public function getPayPalGiftCardCosts()
    {
        $amount = 0.0;

        $giftCardCost = $this->getCosts('oxgiftcard');
        if ($giftCardCost) {
            $amount = $this->isCalculationModeNetto() ? $giftCardCost->getNettoPrice() : $giftCardCost->getBruttoPrice();
        }

        return $amount;
    }