The problem
Pricing wants to evolve — seats, usage, credits, enterprise contracts — but billing was hard-coded for the first model. Every pricing experiment becomes an engineering project with revenue-corrupting failure modes.
The system
A billing layer with an event-based metering pipeline (idempotent, replayable), a rating engine that turns usage into charges from configuration, proration and plan-change logic that finance signs off on, and dunning flows that recover failed payments politely and persistently.
How it's built
- Usage events with exactly-once aggregation; backfill-safe by design
- Rating/pricing as configuration; effective-dated plan changes
- Invoice generation with tax hooks; ledger-grade audit trail
- Dunning: retries, reminders, grace states — recovered revenue measured
Delivery
Build engagement alongside your existing PSP; typically 8–10 weeks to first production invoices on the new engine.
What to expect
- Pricing changes ship as config reviews, not quarter-long projects
- Metered revenue reconciles to raw events — provably
- Involuntary churn reduced by systematic dunning