public function getAuth(CardPayments\Authorization $auth)
    {
        $auth->setRequiredFields(array('id'));
        $auth->checkRequiredFields();

        $request = new Request(array(
             'method' => Request::GET,
             'uri' => $this->prepareURI("/auths/" . $auth->id)
        ));

        $response = $this->client->processRequest($request);
        return new CardPayments\Authorization($response);
    }