public function listProducts()
    {
        $service = $this->getService();

        $response      = $service->request('products', 'GET');
        $responseArray = $this->getResponseArray($response);

        if (!$this->isError()) {
            $this->_data = $this->_normalizeResponseArray($responseArray);
        } else {
            $this->_data = array();
        }

        return $this;
    }