Webhook Headers - AAArdvark

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Every outgoing webhook arrives with these HTTP headers.

Header	Always sent?	Value	What it’s for
`Content-Type`	Yes	`application/json`	Tells you the body is JSON.
`Signature`	Yes	Hex string	The HMAC-SHA256 fingerprint of the raw body, made with your secret. Use it to confirm the message is genuine.
`X-Webhook-Delivery-Id`	Yes	UUID	A per-delivery ID that stays the same across retries. Use it to ignore duplicates.
`User-Agent`	Yes	`AaardvarkWebhooks/1.0`	Let’s you recognize AAArdvark traffic in your logs and load balancers.
`X-Webhook-Replay`	Only on replays	`true`	Marks the message as part of a historical backfill.

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