public function getPaymentInformation($paymentType = null)
    {
        $paymentInformation = $this->_getField(self::$PAYMENT_INFORMATION);
        if (is_array($paymentInformation)) {
            if (!is_null($paymentType)) {
                $paymentType = strtoupper($paymentType);
                foreach ($paymentInformation as $singlePaymentInformation) {
                    if ($singlePaymentInformation['paymentType'] == $paymentType) {
                        return $singlePaymentInformation;
                    }
                }

                return Array();
            } else {
                return $paymentInformation;
            }
        } else {
            return Array();
        }
    }