Metered features are priced based on your usage. When a site’s usage of a metered feature reaches the limit of the current level, it triggers an automatic upgrade to the next level, or purchase of an extra usage package.
With metered features, some usage thresholds trigger an automatic upgrade to the next level, and others trigger purchase of an extra usage package.
Extra usage packages increase your allowance for all metered features in the package — including ones that are still below their limit.
For more information on usage, visit our Billing docs.