https://fraud.mch.weixin.qq.com/risk/getpublickey接口报错

请求报文

<xml>

<nonce_str>xbIEC3</nonce_str>

<sign>FBC3256236AA8F4578EE7DC0520B330C62071EBF1BCA0B9A7EC2AFEB1CABD9D8</sign>

<mch_id>150-----481</mch_id>

<sign_type>HMAC-SHA256</sign_type>

</xml> 响应报文

<xml>

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

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

</xml>