public function patchUser($id, array $fields)
    {
        $request = $this->client->patch($this->customer['url'].'/api/users/'.$id);

        $request->setAuth($this->customer['username'], $this->customer['password']);
        $request->setBody(json_encode($fields));

        $response = $request->send();

        return json_decode($response->getBody(true));
    }