我用nodejs搭建的后台，在调用微信企业付款时报“xml解析错误”，求大神解决啊！
请求参数：
<xml><mch_appid>xxxxxxxx</mch_appid><desc>提现</desc>
<mchid>xxxxxxxxxxxxx</mchid>
<nonce_str>U7W4VAYT0LYHXFSZLBEB1PBE9V1UCC13</nonce_str><notify_url>http://xxxxxxxxxxx.com&lt;/notify_url>
<openid>xxxxxxxxxxxxxx</openid><partner_trade_no>LCVRM74N1557636034118</partner_trade_no><spbill_create_ip>127.0.0.1</spbill_create_ip><amount>1</amount><check_name>NO_CHECK</check_name><re_user_name>xxx</re_user_name><sign>C7C01FC16EE94CE2A416A4C939953834</sign></xml>

请求：options = {

    url: 'https://api.mch.weixin.qq.com/mmpaymkttransfers/promotion/transfers',
    method: "POST",
    json: true,
    headers: {
        "content-type": "application/json;charset=utf-8"
    },
    body: formData,
    key: fs.readFileSync('../server/common/file/wxpay/apiclient_key.pem'), //将微信生成的证书放入 cert目录下
    cert: fs.readFileSync('../server/common/file/wxpay/apiclient_cert.pem')
};

返回结果：
return_code: [ 'SUCCESS' ],
return_msg: [ 'XML解析错误' ],
result_code: [ 'FAIL' ],
err_code: [ 'XML_ERROR' ],
err_code_des: [ 'XML解析错误' ]

求大神解决啊！