PShopWs.php

#file vendor/kusflo/prestashop-webservice/src/Entities/PShopWs.php

    protected function get($options = null)
    {
        $response = $this->client->request('GET', $this->getValidUrl($options), [
            'headers' => [
                'auth' => [$this->key]
            ]
        ]);
        PShopWsException::checkStatusCode($response->getStatusCode());

        return $this->parseXML($response->getBody());
    }