EventHandler::getTelegramUserCode

static function getTelegramUserCode(): ?string
{
	$telegramUserCode = null;

	$session = Main\Application::getInstance()->getSession();
	if ($session->isAccessible() && $session->has(self::TELEGRAM_USER_CODE))
	{
		$telegramUserCode = (string)$session->get(self::TELEGRAM_USER_CODE);
	}

	return $telegramUserCode;
}