Store license keys in a secure password manager (e.g., 1Password, LastPass) alongside the site credentials. Include the expiration date in the notes to prevent lapses in security coverage.
Jetpack has transitioned from individual à la carte features to bundled plans. Understanding which license applies to a specific site is the first step in management. jetpack license key
If you manage multiple sites via WP-CLI: Store license keys in a secure password manager (e
wp jetpack start_connection --url=your-site.com
wp jetpack set_license_key key_here
wp jetpack disconnect blog
wp jetpack connect --url=your-site.com --user=admin