delphi xe11 HTTP Authorization头传递签名信息，不知道怎么做 ?

微信支付商户API v3要求请求通过HTTP Authorization头来传递签名。 Authorization由认证类型和签名信息两个部分组成

签名已经做好了的，就是这个HTTP Authorization头传递签名，不知道怎么搞?

delphi xe10 idhttp组件,get方式发送

procedure Tfrmmain.Button72Click(Sender: TObject);
var url:string;
    resdata:TStringStream;
begin
    url:='https://api.mch.weixin.qq.com/v3/profitsharing/bills?'+
          'sub_mchid=3453524234s&bill_date=2023-01-10';
    requestStr:='WECHATPAY2-SHA256-RSA2048 '+#10+
                'mchid=3453524234s,'+
                'nonce_str='+nonce_str+','+
                'timestamp='+timestamp+','+
                'signature='+trim(memo18.Text)+','+
                'serial_no=20F06C79521t54dfg345sfAA0E077AD3F5742484';
    resdata:=TStringStream.Create('',Tencoding.UTF8);
    idhttp1.HandleRedirects:=true;
    //idhttp1.Request.Authentication 这个不知道怎么用？
    idhttp1.Request.CustomHeaders.AddValue('Authorization',requestStr);
    idhttp1.Request.ContentType:='application/json';
    idhttp1.Request.CharSet:='UTF-8';
    idhttp1.Response.ContentType:='application/json';
    IdHTTP1.Get(url,resdata);
    memo5.Text:=resdata.DataString;
end;