use \Ceic\Api\Configuration;
use \Ceic\Api\Apis\SeriesApi;
use \Ceic\Api\Models\QueryEntities\SeriesApiQueryEntity;

$access_token = "ENTER YOUR API KEY HERE";
$config = Configuration::getDefaultConfiguration();
Configuration::setDefaultConfiguration($config);
$seriesApi = new SeriesApi();
$seriesQueryEntity = new SeriesApiQueryEntity();

$offset = 0;
$step = 100;
$seriesQueryEntity
    ->setKeyword("KEYWORD 1")
    ->setCountry(["COUNTRY CODE"])
    ->setToken($access_token)
    ->setOffset($offset)
    ->setLimit($step);
$seriesSearch = $seriesApi->searchSeriesQuery($seriesQueryEntity);
while (count($seriesSearch->getData()->getItems()) > 0) {
    var_export($seriesSearch);
    $offset += $step;
    $seriesQueryEntity->setOffset($seriesQueryEntity->getOffset() + $seriesQueryEntity->getLimit());
    $seriesSearch = $seriesApi->searchSeriesQuery($seriesQueryEntity);
}

?>