请求:
<xml>
<appid>wxca9aa15c0f2a2882</appid>
<mch_id>1617537082</mch_id>
<out_refund_no>wxrf2022030717375911588</out_refund_no>
<out_trade_no>wx2022030717354667528</out_trade_no>
<refund_fee>38</refund_fee>
<total_fee>100</total_fee>
</xml>
响应:
<xml>
<return_code><![CDATA[SUCCESS]]></return_code>
<return_msg><![CDATA[OK]]></return_msg>
<appid><![CDATA[wxca9aa15c0f2a2882]]></appid>
<mch_id><![CDATA[1617537082]]></mch_id>
<result_code><![CDATA[FAIL]]></result_code>
<err_code><![CDATA[INVALID_REQUEST]]></err_code>
<err_code_des><![CDATA[refund_fee大于可退金额]]></err_code_des>
</xml>