diff --git a/Runtime/Code/SDK/GuruSDK.IAP.cs b/Runtime/Code/SDK/GuruSDK.IAP.cs
index 305f634..39b68fd 100644
--- a/Runtime/Code/SDK/GuruSDK.IAP.cs
+++ b/Runtime/Code/SDK/GuruSDK.IAP.cs
@@ -126,33 +126,46 @@ namespace Guru
         #region Purchase
         
         private static Action<string, bool> _onPurchaseCallback;
-        
+
+        /// <summary>
+        /// 老接口, 将会被废弃
+        /// </summary>
+        /// <param name="productName"></param>
+        /// <param name="purchaseCallback"></param>
+        [Obsolete("Will be discarded in next version. Using Purchase(string productName, string category, Action<string, bool> purchaseCallback) instead.")]
+        public static void Purchase(string productName, Action<string, bool> purchaseCallback = null)
+        {
+            Purchase(productName, "", purchaseCallback);
+        }
+
         /// <summary>
         /// 购买商品, 通过商品Name
         /// </summary>
         /// <param name="productName"></param>
+        /// <param name="category"></param>
         /// <param name="purchaseCallback"></param>
-        public static void Purchase(string productName, Action<string, bool> purchaseCallback = null)
+        public static void Purchase(string productName, string category = "", Action<string, bool> purchaseCallback = null)
         {
             if (CheckIAPReady())
             {
                 _onPurchaseCallback = purchaseCallback;
-                GuruIAP.Instance.Buy(productName);
+                GuruIAP.Instance.Buy(productName, category);
             }
         }
-        
+
         /// <summary>
         /// 购买商品, 通过商品ID
         /// </summary>
         /// <param name="productId"></param>
+        /// <param name="category"></param>
         /// <param name="purchaseCallback"></param>
-        public static bool PurchaseById(string productId, Action<string, bool> purchaseCallback = null)
+        public static bool PurchaseById(string productId, string category = "", Action<string, bool> purchaseCallback = null)
         {
             var productName = GetProductInfoById(productId)?.Name ?? "";
             
             if (CheckIAPReady() && !string.IsNullOrEmpty(productName))
             {
-                Purchase(productName, purchaseCallback);
+                Purchase(productName, category, purchaseCallback);
                 return true;
             }
             return false;
@@ -162,7 +175,7 @@ namespace Guru
         /// <summary>
         /// 支付回调
         /// </summary>
-        /// <param name="productId"></param>
+        /// <param name="productName"></param>
         /// <param name="success"></param>
         private static void OnBuyEnd(string productName, bool success)
         {