public function get($productVariantId, array $fields = array())
    {
        $params = array();
        if (!empty($fields)) {
            $params['fields'] = $fields;
        }
        $endpoint = '/admin/variants/'.$productVariantId.'.json';
        $response = $this->request($endpoint, 'GET', $params);
        return $this->createObject(ProductVariant::class, $response['variant']);
    }