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API Webhook Security Basics
Secure inbound webhooks
Webhook security includes validating signatures/timestamps, verifying source IPs/DNS where possible, using unique URLs, idempotency keys, and limiting payload size to prevent abuse.
- webhooks security
- signatures
- allowlist
- idempotency
- replay
Validate
Check HMAC/signature and timestamp; reject stale/replayed requests.
Restrict
Unique URLs, IP/DNS allowlists if feasible; small payload limits.
Protect
Use idempotency keys; monitor failures; rotate secrets.
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