我在调用微信商家转账的时候,为什么总是提示错误的签名,验签失败呢? 我的微信退款都是正常的,

这个是我请求签名的body 很疑惑啊!

{
  "transfer_scene_report_infos" : [ {
    "info_type" : "活动名称",
    "info_content" : "团长佣金提现"
  }, {
    "info_type" : "奖励说明",
    "info_content" : "业务推广佣金"
  } ],
  "transfer_amount" : 20,
  "openid" : "oejHs6y1_bptfZN4WJH2122222222222222222kzr8w",
  "appid" : "wxf431cd56222222222ae5d",
  "out_bill_no" : "456213978",
  "user_recv_perception" : "现金营销",
  "transfer_scene_id" : "1000",
  "transfer_remark" : "openId"
}


public String getToken(String method, HttpUrl url, String body) throws SignatureException, NoSuchAlgorithmException, InvalidKeyException, UnsupportedEncodingException {
    String nonceStr = WXPayUtil.generateNonceStr(); //WXPayUtil是微信支付自带的sdk
    long timestamp = System.currentTimeMillis() / 1000; //生成时间戳

    //需要加密的参数
    String canonicalUrl = url.encodedPath();
    if (url.encodedQuery() != null) {
        canonicalUrl += "?" + url.encodedQuery();
    }
    String parameter = method + "\n"
        + canonicalUrl + "\n"
        + timestamp + "\n"
        + nonceStr + "\n"
        + body + "\n";

    //对参数进行加密
    byte[] bytes = parameter.getBytes(StandardCharsets.UTF_8);
    Signature sign = Signature.getInstance("SHA256withRSA");
    PrivateKey privateKey = PemUtil.loadPrivateKeyFromPath(ConstantPropertiesUtils.PEM);  //privateKeyPath是商户证书密钥的位置apiclient_key.pem
    sign.initSign(privateKey);   //商户密钥文件路径
    sign.update(bytes);

    String signature = Base64.getEncoder().encodeToString(sign.sign());

    //获取token
    String token = "mchid=\"" + ConstantPropertiesUtils.PARTNER + "\","      //商户号
        + "nonce_str=\"" + nonceStr + "\","
        + "timestamp=\"" + timestamp + "\","
        + "serial_no=\"" + ConstantPropertiesUtils.MERCHANT + "\"," //merchantSerialNumber是微信支付中申请的证书序列号
        + "signature=\"" + signature + "\"";
    
    String schema = "WECHATPAY2-SHA256-RSA2048 "; //注意有一个空格
    return schema + token;

}

{"code":"SIGN_ERROR","detail":{"detail":{"issue":"sign not match"},"field":"signature","location":"authorization","sign_information":{"method":"POST","sign_message_length":414,"truncated_sign_message":"POST\n/v3/fund-app/mch-transfer/transfer-bills\n1737012721\na1bb4289f3e3472c8bb4a3085824218e\n{\"transf\n","url":"/v3/fund-app/mch-transfer/transfer-bills"}},"message":"错误的签名，验签失败"}