feat(billing): subscription billing with usage metering - #989
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) Adds plans with recurring base fees and included usage allowances, idempotent usage-event ingestion, graduated/flat overage pricing, invoice generation with itemized base and metered lines, period rollover that resets counters, and cancel-at-period-end handling. 🤖 Generated with Codebuff Co-Authored-By: Codebuff <noreply@codebuff.com>
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Summary
Closes #914.
Adds subscription plans with a recurring base price and included usage allowance, plus metered overage billed per billing period.
What changed
backend/src/services/subscription-billing.ts—SubscriptionBillingService: plans (flat or graduatedtiers), subscriptions with optional trials, idempotent usage events, usage summaries, invoice generation with itemized base + metered lines, period rollover that resets counters, and cancel-at-period-end.backend/src/routes/subscription-billing.ts— REST API mounted at/api/v1/billing(plans, subscriptions, usage, invoices).backend/src/index.ts— router registration.docs/SUBSCRIPTION_USAGE_BILLING.md— feature documentation including pricing rules.Behaviour notes
overageUnitPriceor progressively throughtiers, with usage past the last tier falling back to the flat rate.idempotencyKeyreturns the original event instead of double-counting.close-periodinvoices the period, rolls the subscription forward and clears usage.Tests
backend/src/services/__tests__/subscription-billing.test.ts— 24 tests covering plan validation, subscription/trial creation, aggregation, idempotency, flat and graduated overage math, invoices, period rollover, and transitions. All passing; typecheck and lint clean for the new files.Verification