Invoicing
Consolidated invoicing
Combining charges from several subscriptions, entities or products onto a single invoice per customer.
Consolidated invoicing puts everything a customer owes for a period onto one document, rather than one invoice per subscription.
Large customers usually ask for it, because their accounts payable process is per-invoice and ten invoices is ten approvals. It requires a common cycle date, a decision about how to group (per legal entity, per cost centre, per purchase order), and tax applied per line rather than per document, since consolidated lines may span jurisdictions.
The opposite is also a legitimate requirement: some customers need separate invoices per department precisely so they can be approved separately. A billing system should do both without a rebuild.