public function getLoginsByCampaign()
    {
        $resource = 'campaigns/' . $this->campaignId . '/logins.json';

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

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

        return StringCollection::init($decodedResponseBody['logins']);
    }