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In this tutorial, we will use Tightknit webhooks and the Admin API to automatically detect which Zoom account is free, create the meeting on that account, and deliver each registrant a personalized join link — all through the native Tightknit experience. Two automations run in the background:
  • Automation 1 — On event publish: Checks each connected Zoom account for scheduling conflicts, creates a meeting on the first free account, and stores the join URL.
  • Automation 2 — On registration: Retrieves the stored join URL and calls the Tightknit API to set a personal_join_link on the attendee. Members then see a native “Join Event” button in their event reminders and events list.
1

Create two webhook endpoints in Tightknit

In the Tightknit webhooks admin portal, create two endpoints:
EndpointEvent types to subscribe
Endpoint 1 (Automation 1)calendar_event.published
Endpoint 2 (Automation 2)calendar_event.user_registered
You’ll fill in the URLs from your automation tool in the next steps.
2

Enable webhooks on each event

When creating or editing a Tightknit event, open Registration Settings and check Enable Webhooks. No other configuration is needed — the automation detects the right Zoom account automatically.
3

Build Automation 1 — Auto-detect a free Zoom account and create the meeting

This automation fires when a Tightknit event is published. It checks each Zoom account for a scheduling conflict, creates a meeting on the first free account, and stores the join URL.
Create a new Zap with a Webhooks by Zapier > Catch Hook trigger. Copy the URL and paste it into Endpoint 1 in Tightknit.Click Test trigger, then publish a test event to capture sample data. Confirm you can see event.id, event.start_date, and event.end_date.Add a Webhooks by Zapier > GET action to call https://api.zoom.us/v2/users/me/meetings?type=scheduled connected to Account A, then add a Code by Zapier step to check for conflicts:
const eventStart = new Date(inputData.event_start).getTime();
const eventEnd = new Date(inputData.event_end).getTime();
const meetings = JSON.parse(inputData.meetings || '[]');

const hasConflict = meetings.some(m => {
  const mStart = new Date(m.start_time).getTime();
  const mEnd = mStart + (m.duration * 60 * 1000);
  return mStart < eventEnd && mEnd > eventStart;
});

output = [{ has_conflict: hasConflict ? 'true' : 'false' }];
Add a Paths step to route based on the result:
  • Path A: Has Conflict exactly matches false → create meeting on Account A
  • Path B: Has Conflict exactly matches true → create meeting on Account B
Inside each path, add a Zoom > Create Meeting action (map Event Title, Event Start Date, and duration from the trigger). Then add a Storage by Zapier > Set Value action:
  • Key: zoom_meeting_{{event.id}}
  • Value: Join URL from the Create Meeting step
Turn the Zap on.
To support three or more accounts, add a second conflict check inside Path B before creating the meeting, following the same pattern.
4

Build Automation 2 — Deliver the join link on registration

This automation fires when a member registers. It retrieves the stored join URL and sets it on the attendee record so they receive a native “Join Event” button.
Create a new Zap with a Webhooks by Zapier > Catch Hook trigger. Copy the URL and paste it into Endpoint 2 in Tightknit.Click Test trigger, then register for the test event in Slack. Confirm the payload includes event.id and user.slack_user_id.Add a Storage by Zapier > Get Value action with Key: zoom_meeting_{{event.id}}.Add a Webhooks by Zapier > POST action:
  • URL: https://api.tightknit.ai/admin/v0/calendar_events/{{event.id}}/attendees
  • Payload Type: JSON
  • Data: 
    {
  "user": { "slack_user_id": "{{user.slack_user_id}}" },
  "personal_join_link": "{{retrieved_join_url}}"
}
  • Headers: Authorization: Bearer YOUR_TIGHTKNIT_API_KEY
Turn the Zap on.
You can create a Tightknit API key in your API settings.
5

Test end to end

  1. Create a test event in Tightknit with Enable Webhooks checked.
  2. Publish the event. Confirm Automation 1 ran — check your storage for a join URL and verify the meeting was created on the expected Zoom account.
  3. Publish a second event at the same time. Confirm it was assigned to a different Zoom account.
  4. Register for one of the events in Slack as a test user.
  5. Confirm Automation 2 ran — the member should see a “Join Event” button in their Tightknit event reminder.

⚡ Zapier Webhook → Zoom Webinar

⚡ Make Webhook → Zoom

Event Registration

Webhooks