Fonts Plugin Pro License Key
When you purchase Fonts Plugin Pro your license key will be included at the bottom of your receipt email.
Subject: Fonts Plugin Pro Purchase
Once you have logged in, click 'View Licenses' and then 'Manage Sites'.
If you have already activated a site it will be shown here. Otherwise it will look like this:
To add your license key to your website, navigate to wp-admin → Fonts Plugin → License.