function withdrawBitcoin()
{
    check_verified();
    $_POST['is_international'] = 0;
    unset($_POST['voucher']);
    do_withdraw(post('amount'), "BTC", $voucher_code, $reqid);
    return array("status" => "OK", "reqid" => $reqid);
}
function withdrawVoucher()
{
    check_verified();
    $_POST['is_international'] = 0;
    $_POST['voucher'] = 1;
    do_withdraw(post('amount'), post('currency'), $voucher_code, $reqid);
    return array("status" => "OK", "voucher" => $voucher_code, "reqid" => $reqid);
}