public function setWhiteList($clientId, array $addresses)
	{
		$params = array(
			'for_client_id' => $clientId,
			'whitelist'     => json_encode($addresses),
		);

		// If empty, features are set for the owner client.
		if (!$params['for_client_id']) {
			unset($params['for_client_id']);
		}

		return $this->post('clients/set_whitelist', $params);
	}