Revenue Integrity — Reconciliation, Recognition, and the Metrics Finance Will Compute Anyway
The billing system's last responsibility is proving itself: that every invoice matches money that actually moved, that revenue is recognized when it's earned rather than when it's charged, and that the metrics the business runs on — MRR, churn, net revenue retention — derive from billing data by defined rules rather than by whichever spreadsheet ran last. Revenue integrity is where billing engineering meets accounting, and the systems that skip it get audited into building it retroactively.
Revenue integrity closes the series: reconciliation across billing, processor, and settlement with a short owned exception queue; revenue recognition (charging is not earning — emit service periods and linkage so deferral is computable); and MRR with movements as versioned derivations from the state machine itself.