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docs(webhooks): document additionalSignatureHeaders for custom HMAC sources #5045

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docs(webhooks): document additionalSignatureHeaders for custom HMAC sources #5045

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57c4c76
docs(webhooks): document signing secret rotation grace period
mintlify[bot] Oct 21, 2026
dbc030c
docs(webhooks): trim to additionalSignatureHeaders, rotation docs lan…
mintlify[bot] Oct 22, 2026
d574cf3
docs(webhooks): drop rotation docs covered on main, keep additionalSi…
mintlify[bot] Oct 22, 2026
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2 changes: 2 additions & 0 deletions docs/webhooks/sources.mdx
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Expand Up @@ -150,6 +150,8 @@ export const internalEvents = webhook({
});
```

To accept a signature from more than one header, list the extra headers in `additionalSignatureHeaders` (up to 4). Trigger.dev parses each one like `signatureHeader` and accepts a match in any of them. Use this when a provider sends a second signature, for example one signed with the previous secret during a rotation. `signatureHeader` is still required. The built-in [`hookdeck()`](#hookdeck) source already checks `X-Hookdeck-Signature-2` this way.

@devin-ai-integration devin-ai-integration Bot Oct 22, 2026

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🔍 Hookdeck example points to nonexistent source

The #hookdeck anchor has no matching section, and webhookSources exposes no hookdeck() preset. Readers cannot follow this example or configure the claimed built-in source.

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The optional `setupPrompt` is the provider-specific part of the endpoint's [setup prompt](/webhooks/connect#set-it-up-with-an-ai-agent): where the provider's webhook settings are and how to register a URL there. Trigger.dev adds the URL, the subscribers' filters and the signing secret steps around it.

### Form-encoded bodies
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