<?php ini_set('display_errors', 1); error_reporting(E_ALL); require_once 'CMBase.php'; //-----------------------------INPUT PARAMS--------------------------------------- $apikey = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'; $listid = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'; $title = 'Updated API Created List'; $unsubscribePage = ''; $confirmOptIn = 'false'; $confirmationSuccessPage = ''; //------------------------------------------------------------------------------- $cm = new CampaignMonitor($apikey); //Optional statement to include debugging information in the result $cm->debug_level = 1; //This is the actual call to the method $result = $cm->listUpdate($listid, $title, $unsubscribePage, $confirmOptIn, $confirmationSuccessPage); echo '<br><br>'; print_r($result);