diff --git a/sdk-intergration/Packages/tysdk/Runtime/TYSDKCallbackManager.cs b/sdk-intergration/Packages/tysdk/Runtime/TYSDKCallbackManager.cs
index 80c948e..0e82232 100644
--- a/sdk-intergration/Packages/tysdk/Runtime/TYSDKCallbackManager.cs
+++ b/sdk-intergration/Packages/tysdk/Runtime/TYSDKCallbackManager.cs
@@ -71,6 +71,49 @@ namespace tysdk
             return tcs.Task;
         }
 
+        /// <summary>
+        /// 重置已注册 callback 的超时时间：取消先前安排的延时 <see cref="CancellationTokenSource.Cancel"/>,
+        /// 并从<strong>当前时刻</strong>起在 <paramref name="newTimeout"/> 后触发取消（与构造时传入的延时等价，见 <see cref="CancellationTokenSource.CancelAfter(System.TimeSpan)"/>）。
+        /// </summary>
+        /// <typeparam name="T">Callback 数据类型</typeparam>
+        /// <param name="newTimeout">新的超时时间；若需立即按超时处理可使用 <see cref="TimeSpan.Zero"/></param>
+        /// <returns>找到未完成 pending 并成功重置则为 true</returns>
+        public bool ResetCallbackTimeout<T>(TimeSpan newTimeout) where T : class
+        {
+            if (_disposed)
+                throw new ObjectDisposedException(nameof(TYSDKCallbackManager));
+
+            var callbackId = typeof(T).Name;
+
+            if (!_callbacks.TryGetValue(callbackId, out var entry))
+            {
+                UnityEngine.Debug.LogWarning($"[TYSDKCallbackManager] No pending callback found for type: {callbackId}");
+                return false;
+            }
+
+            if (entry.Task.IsCompleted)
+            {
+                UnityEngine.Debug.LogWarning($"[TYSDKCallbackManager] Callback {callbackId} already completed, cannot reset timeout");
+                return false;
+            }
+
+            var cts = entry.CancellationTokenSource;
+            if (cts == null)
+                return false;
+
+            try
+            {
+                cts.CancelAfter(newTimeout);
+                UnityEngine.Debug.Log($"[TYSDKCallbackManager] Reset timeout for {callbackId} to {newTimeout.TotalSeconds}s");
+                return true;
+            }
+            catch (ObjectDisposedException)
+            {
+                UnityEngine.Debug.LogWarning($"[TYSDKCallbackManager] CancellationTokenSource already disposed for {callbackId}");
+                return false;
+            }
+        }
+
         /// <summary>
         /// 触发callback
         /// </summary>
diff --git a/sdk-intergration/Packages/tysdk/Runtime/TYSdkFacade_Pay.cs b/sdk-intergration/Packages/tysdk/Runtime/TYSdkFacade_Pay.cs
index 895a370..3e14a70 100644
--- a/sdk-intergration/Packages/tysdk/Runtime/TYSdkFacade_Pay.cs
+++ b/sdk-intergration/Packages/tysdk/Runtime/TYSdkFacade_Pay.cs
@@ -20,6 +20,8 @@ namespace tysdk
                               |___/                          
         =================================================*/
 
+        private bool _payFirstNegativeHandled;
+
         //public async Task<PaymentInfo> Pay(string prodId, string prodPrice, string prodName, int count, string pType, string price_amount_micros =null)
         public async Task<PaymentInfo> Pay(SKUDetail prod, int count, float usdprice, JObject purchaseInfo)
         {
@@ -76,6 +78,10 @@ namespace tysdk
               Debug.LogWarning($"[TYSdkFacade::Pay] Faild {e.Message}");
               return new PaymentInfo(){code = "-1"};
             }
+            finally
+            {
+                _payFirstNegativeHandled = false;
+            }
 
 
 #elif UNITY_IOS
@@ -95,6 +101,10 @@ namespace tysdk
                 Debug.LogWarning($"[TYSdkFacade::Pay] Faild {e.Message}");
                 return new PaymentInfo(){code = "-1"};
             }
+            finally
+            {
+                _payFirstNegativeHandled = false;
+            }
 #endif
         }
 
@@ -108,7 +118,16 @@ namespace tysdk
             result.msg = jresult["errStr"].ToString();
             if(result.code == "-1")
             {
-                Debug.Log("[TYSdkFacade] pay failed:  waiting next pay callback");
+                if (!_payFirstNegativeHandled)
+                {
+                    _payFirstNegativeHandled = true;
+                    TYSDKCallbackManager.Instance.ResetCallbackTimeout<PaymentInfo>(TimeSpan.FromSeconds(5));
+                    Debug.Log("[TYSdkFacade] pay failed (first time): reset timeout to 5s, waiting next pay callback");
+                }
+                else
+                {
+                    Debug.Log("[TYSdkFacade] pay failed: waiting next pay callback");
+                }
                 return;
             }
             TYSDKCallbackManager.Instance.TryTriggerCallback(result);