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...
        Params.Add('MfcISAPICommand=SignInWelcome');
        Params.text:=Params.text + 'a1%3Dna~a2%3Dna~a3%3Dna~a4%3DMozilla~a5%3D' + 'Netscape~a6%3D5.0%20(Windows%3B%20de)~a7%3D20090715~a8%3Dna~a9%3Dtrue~a10%3DWindows%20NT%206.0~a11%3Dtrue~a12%3DWin32~a13%3Dn' + 'a~a14%3DMozilla%2F5.0%20(Windows%3B%20U%3B%20Windows%20NT%206.0%3B%20de%3B%20rv%3A1.9.1.1)%20Gecko%2F20090715%20' + 'Firefox%2F3.5.1~a15%3Dtrue~a16%3Dde~a17%3Dna~a18%3Dsignin.ebay.de~a19%3Dna~a20%3Dna~a21%3Dna~a22%3Dna~a23%3D1680~a24%3D10' + '50~a25%3D32~a26%3D1020~a27%3Dna~a28%3DTue%20Jul%2021%202009%2017%3A04%3A13%20GMT%2B0200~a29%3D2~a30%3Ddef%7Cqt6%7Cqt5%7Cqt4%7Cqt3%7Cqt2%7Cqt1%7Cpdf' + '%7Cmso%7Cswf%7C~a31%3Dyes~a32%3Dna~a33%3Dna~a34%3Dno~a35%3Dno~a36%3Dyes~a37%3Dno~a38%3Donline~a39%3Dno~a40%3DWindows%20NT%206.0~a41%3Dno~a42%3Dno~a43%3D';  //musste den string in mehrere substrings aufteilen, da er du lang war
        Params.Add('inputversion=2');
        Params.Add('lse=true');
        Params.Add('lsv=10.0.22');
        Params.Add('mid=AQAAASJINcJdAAUxMjI2NGMwNGJiNy5hMDkwYjczLjc4MjA3LmZmZmZhNjNhADiP0v8hOAsKF2E%2BWA38MVbzj8k*');
        Params.Add('kgver=1');
        Params.Add('kgupg=1');
        Params.Add('kgstate=r');
        Params.Add('omid=');
        Params.Add('hmid=AQAAASJINcJdAAU2NGMwNTU4ZjEyMjBhMDZjMjE2MDVmYzBmZmU1Y2I0YiwwLC0x82UUzbPa7XWixDDVYkW%2Fdqn1cns*');
        Params.Add('siteid=77');
        Params.Add('co_partnerId=2');
        Params.Add('UsingSSL=1');
        Params.Add('ru=');
        Params.Add('pp=');
        Params.Add('pa1=');
        Params.Add('pa2=');
        Params.Add('pa3=');
        Params.Add('i1=-1');
        Params.Add('pageType=-1');
        Params.Add('rtmData=A01=AEABtISBEAAAAAAAQCIEqv9sAMSIs7yMvkojwiPBJ+Qk5LBL/CRiBo4HQSSAKlGksJg4JAK;M01=AIAAHKAIAAMoQBBgAQcABGEYQAkAG;TC01=QEguYX3pIBAAAQQLiUABAAAAAAAkACECVAA/2zSoAjECAC2dZAAMzLJg0RYJUfCSA5DRGAyXCWAEnfhIAJGgCY/ASAlEgC4SDSAtJgIAJnAoAG;PS=T.0');
        Params.Add('userid=' + Memo1.Lines[i]);
        Params.Add('pass=' + Memo2.Lines[i]);
        HTMLCode:=IdHTTP1.Get('https://signin.ebay.de/ws/eBayISAPI.dll?co_partnerid=2&siteid=77&UsingSSL=1');
        Params.Add('kgct=' + readout(HTMLCode, '</table><input type="Hidden" name="kgct" value="', '"></td>'));

         IdHTTP1.Request.Referer := 'https://signin.ebay.de/ws/eBayISAPI.dll?SignIn';
         IdHTTP1.Request.Host := 'signin.ebay.de';
         IdHTTP1.Request.ContentType := 'application/x-www-form-urlencoded';

         HTMLCode:=IdHTTP1.Post('https://signin.ebay.de/ws/eBayISAPI.dll?co_partnerid=2&siteid=77&UsingSSL=1', Params);

         IdHTTP1.Request.Referer := '';
         IdHTTP1.Request.Host := '';
         IdHTTP1.Request.ContentType := '';					

1:

<meta http-equiv="Refresh" content="0; url = http://my.ebay.de/ws/eBayISAPI.dll?MyeBay">