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Contributing to Grida | Billing

Setup guide for contributors working on the billing surface. Two clouds to wire:

  • Stripe — subscription + payment processing.
  • Metronome — AI credit ledger (top-up, auto-reload, usage gate). Charges flow through Stripe under the hood; Metronome owns balance, drain order, and the entitlement decision the AI seam reads.

Every contributor uses their own free Stripe + Metronome test/sandbox accounts. We don't share credentials. Live keys are refused at boot.

What you need​

  • Local Supabase running (supabase start).
  • A free Stripe test mode account.
  • The Stripe CLI: brew install stripe/stripe-cli/stripe.
  • A Metronome sandbox account + API token. Sign up at metronome.com.
  • cloudflared for the Metronome webhook tunnel: brew install cloudflared.
  • Node 24 + pnpm (covered by repo-wide setup).

Setup​

1. Local Supabase​

supabase start
supabase db reset

2. Stripe — test key​

Stripe Dashboard → Test mode → Developers → API keys. Copy the secret key (sk_test_…).

3. Metronome — sandbox token​

Metronome Dashboard → Connections → API tokens & webhooks → create a sandbox token.

4. Secrets in editor/.env.test.local​

.env.test holds committed defaults; .env.test.local is gitignored.

supabase status -o env | grep SUPABASE_SECRET_KEY >> editor/.env.test.local
echo 'STRIPE_SECRET_KEY=sk_test_...'   >> editor/.env.test.local
echo 'METRONOME_API_TOKEN=...'         >> editor/.env.test.local
# STRIPE_WEBHOOK_SECRET / METRONOME_WEBHOOK_SECRET / WEBHOOK_TUNNEL_HOSTNAME — added below

5. Provision substrates​

pnpm tsx editor/scripts/billing/cli.ts setup:stripe
pnpm tsx editor/scripts/billing/cli.ts setup:metronome

Both idempotent. Re-run after every supabase db reset. Stripe writes price IDs into the catalog; Metronome creates the rate card / products / billable metric.

The CLI is the single entry point for every billing script — run it without arguments to see all subcommands.

6. Stripe webhooks (local forwarding)​

In a dedicated terminal kept open during development:

stripe listen --forward-to localhost:3000/webhooks/stripe

Copy the printed whsec_… into STRIPE_WEBHOOK_SECRET. Per-stripe listen session — restart resets it.

7. Metronome webhooks (cloudflared tunnel)​

The Stripe CLI can forward to localhost; Metronome can't — it requires a public HTTPS endpoint. Use a Cloudflare named tunnel configured locally to forward /webhooks/* only. Nothing about the tunnel is git-tracked — the config lives in your ~/.cloudflared/ directory and the hostname is one of yours.

One-time setup (~5 min):

brew install cloudflared
cloudflared tunnel login                                 # browser → pick a Cloudflare zone you control
cloudflared tunnel create grida-webhooks
cloudflared tunnel route dns grida-webhooks <hostname>   # e.g. metronome-dev.yourdomain.co

Create ~/.cloudflared/grida-webhooks.yml (path filter is the security boundary — see SECURITY.md GRIDA-SEC-001):

tunnel: grida-webhooks
ingress:
  - hostname: metronome-dev.yourdomain.co
    path: ^/webhooks/.*$
    service: http://localhost:3000
  - service: http_status:404

Run it in a dedicated terminal:

cloudflared tunnel --config ~/.cloudflared/grida-webhooks.yml run

Add the hostname to .env.test.local:

WEBHOOK_TUNNEL_HOSTNAME=metronome-dev.yourdomain.co

8. Metronome webhook destination​

Metronome Dashboard → Webhooks → Add endpoint:

  • URL: https://<WEBHOOK_TUNNEL_HOSTNAME>/webhooks/metronome
  • Copy the generated signing secret → METRONOME_WEBHOOK_SECRET in .env.test.local.

9. Run + try the flow​

pnpm dev --filter=editor

Sign in as insider@grida.co / password. Two flows to try:

  • Subscription: Org settings → Billing → Upgrade. Test card 4242 4242 4242 4242, any future expiry / CVC.
  • AI credit: Same page, "Grida AI Credit" section → Buy Credit. The first top-up bootstraps the Stripe customer if needed.

The insiders QA harness at /insiders/billing exercises every primitive (top-up, complimentary commit, auto-reload, alerts, ingest) directly.

E2E suite​

Three integration tests against your real Stripe sandbox. Refuses to start unless every channel is demonstrably test-mode.

pnpm --filter editor vitest run lib/billing/__tests__/e2e

See the suite's own README for the contract.

Stable surface​

  • DB schema: grida_billing.* — locked, not REST-exposed. Public reads via v_billing_* views; writes only via fn_billing_* RPCs.
  • Stripe projector: public.fn_billing_apply_stripe_event — only place subscription state mutates.
  • Metronome projector: public.fn_billing_apply_metronome_event — credit / alert / payment_gate events.
  • Webhook paths: /webhooks/stripe, /webhooks/metronome. Both signature-verified.
  • Service module: editor/lib/billing/metronome.ts — provisionOrg, addStripeChargedCommit, setAutoReload, getEntitlement, ingestUsageEvent.
  • grida_billing.account.provisioning_uid: per-account UUID composed into Metronome aliases. supabase db reset produces fresh aliases — any orphan Metronome customers from previous instances are inert. No manual cleanup needed.

User-facing billing copy: docs/platform/billing.mdx. Design notes: docs/wg/platform/billing/ (AI credits master plan, Metronome integration, known issues). CLI guide: editor/scripts/billing/README.md.

Troubleshooting​

  • STRIPE_SECRET_KEY is required — .env.test.local not loaded.
  • plan.pro price not wired — re-run cli.ts setup:stripe after db reset.
  • Metronome substrate missing — re-run cli.ts setup:metronome.
  • Stripe webhook signature failing — stripe listen was restarted; new whsec_…. Update STRIPE_WEBHOOK_SECRET.
  • Metronome webhook signature mismatch — METRONOME_WEBHOOK_SECRET differs from the value in Metronome Dashboard. Re-copy.
  • Tunnel returns 404 — WEBHOOK_TUNNEL_HOSTNAME doesn't match the routed hostname, or cloudflared isn't running. Re-run from cli.ts smoke:webhook to pinpoint which layer is broken.
  • Customer Portal "no Stripe customer" — org hasn't subscribed or topped up yet. Stripe customer is lazy-created on first paid action.
  • AI credit shows "Out of credit" forever after a successful top-up — Metronome webhook didn't reach the tunnel. Run cli.ts smoke:webhook to verify each layer.

Required env reference​

VariableWhere
NEXT_PUBLIC_SUPABASE_URLeditor/.env.test (committed)
SUPABASE_SECRET_KEYeditor/.env.test.local
STRIPE_SECRET_KEYeditor/.env.test.local
STRIPE_WEBHOOK_SECRETeditor/.env.test.local
METRONOME_API_TOKENeditor/.env.test.local
METRONOME_WEBHOOK_SECRETeditor/.env.test.local
WEBHOOK_TUNNEL_HOSTNAMEeditor/.env.test.local
BILLING_E2E, BILLING_TEST_MODE, APP_URLeditor/.env.test (committed)