# Demo: migrate the notifier to webhooks

Objective: replace the polling notifier with webhook delivery.

## Plan
1. Add a webhook registration endpoint   ← done in this version
2. Deliver events with HMAC signatures   ← done: sha256, key per registration
3. Retire the poller

(This is wr.fi's permanent demonstration handoff — every version below is real.)

## Review fix
Replay protection: 5-minute timestamp window on signatures.