private function getTaxClasses($locale)
    {
        $itemManager = $this->get('sulu_sales_core.item_manager');
        /** @var TaxClass[] $taxClasses */
        $taxClasses = $this->get('sulu_product.tax_class_repository')->findAll();

        $result = [];

        foreach ($taxClasses as $taxClass) {
            $result[] = [
                'id' => $taxClass->getId(),
                'name' => $taxClass->getTranslation($locale)->getName(),
                'tax' => $itemManager->retrieveTaxForClass($taxClass)
            ];
        }

        return $result;
    }