Walk through account creation or entitlement, authorized credit acquisition or grant, quote, concurrent reservation, partial execution, successful charge, cancellation, release, failed work, correction, dispute, termination, and reconciliation. Verify idempotency, tenant isolation, role permissions, meter-version history, and statement reconstruction. Ask which system owns each event and which team may change metering, package, balance, or customer language. Introduce a delayed event and confirm that correction remains explainable. Repeat the test after a meter update to prove that old statements keep their original meaning.
Review portability and continuity. Customers should know what records they can export and how open workflows are handled if a package or supplier changes. The business needs incident procedures for meter outage, stale balances, account compromise, and incorrect charging. Metrics such as reconciliation variance, disputed entries, reservation age, and unmetered work reveal control health, but they do not by themselves certify customer value or favorable economics.