Build a calendar from the actual contract: delivery, update, statement, invoice, payment, audit, renewal and notice dates. Reconcile the first statement against the agreed calculation before treating the reporting process as operationally proven.
Maintain an exceptions register covering missing data, unexplained deductions, late payments, use changes, onward access and delivery failures. An exception is a question to investigate; it is not automatically evidence of underpayment or breach.
For renewals, compare actual receipts and support effort against the original scenarios. Review any expansion of uses, customers or content as a fresh decision. Document retention, deletion, continued model use and other surviving obligations individually rather than assuming contract expiry reverses every technical consequence.