微信退款通知结果回调接口，报 invalid notification, err: key `Wechatpay-Serial` is empty in header, request-id=[], 异常，我打印出了请求头所有的键值，有关验签的一个都没有，Wechatpay-Serial、Wechatpay-Signature、Wechatpay-Nonce、Wechatpay-Timestamp 这4个都没有，我就好奇，微信调起我的回调通知接口，请求头不带这些关键信息，接口还有什么用
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看你打印的是V2的退款通知的，你自己截图写的是V3
以下是我打印出的 微信调起回调接口的请求头信息
Content-Length : [1425]
Content-Type : [text/xml]
Cache-Control : [no-cache]
X-Forwarded-For : [175.24.214.208, 11.23.176.185]
Accept : [*/*]
Pragma : [no-cache]
User-Agent : [Mozilla/4.0]
X-Real-Ip : [175.24.214.208]
Connection : [close]