update: 修复支付接口问题, 增加日志

Runtime/GuruIAP/Runtime/Code/IAPServiceBase.cs

@@ -324,17 +324,25 @@ namespace Guru
             }
         }
 
+        /// <summary>
+        /// 获取 IAP 内置商品
+        /// </summary>
+        /// <param name="productName"></param>
+        /// <returns></returns>
         public Product GetProduct(string productName)
         {
-            if (_storeController != null || _storeController.products != null)
+            if (_storeController != null && _storeController.products != null)
             {
                 var info = GetInfo(productName);
                 if (info != null)
                 {
                     return _storeController.products.WithID(info.Id);
                 }
+                Debug.LogError($"[IAP] --- can't find <ProductInfo> with name {productName}");
             }
-
+            
+            // 商品不存在则返回 NULL
+            Debug.LogError($"[IAP] --- _storeController is null or products is null or products.all.Length == 0");
             return null;
         }