public function getCampaignsByLogin($login)
    {
        $resource = 'campaigns/by_login/' . $login . '.json';

        $response = $this->sendRequest('GET', $this->getServiceUrl($resource));

        $decodedResponseBody = $this->getDecodedBody($response->getBody());

        $getCampaignsResponse = new Models\GetCampaignsResponse($decodedResponseBody);
        return $getCampaignsResponse->getCampaigns();
    }