Usage
Usage types are categories of usage-based services, such as cell phone minute usage or email storage, you offer your customers via plans or subscriptions in your product catalog. Aria bills your customers in arrears for usage-based services based on their measured consumption, during a usage billing interval you specify during plan creation, of that service that you report via API calls.
Note: Usage is typically not included on the first invoice. If you plan to load usage records into Aria before Aria generates your customer's first invoice, you should set the Invoicing client parameter Include Usage Charges on First Invoice to "True."