protected function setItemSupplier(ApiItemInterface $item, ProductInterface $product)
    {
        $supplier = null;
        $supplierName = '';
        // Get products supplier.
        if ($product->getSupplier()) {
            $supplier = $product->getSupplier();
            $supplierName = $product->getSupplier()->getName();
        }
        $item->setSupplier($supplier);
        $item->setSupplierName($supplierName);
    }