diff --git a/internal/logic/public/iap/apple/attachTransactionLogic.go b/internal/logic/public/iap/apple/attachTransactionLogic.go
index 614df2c..6d61e5e 100644
--- a/internal/logic/public/iap/apple/attachTransactionLogic.go
+++ b/internal/logic/public/iap/apple/attachTransactionLogic.go
@@ -59,12 +59,26 @@ func (l *AttachTransactionLogic) Attach(req *types.AttachAppleTransactionRequest
 		tier = m.Tier
 		subscribeId = m.SubscribeId
 	} else {
-		if req.DurationDays <= 0 || req.SubscribeId <= 0 {
+		// fallback from order_no if provided
+		if req.OrderNo != "" {
+			if ord, e := l.svcCtx.OrderModel.FindOneByOrderNo(l.ctx, req.OrderNo); e == nil && ord != nil && ord.Id != 0 {
+				duration = ord.Quantity
+				subscribeId = ord.SubscribeId
+			}
+		}
+		// final fallback: use request fields
+		if duration <= 0 {
+			duration = req.DurationDays
+		}
+		if tier == "" {
+			tier = req.Tier
+		}
+		if subscribeId <= 0 {
+			subscribeId = req.SubscribeId
+		}
+		if duration <= 0 || subscribeId <= 0 {
 			return nil, errors.Wrapf(xerr.NewErrCode(xerr.ERROR), "unknown product")
 		}
-		duration = req.DurationDays
-		tier = req.Tier
-		subscribeId = req.SubscribeId
 	}
 	exp := iapapple.CalcExpire(txPayload.PurchaseDate, duration)
 	sum := sha256.Sum256([]byte(req.SignedTransactionJWS))