public function getBasket()
    {
        if (is_null($this->basket)) {
            /** @var \OxidEsales\PayPalModule\Core\Exception\PayPalMissingParameterException $exception */
            $exception = oxNew(\OxidEsales\PayPalModule\Core\Exception\PayPalMissingParameterException::class);
            throw $exception;
        }

        return $this->basket;
    }