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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.

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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