Add Webhooks page to Token Gated Forms#112
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Documents per-form webhooks (P-1959): setup, native Slack support, the JSON payload + headers, HMAC signature verification (Node/Python), inspecting requests on webhook.site, and delivery/retry behavior. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Explain the signing model (authenticity/integrity/replay protection), why the signature differs on every send, secret handling, and the public-URL/SSRF restriction. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
yosriady
approved these changes
Jul 23, 2026
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| ## How the security works |
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| ## How the security works | |
| ## Security |
| - **Only public `http(s)` endpoints are allowed.** URLs that resolve to private, loopback, link-local, or internal-cloud addresses are rejected, so a webhook can't be used to probe internal infrastructure. | ||
| - **Slack** incoming webhooks don't use the secret. They authenticate by the secrecy of their URL, so keep the URL private and rotate it in Slack if it leaks. | ||
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| ## Verifying the signature |
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| ## Verifying the signature | |
| ### Verifying signatures |
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| ## Payload |
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| ## Payload | |
| ## Sample Payload |
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| ## Add a webhook |
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| ## Add a webhook | |
| ## Setup |
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| ## Slack |
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| ## Slack | |
| ### Slack |
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| title: 'Webhooks' | |||
| description: 'Send each new form response to an external URL as it arrives: Zapier, Make, n8n, your own server, or straight into a Slack channel.' | |||
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| description: 'Send each new form response to an external URL as it arrives: Zapier, Make, n8n, your own server, or straight into a Slack channel.' | |
| description: 'Send each new form response to other tools as it arrives: Zapier, Make, n8n, or Slack.' |
- Remove all <Tip> and <Warning> callouts; trim internal detail - Rename headings: Setup, Sample Payload, Security, ### Slack, ### Verifying signatures - Shorten the frontmatter description Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Summary
Adds a Webhooks page under Features → Token Gated Forms, documenting the per-form webhooks feature (P-1959, formono PR #2076). Covers setup, native Slack support, the payload and headers, HMAC signature verification, inspecting requests on webhook.site, and delivery/retry behavior.
Key Changes
features/token-gated-forms/webhooks.mdx— setup steps, Slack, JSON payload + header table, signature verification (Node + Python), webhook.site inspection tip, delivery semantics.docs.json.Published URL:
https://docs.formo.so/features/token-gated-forms/webhooks— matches the "Learn more" link added in the app's Webhooks settings.🤖 Generated with Claude Code
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