When you purchase and activate a subscription license for WatchGuard Cloud products, the license is automatically added to your WatchGuard Cloud account.
After you activate a subscription license, you can add any number of users or endpoints to your account and your managed accounts. Managed accounts can now add any number of users or endpoints to their account. You can limit the maximum number of users or endpoints for an account. For more information, go to the appropriate help topic:
Subscription Billing
With a subscription license, you receive an invoice monthly. On the first of each month, WatchGuard Cloud calculates the prorated subscription usage for each product for the previous month from your account and your managed accounts. This is the number of subscription users or endpoints you are invoiced for.