Currency::getDefaultCurrency

static function getDefaultCurrency()
{
	if (Loader::includeModule('bitrix24') && is_array($currencies = CBitrix24::GetAvBillingCurrencies()))
	{
		$currentCurrency = current($currencies);
		return $currentCurrency !== 'RUR'? $currentCurrency : 'RUB';
	}

	if (Loader::includeModule('currency'))
	{
		return CurrencyManager::getBaseCurrency();
	}
	return false;
}