Paid plugins over time.
WHAT A LICENCE USUALLY COVERS
Updates Support Sometimes a limited number of sites
WHAT HAPPENS WHEN IT LAPSES
The plugin keeps working Updates stop Support ends
WHY THAT MATTERS
An unupdated plugin accumulates known vulnerabilities.
WHAT TO TRACK
Which plugins are paid When each renews What each costs Which site each licence is for
WHERE TO KEEP IT
A document, with your other site records.
WHAT PEOPLE DISCOVER
Licences expired years ago on plugins still running Licences paid for plugins no longer used Nobody knowing which account holds the licence
THAT LAST ONE
If a developer bought licences on their own account, you may not control them.
Establish that before you need to.
BUDGETING
Annual renewals for the plugins you depend on.
If a renewal is not worth paying, replace the plugin rather than running it unupdated.