List of unpaid invoices.
Billing history item identifier.
The billing item action.
The amount associated with this billing item.
The amount remaining to pay.
The currency of the billing item.
The billing item description.
The external invoice identifier.
URL to the hosted invoice.
The associated invoice identifier.
When the billing event occurred.
The associated receipt identifier.
The source of the billing item.
The source invoice identifier.
The status of the billing item.
The billing item type.
