As a user, I want to see the invoices that will be issued at the end of the billing period.

Users can retrieve the customer's current usage (i.e. usage that will be billed at the end of the current period). However, this information doesn't include subscription fees, coupons, prepaid credits and credit note credits.

Upcoming invoices should be visible in the user interface and could be retrieved via API, so that this information could be displayed to customers.