/**
* Build item additional values
* @param string $txCurrency
* @param string $txValue
* @param string $taxValue
* @param string $taxReturnBase
* @return the a map with the valid additional values
*
*/
private static function buildItemAdditionalValues($currency, $value, $taxValue, $taxReturnBase)
{
$additionalValues = null;
$additionalValues = PayUSubscriptionsRequestUtil::addAdditionalValue($additionalValues, $currency, PayUKeyMapName::ITEM_VALUE, $value);
$additionalValues = PayUSubscriptionsRequestUtil::addAdditionalValue($additionalValues, $currency, PayUKeyMapName::ITEM_TAX, $taxValue);
$additionalValues = PayUSubscriptionsRequestUtil::addAdditionalValue($additionalValues, $currency, PayUKeyMapName::ITEM_TAX_RETURN_BASE, $taxReturnBase);
return $additionalValues;
}
