调用https://api.mch.weixin.qq.com/sandboxnew/pay/orderquery

orderid='cf5a799b57ff41f7af3f118d1f2bda8b' 订单已支付，沙盒环境

返回如下

 respXml=<xml>

  <sub_mch_id><![CDATA[]]></sub_mch_id>

  <nonce_str><![CDATA[eL8m2pGbreAi9rpa5oVUNdI4XCWvE5yf]]></nonce_str>

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

  <err_code_des><![CDATA[订单不存在]]></err_code_des>

  <sign><![CDATA[81A82A2779AC4002F8B9456E4D7C1752]]></sign>

  <mch_id><![CDATA[]]></mch_id>

  <return_msg><![CDATA[OK]]></return_msg>

  <appid><![CDATA[]]></appid>

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

  <err_code><![CDATA[ORDERNOTEXIST]]></err_code>

</xml>