【请求数据】：<xml>

  <sign>AAA909C3BDA5CF4D1B859E9BEE2072C94C3FC8BC1D8B7E130859625398207760</sign>

  <sign_type>HMAC-SHA256</sign_type>

  <combine_appid>wxceac96733a5f0c77</combine_appid>

  <combine_mch_id>1544564361</combine_mch_id>

  <device_info>test</device_info>

  <nonce_str>1571887469061</nonce_str>

  <combine_out_trade_no>9bd94819-2588-401c-83a8-06baec5d</combine_out_trade_no>

  <spbill_create_ip>192.168.10.107</spbill_create_ip>

  <time_start>20191024112429</time_start>

  <time_expire>20191024113929</time_expire>

 http://api-test.insuresmart.com.cn/v2/gateway/insureWechat.wechat.unifiedOrder.payNotify/v1

  <trade_type>JSAPI</trade_type>

  <combine_openid>os_Dg0uIp8hx0x3qNTfpPYmfaZ7w</combine_openid>

  <sub_order_list>&lt;![CDATA[{"order_num":3,"order_list":[{"appid":"wxceac96733a5f0c77","attach":"药费","body":"药费","fee_type":"CNY","mch_id":"1552398041","out_trade_no":"4ac4c7e8-7a08-4038-af3f-178f520e","total_fee":1},{"appid":"wxceac96733a5f0c77","attach":"服务费","body":"服务费","fee_type":"CNY","mch_id":"1544564361","out_trade_no":"6cc6278e-c584-44ec-8027-f01b41e0","total_fee":1},{"appid":"wxceac96733a5f0c77","attach":"保费","body":"保险费","fee_type":"CNY","mch_id":"1437788202","out_trade_no":"cb4a8411-c3a7-462b-bf74-e354a8a2","total_fee":1}]}]&gt;</sub_order_list>

</xml>

【响应数据】：<xml><return_code><![CDATA[FAIL]]></return_code>

<return_msg><![CDATA[System Error]]></return_msg>

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

<err_code_des><![CDATA[some params type maybe misused.]]></err_code_des>

</xml>

sub_order_list中的数据对<>进行了转译 ，如果不转译则会报下面的错误:

【请求数据】：<xml>

<sign>583703EB1C869BC611D22ABE95BF9F37E2BB9879B424DBB8B2777109E52C8634</sign>

  <sign_type>HMAC-SHA256</sign_type>

  <combine_appid>wxceac96733a5f0c77</combine_appid>

  <nonce_str>1571829755923</nonce_str>

  <combine_out_trade_no>8adda788-06c1-4ee1-a795-ad4c5e44</combine_out_trade_no>

  <spbill_create_ip>192.168.10.107</spbill_create_ip>

  <time_start>20191023192235</time_start>

  <time_expire>20191023193735</time_expire>

 <notify_url>http://api-test.insuresmart.com.cn/v2/gateway/insureWechat.wechat.unifiedOrder.payNotify/v1</notify_url>

  <trade_type>JSAPI</trade_type>

  <combine_openid>os_Dg0uIp8hx0x3qNTfpPYmfaZ7w</combine_openid>  <sub_order_list><![CDATA[{"order_num":3,"order_list":[{"appid":"wxceac96733a5f0c77","attach":"药费","body":"药费","fee_type":"CNY","mch_id":"1552398041","out_trade_no":"46216def-0a88-4b80-963d-a69b5ba1","total_fee":1},{"appid":"wxceac96733a5f0c77","attach":"服务费","body":"服务费","fee_type":"CNY","mch_id":"1544564361","out_trade_no":"f490fcb3-6236-4ea7-9e68-64cf8a8f","total_fee":1},{"appid":"wxceac96733a5f0c77","attach":"保费","body":"保险费","fee_type":"CNY","mch_id":"1437788202","out_trade_no":"6aa45636-4cc7-4065-a05a-01ba3a7c","total_fee":1}]}]></sub_order_list>

</xml>

【响应数据】：<xml><return_code><![CDATA[FAIL]]></return_code>

<return_msg><![CDATA[System Error]]></return_msg>

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

<err_code_des><![CDATA[xml format error.]]></err_code_des>

</xml>