This is Enclosure Prefix

This URL is intended to be used as enclosure prefix in RSS file on your hosting provider.

<?xml version="1.0" ...>
<channel>
  <title>My first Podcast</title>
  ...
  <item>
    <title>My First Episode</title>
    <enclosure url="https://adbarker.com/stream/<YOUR_TOKEN>/www.mypodcasthost.com/audio_file.mp3" length="5:00" type="audio/mpeg"/>
  </item>
  ...
</channel>