This file is the explanation. The other files are the installable pieces.
It patches proxmox-widget-toolkit so checked_command runs the original action instead of popping No valid subscription.
It does not fake a subscription. It only skips the nag dialog. If you are not paying, the no-subscription repo is still the correct repo.
Tested on PVE 7.2-3 (proxmox-widget-toolkit 3.4-10). Later majors change proxmoxlib.js; if the script prints checked_command pattern not found, update the pattern.