Step 2: Add Slot Verification Logic

Route incoming requests based on whether the payload is asking to check availability or create a booking.

1. Add the Verify Slot Inquiry node and connect it to Incoming Webhook Trigger.
2. Configure the condition to compare Left Value to {{ $json.body.tool }} and set Operator to equals.
3. Set Right Value to checkAvailableSlot.
4. Understand the branching: Verify Slot Inquiry outputs to Check Calendar Availability on the “true” path, and to Create Booking Request on the “false” path.

Step 3: Connect Cal.com and Check Availability

Configure the availability lookup against Cal.com to validate slots before booking.

1. Add the Check Calendar Availability node and connect it from the “true” output of Verify Slot Inquiry.
2. Set URL to https://api.cal.com/v1/slots and enable Send Query.
3. Add query parameters:
   • startTime = {{ $json.body.startTime }}
   • endTime = {{DateTime.fromISO($json.body.startTime, { zone: 'Asia/Kolkata' }) .set({ hour: 18, minute: 0, second: 0 }) .format("yyyy-MM-dd'T'HH:mm:ssZZ")}}
   • eventTypeId = [YOUR_ID]
   • timeZone = Asia/Kolkata
4. Credential Required: Connect your calApi credentials.

Step 4: Create Booking Requests

Configure booking creation in Cal.com for requests that aren’t availability checks.

1. Add the Create Booking Request node and connect it from the “false” output of Verify Slot Inquiry.
2. Set URL to https://api.cal.com/v1/bookings and Method to POST.
3. Set Specify Body to json and use the following JSON Body:
4. { "eventTypeId": "[YOUR_ID]", "start": "{{ $json.body.startTime }}", "end": "{{ DateTime.fromISO($json.body.startTime).plus({ minutes: 30 }).format("yyyy-MM-dd'T'HH:mm:ssZZ") }}", "responses": { "name": "{{ $json.body.name }}", "email": "{{ $json.body.email }}" }, "timeZone": "Asia/Kolkata", "language": "en", "title": "Test", "metadata":{} }
5. Credential Required: Connect your calApi credentials.

Step 5: Configure the Webhook Response

Return data back to the caller after availability checks or booking creation.

1. Add the Return Webhook Response node.
2. Connect both Check Calendar Availability and Create Booking Request to Return Webhook Response.
3. Leave default settings unless you want to customize the response payload.

Step 6: Test and Activate Your Workflow

Run a full end-to-end test to ensure webhooks, routing, and Cal.com calls work as expected.

1. Click Execute Workflow and send a sample POST request to the Incoming Webhook Trigger test URL.
2. Verify that a payload with {"tool":"checkAvailableSlot"} routes to Check Calendar Availability and returns availability through Return Webhook Response.
3. Verify that a payload without that tool value routes to Create Booking Request and returns the booking response through Return Webhook Response.
4. Once successful, toggle the workflow to Active and use the production webhook URL.