# Trajectory: Implement Stripe webhook handler routes, engine, and tests

> **Status:** ✅ Completed
> **Task:** wave-7/billing
> **Confidence:** 92%
> **Started:** February 7, 2026 at 11:40 PM
> **Completed:** February 7, 2026 at 11:40 PM

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## Summary

Added Stripe webhook processing engine (subscription updated/deleted, invoice paid/payment_failed) plus /v1/billing/webhooks route and full route+engine tests. Updated app.ts to mount webhookRouter.

**Approach:** Standard approach

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## Key Decisions

### Mounted webhooks router under /v1 without auth; validate only event.type and always ACK Stripe
- **Chose:** Mounted webhooks router under /v1 without auth; validate only event.type and always ACK Stripe
- **Reasoning:** Stripe webhooks must not require workspace/agent auth; returning 200 on processing errors prevents retry storms while we log internally.

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## Chapters

### 1. Work
*Agent: default*

- Mounted webhooks router under /v1 without auth; validate only event.type and always ACK Stripe: Mounted webhooks router under /v1 without auth; validate only event.type and always ACK Stripe
