protected function addPaymentFeeWithoutTax($addTaxIndationLabel = false)
    {
        if ($addTaxIndationLabel) {
            $label = $this->helper('adyen')->__('Payment Fee (Excl.Tax)');
        } else {
            $label = $this->helper('adyen')->__('Payment Fee');
        }

        $this->addTotal(
            new Varien_Object(
                array(
                    'code' => 'payment_fee_excl',
                    'strong' => false,
                    'value' => $this->getSource()->getPaymentFeeAmount(),
                    'base_value' => $this->getSource()->getBasePaymentFeeAmount(),
                    'label' => $label,
                    'area' => '',
                )
            ),
            'subtotal'
        );
    }