use ComplyCube\ComplyCubeClient;
$ccapi = new ComplyCubeClient('<YOUR_API_KEY>');
$clients = $ccapi->clients()->list(['page' => 1, 'pageSize' => 20]);
// For documents. Similarly done for addresses, checks, live photos, etc.
$documents = $ccapi->documents()->list('CLIENT_ID',
['page' => 1, 'pageSize' => 20]);