Как добавить капчу к своему скрипту в CMS Битрикс

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include_once($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/classes/general/captcha.php");
$oCaptcha = new CCaptcha();
$captchaPass = COption::GetOptionString("main", "captcha_password", "");
if(strlen($captchaPass) <= 0){
    $captchaPass = randString(10);
    COption::SetOptionString("main", "captcha_password", $captchaPass);
}
$oCaptcha->SetCodeCrypt($captchaPass);

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<input name="captcha_code" value="<?=htmlspecialchars($oCaptcha->GetCodeCrypt());?>" type="hidden">
<img src="/bitrix/tools/captcha.php?captcha_code=<?=htmlspecialchars($oCaptcha->GetCodeCrypt());?>">
<input id="captcha_word" name="captcha_word" type="text">

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if($APPLICATION->CaptchaCheckCode($_POST["captcha_word"], $_POST["captcha_code"]))
{
  echo 'Верно';
}
else
{
  echo 'Ошибка!';
}