private function addRequestPaymentComment($paypalOrderPayment)
    {
        $request = $this->getRequest();
        $memo    = $request->getRequestParameter(self::PAYPAL_IPN_MEMO);

        if ($memo) {
            $comment = oxNew(\OxidEsales\PayPalModule\Model\OrderPaymentComment::class);
            $comment->setComment($memo);
            $paypalOrderPayment->addComment($comment);
            if (0 < $paypalOrderPayment->getId()) {
                $paypalOrderPayment->save();
            }
        }
        return $paypalOrderPayment;
    }