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docs(billing): document meter service as calc-agnostic #3798

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Merged
PierreBrisorgueil merged 2 commits into from
Jun 5, 2026
Merged

docs(billing): document meter service as calc-agnostic #3798

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docs(billing): document meter service as calc-agnostic; downstream co…
PierreBrisorgueil Jun 4, 2026
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docs(billing): fix spelling — scrape/op, zeroing
PierreBrisorgueil Jun 5, 2026
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6 changes: 6 additions & 0 deletions modules/billing/README.md
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Stripe-based billing with per-plan quota management and meter-based compute pricing.

## Module boundary — the meter service is calc-agnostic

`billing.meter.service.js` converts a feature-keyed **USD cost map → meter units** via config ratios (`dollarsToUnitRatio`, per-plan `ratios`) and applies config knobs (`runBase`, `maxUnitsPerOperation`). It does **not** know what a run costs.

**Downstream cost semantics — what a scrape/op costs, per-run infra base, product-specific floors/caps — live in the downstream's own cost module + config (e.g. Trawl `modules/costs`), never inline in this service.** An inline downstream patch here is silently wiped by `/update-stack`: a tier0 run-base floor added downstream inside a `billing.meter.service.js` copy was lost on the next stack sync, zeroing metering for free-tier scrapes (trawl `#1293` → `#1316`). If a behaviour must live in this service, add it as a **default-off config knob**, never a hardcoded downstream rule.

## Quota System

### Configuration
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