curl --location --request POST '/pay/downloadfundflow' \
--header 'Content-Type: application/xml' \
--data-raw '<xml>
<appid>wx2421b1c4370ec43b</appid>
<bill_date>20141110</bill_date>
<account_type>Basic</account_type>
<mch_id>10000100</mch_id>
<nonce_str>21df7dc9cd8616b56919f20d9f679233</nonce_str>
<sign>332F17B766FC787203EBE9D6E40457A1</sign>
</xml>'
<xml>
<return_code>
<![CDATA[SUCCESS]]>
</return_code>
<return_msg>
<![CDATA[OK]]>
</return_msg>
<result_code>
<![CDATA[FAIL]]>
</result_code>
<err_code>
<![CDATA[NO_BILL_EXIST]]>
</err_code>
<err_code_des>
<![CDATA[商户查询账户当日无资金账单]]>
</err_code_des>
</xml>