<?php require_once '../../csrest_lists.php'; $wrap = new CS_REST_Lists('List ID', 'Your API Key'); $result = $wrap->update_field_options('[CustomFieldKey]', array('Option 1', 'Option 2'), true); echo "Result of PUT /api/v3/lists/{ID}/customfields/{fieldkey}/options\n<br />"; if ($result->was_successful()) { echo "Updated with code\n<br />" . $result->http_status_code; } else { echo 'Failed with code ' . $result->http_status_code . "\n<br /><pre>"; var_dump($result->response); echo '</pre>'; }