It is important to clarify from the outset that “prova.app-monster.com” is not an official or legitimate IPTV service provider. Domains like app-monster.com (and its subdomains like prova.app-monster.com) are frequently used in:

(Never run such commands for URLs you don’t trust or own.)

However, for educational and informational purposes — and to help users understand what to look for if they encounter such a URL — this article explains:

Paste the full M3U URL (the one containing your username and password) into the box.

Example search that leads to such links:

Steps: Open your app, select "Add User" or "Xtream Codes API," and enter these details to download your channel list automatically. 2. Using M3U Playlist Links