# Central SaaS Phase 3 Review: Stripe Billing Integration

**Date:** 2026-05-19
**Status:** COMPLETE
**VPS:** root@187.77.140.128
**Project root:** /opt/devxura

---

## What Was Implemented

Full Stripe billing integration with test mode verification complete.

### 1. Stripe Product/Price Mapping (auto-created)
| Devxura Plan | Stripe Product | Price ID | Monthly |
|-------------|---------------|----------|---------|
| Solo | Devxura Solo | price_* | $0 |
| Small Agency | Devxura Small Agency | price_* | $49 |
| Agency Pro | Devxura Agency Pro | price_* | $149 |

- Products auto-created on server startup (idempotent via `metadata.plan_id`)
- Verified: `stripeConfigured: true` in health check

### 2. Stripe Checkout Sessions
- `POST /billing/checkout` generates Stripe Checkout URLs
- Stripe Customer created on first checkout, stored as `stripe_customer_id` on developer
- Solo ($0) plan rejects checkout gracefully
- Verified: real checkout URL generated via Stripe test mode

### 3. Webhook Handling (SIGNATURE VERIFIED)
- `POST /stripe/webhook` — HMAC-SHA256 signature verification works
- Events processed: `customer.subscription.created`, `.updated`, `.deleted`
- Raw body buffering for webhook verification
- Verified: valid signatures pass, invalid signatures rejected (400)

### 4. Subscription State Sync (VERIFIED E2E)
| Stripe Status → | License State | Payment State |
|----------------|---------------|---------------|
| active/trialing | active | active |
| past_due | past_due | past_due |
| canceled/unpaid | cancelled | cancelled |
| incomplete_expired | trialing | not_required_for_trial |

- Subscription table updated on webhook
- License state auto-synced from subscription
- Verified: trialing → active → past_due transition tested end-to-end

### 5. Env Configuration
```bash
STRIPE_SECRET_KEY=sk_test_...     # Set and verified
STRIPE_WEBHOOK_SECRET=whsec_...   # Set and verified
```

### 6. Database
**Migration:** `0007_stripe_billing.sql`
- `developers.stripe_customer_id` — links to Stripe customer
- `subscriptions` table — mirrors Stripe subscription state

---

## Files Changed

| File | Lines | Change |
|------|-------|--------|
| `apps/central-app/src/stripe.mjs` | 281 | NEW — Stripe API client, product/price creation, webhook verification, subscription sync |
| `apps/central-app/src/server.mjs` | 424 | UPDATED — billing routes + webhook endpoint + `/auth/me` billing summary |
| `packages/db/migrations/0007_stripe_billing.sql` | 3 | NEW — ALTER developers + CREATE subscriptions table |
| `infra/env/.env.runtime` | 2 lines | MODIFIED — STRIPE_SECRET_KEY + STRIPE_WEBHOOK_SECRET added |

---

## Verification Summary

| Test | Result |
|------|--------|
| Health shows stripeConfigured:true | ✅ |
| Plans include Stripe price IDs | ✅ |
| Checkout URL generation | ✅ real URL returned |
| Free plan rejects checkout | ✅ |
| Webhook signature verification | ✅ valid passes, invalid rejected |
| Subscription creation via webhook | ✅ row in DB |
| License state sync: trialing → active | ✅ |
| License state sync: active → past_due | ✅ |
| Billing routes protected by auth | ✅ |

---

## Stripe Webhook Endpoint

**URL:** `https://aiinvention.tech/stripe/webhook`
**Events:** `customer.subscription.created`, `customer.subscription.updated`, `customer.subscription.deleted`

---

## What Is Still Pending For Phase 4

- Stripe Customer Portal (billing management UI link)
- Grace-period auto-scheduler (past_due → grace → expired)
- Invoice history
- Payment method management
- HTTPS routing for production webhook delivery

---

## Blockers Found

**None.** Phase 3 is complete in Stripe test mode.