Docs / Vendor onboarding

Connect Slack webhooks to Relin

Relin receives Slack webhooks, verifies signatures, stores payloads, and delivers them to your endpoints with retries, alerts, and replay.

Open the Slack dashboard

Before you start

  • Create a Relin workspace and sign in.
  • Have admin access to the Slack account where you'll configure the webhook.
  • Decide which events you want to capture, or start with "all events" if you're exploring.

Setup steps

  1. In Relin, open your workspace and click New source. Pick the Slack tile.
  2. Copy the ingest URL Relin shows. This URL is shown once, so store it.
  3. Open your Slack app event subscriptions.
  4. Send events to the Relin source URL.
  5. Paste the app signing secret here.
  6. Save and send a test event from Slack. Confirm Relin received it in your workspace.

Signing secret: Paste the signing secret from your Slack app.

What Relin does next

  • Verifies the signature on every incoming event and records the status (verified, failed, unchecked).
  • Stores the payload so you can replay or inspect it later, bounded by your workspace retention window.
  • Delivers the event to every destination you've connected to this source, with retries and per-destination rate limits.
  • Surfaces lifecycle gaps (for vendors with known lifecycles) as anomalies you can triage from the dashboard.

Test it

The fastest check is the events view in your workspace. After you send a test event from Slack, it appears within a second or two. Click into the event to see the raw payload, signature status, and the delivery attempts to your destinations.

You can also use the REST API or the MCP tools to inspect the stream programmatically.

Slack-specific notes

  • Slack's url_verification challenge is handled automatically by Relin. You will see the Events API subscription go to Verified within a few seconds of saving the URL.

Troubleshooting

  • Signature status is failed: the signing secret doesn't match. Re-copy it from Slack and update the Relin source.
  • Signature status is unchecked: no signing secret is configured on the source yet. Paste the secret on the source settings page.
  • No events arriving: check that the ingest URL in Slack matches the URL Relin shows, including the token segment at the end.
  • Events arrive but destinations fail: open the delivery attempts tab on the event detail page. Each attempt shows the response body, status, and timing.

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