public function getPayPalPaymentCosts()
    {
        $amount = 0.0;

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

        return $amount;
    }