Slack

Solo, Growth and Ultimate workspaces can push a short Slack message whenever a click is recorded. This uses Slack incoming webhooks, not a full Slack app OAuth install.

Create the Slack webhook

1. In Slack, open the Incoming Webhooks integration (Apps → Incoming Webhooks).
2. Add a new webhook to the workspace and pick a channel. A dedicated #link-clicks channel is strongly recommended — busy campaigns will post often.
3. Copy the URL. It looks like https://hooks.slack.com/services/….

Connect Letlink

1. Open Integrations → Slack. Owners and admins only.
2. Paste the URL and save. Letlink only accepts hooks.slack.com incoming-webhook URLs.
3. Click a test link. You should see a message with the short URL, device/browser, variation, and referrer when those are present.

Message shape

The post is Slack Block Kit: a section whose markdown includes a clickable https://{host}/{code} plus optional Device, Variation, and Referrer lines. The fallback text field is Click on {host}/{code} for notifications that ignore blocks.

Noise and caps

One recorded click = one Slack message. Filter upstream (split-test only, QR only) by using n8n or Zapier instead of Slack-on-every-click. Past the monthly tracked-click cap, Slack goes quiet even though visitors still redirect. Clear the URL in the form to disconnect.