Link::getSubscriptionBuy

static function getSubscriptionBuy(string $from = ''): string
{
	if ($from !== '') {
		$from = '&' . Link::$keyFrom . '=' . $from;
	}

	$result = '';
	if (ModuleManager::isModuleInstalled('bitrix24')) {
		$result = '/settings/license_buy.php?product=subscr' . $from;
	} else {
		$region = Option::get('main', '~PARAM_CLIENT_LANG', LANGUAGE_ID);

		if ($region === 'ru') {
			$result = 'https://www.1c-bitrix.ru/buy/products/b24.php?subscr=y' . $from;
		} elseif ($region === 'ua') {
			$result = 'https://www.bitrix.ua/buy/products/b24.php?subscr=y' . $from;
		}
	}

	return $result;
}