xbilling - error in frontend

[chelofarias]

Panel URL is http://artegraf.com.ar

This is my config.ph file content:

<?php
 /**
  * API connection settings for xBilling
  * Version : 1.2.0
  * @author Aderemi Adewale (modpluz @ Sentora Forums)
  * Email : goremmy@gmail.com
  * @desc This allows front-end billing package interact with the backend module
 */
                   
 // Config;
    $cfg = array();
    $cfg['api_key'] = 'MI_API_KEY';
    $cfg['panel_url'] = 'http://artegraf.com.ar';
    $cfg['zpx_uid'] = 1;
                   
    if(strpos($cfg['panel_url'], 'http') === false){
        $cfg['panel_url'] = 'http://'.$cfg['panel_url'];
    }                    
?>

The new error message:

array(4) { ["type"]=> int(2) ["message"]=> string(112) "fopen(http://artegraf.com.ar/api/xbilling): failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found " ["file"]=> string(95) "/var/sentora/hostdata/zadmin/public_html/artegraf_com_ar/registrar/classes/xmwsclient.class.php" ["line"]=> int(112) } Problem reading data from http://artegraf.com.ar/api/xbilling