请求 url:

url: https://api.mch.weixin.qq.com/sandboxnew/pay/unifiedorder

返回消息：

data :

<xml>

  <return_code><![CDATA[FAIL]]></return_code>

  <retmsg><![CDATA[(1213, 'Deadlock found when trying to get lock; try restarting transaction')]]></retmsg>

  <retcode><![CDATA[1]]></retcode>

</xml>