The app-ads.txt lines provided by your Google Ad Manager "app-ads.txt setup" page. These are written verbatim to "/app-ads.txt" so Google can verify the apps published under this domain. Never add lines from unknown sources.  Changes are reflected at the next scheduled update, or you can run "Update App-ads.txt" under <a href="admin.php?cron/">Tools > Cron Entries</a>.