diff --git a/video-gen-api/app/services/payment.py b/video-gen-api/app/services/payment.py
index 49d6cf67..66dcb30d 100644
--- a/video-gen-api/app/services/payment.py
+++ b/video-gen-api/app/services/payment.py
@@ -367,7 +367,6 @@ def _get_wechat_client(
 
     try:
         from wechatpayv3 import WeChatPay, WeChatPayType
-        import os
     except ImportError:
         logger.error(
             "wechatpayv3 is not installed. "
@@ -376,17 +375,9 @@ def _get_wechat_client(
         return None
 
     try:
-        # 创建并确保微信支付证书目录存在
-        wechat_cert_dir = os.path.abspath(os.path.join(
-            os.path.dirname(os.path.dirname(__file__)), 
-            "..", 
-            "storage", 
-            "wechat_certs"
-        ))
-        os.makedirs(wechat_cert_dir, exist_ok=True)
-        logger.info("WeChat Pay platform certificates will be stored in: %s", wechat_cert_dir)
+        logger.info("Initializing WeChat Pay with cert_dir=None (no cache)")
         
-        # 初始化微信支付客户端
+        # 初始化微信支付客户端，cert_dir=None，让 SDK 在线获取证书
         _wechat_client = WeChatPay(
             wechatpay_type=WeChatPayType.NATIVE,
             mchid=mch_id,
@@ -395,7 +386,7 @@ def _get_wechat_client(
             appid=appid,
             apiv3_key=api_v3_key,
             notify_url=notify_url,
-            cert_dir=wechat_cert_dir,
+            cert_dir=None,  # 不缓存证书，每次都从微信服务器获取
         )
         _wechat_mch_id = mch_id
         logger.info("WeChat Pay client initialized successfully")