TitanWM

I dont know and I dont use WP (or wp chaturbate plugin). You must find the code where the link is for XML-url and change it to a local path (where you store the XML file).

Update the XML file every 5 minutes (cronjob). You can update your local XML file with this PHP code:

<?php
$update = "PathToTheXmlFile/XmlFile.xml";

$url = "http://chaturbate.com/affiliates/api/onlinerooms/?format=xml&wm=YourAffId";
$xml = file_get_contents($url);

if(!empty($xml)) {
file_put_contents($update,$xml);
} else {
echo "Did not get a file back<br>\n";
}
?>

Now you need a cronjob on your server to execute this php file every 5 minutes.

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