src/Amadeus/Client/Struct/Fare/MasterPricer/FareOptions.php
protected function loadCurrencyOverride($currency)
    {
        if (is_string($currency) && strlen($currency) === 3) {
            $this->addPriceType(PricingTicketing::PRICETYPE_OVERRIDE_CURRENCY_CONVERSION);

            $this->conversionRate = new ConversionRate($currency);
        }
    }
protected function loadCurrencyOverride($currency)
    {
        if (is_string($currency) && strlen($currency) === 3) {
            $this->addPriceType(PricingTicketing::PRICETYPE_OVERRIDE_CURRENCY_CONVERSION);

            $this->conversionRate = new ConversionRate($currency);
        }
    }
Set currency override code if needed

@param string|null $currency