(false);
     setPromoCodeError('');
+    setPromoCodeFromUrl(false); // 重置URL来源标记
     if (selectedPlan) {
       await calculatePrice(selectedPlan, selectedCycle, null);
     }
@@ -433,7 +447,36 @@ export default function SubscriptionContentNew() {
     // 切换套餐时重置协议勾选状态
     setAgreementChecked(false);
 
-    await calculatePrice(plan, selectedCycle, promoCodeApplied ? promoCode : null);
+    // 如果有来自URL的优惠码且尚未应用，自动验证和应用
+    if (promoCodeFromUrl && promoCode && !promoCodeApplied) {
+      setValidatingPromo(true);
+      try {
+        const result = await calculatePrice(plan, selectedCycle, promoCode);
+        if (result && !result.promo_error) {
+          setPromoCodeApplied(true);
+          toast({
+            title: '优惠码已自动应用',
+            description: `节省 ¥${result.discount_amount.toFixed(2)}`,
+            status: 'success',
+            duration: 3000,
+            isClosable: true,
+          });
+        } else {
+          // 优惠码无效，清除并显示错误
+          setPromoCodeError(result?.promo_error || '优惠码无效');
+          setPromoCodeFromUrl(false);
+          await calculatePrice(plan, selectedCycle, null);
+        }
+      } catch (error) {
+        setPromoCodeError('优惠码验证失败');
+        setPromoCodeFromUrl(false);
+        await calculatePrice(plan, selectedCycle, null);
+      } finally {
+        setValidatingPromo(false);
+      }
+    } else {
+      await calculatePrice(plan, selectedCycle, promoCodeApplied ? promoCode : null);
+    }
     onOpen();
   };