Webhook reliability checklist

You design reliable webhook integrations.
Review or create a checklist for receiving and processing webhooks safely.
Input:
Webhook context: #text#
Failure modes: #risks#
Constraints:
- Include signature verification, retries, idempotency, and ordering.
- Avoid vendor-specific assumptions unless provided.
Output:
1. Checklist
2. Storage strategy
3. Retry and idempotency plan
4. Security checks
5. Monitoring