Webhook-Triggered WhatsApp Messages for Calendar Events
Integrating a custom scheduling app or third-party calendar? Send a webhook to Notis and it forwards event notifications to WhatsApp, no extra setup needed.
Trigger
Webhook received
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Action
Send message
Send a text message to a whatsapp number. note: the message will reflect on the recipient's phone number only if they have texted first.
Why this helps
Your custom scheduling tool or third-party calendar sync works, but notifications only go to email or Slack, fragmenting your awareness.
- Flexibility: works with any tool that can send webhooks, not just official integrations
- Unified notifications: all calendar events land on WhatsApp regardless of source
- Developer-friendly: webhook payloads are flexible, so you control what data flows through
Setup
Build it in a few focused steps.
- 1Connect Google Calendar and WhatsApp business accounts to Notis.
- 2Get your Notis webhook URL from the automation creation screen.
- 3Set your external tool to POST event data to that webhook URL when events occur.
- 4Create a new Notis automation: 'When a webhook fires, send the event details to WhatsApp: [format the payload as a readable message].'
- 5Test by triggering your external tool and confirm the message arrives on WhatsApp.
Questions about this workflow
What data can I send in the webhook payload?
Any JSON data. Common payloads include event title, time, attendees, and custom fields. Notis will parse and format whatever you send.
Do I need to know how to code to set this up?
You'll need someone who can configure your external tool to send webhooks. Once that's done, Notis handles the rest in plain language—no coding needed in Notis itself.
Can multiple tools send webhooks to the same Notis automation?
Yes. You can share the same webhook URL across different tools, and Notis will process all payloads through the same automation.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Google Calendar to Whatsapp. A trigger fires from one place; an action lands in another.
Google Calendar triggers
Whatsapp actions
Attendee Response Changed
Polling trigger that fires when any attendee's RSVP changes to accepted, declined, or tentative. Returns attendee info and current status.
Create message template
Create a new message template for the whatsapp business account. templates must be approved by whatsapp before they can be used. templates are required for marketing messages and messages sent outside the 24-hour window.
Event Canceled or Deleted
Triggers when a Google Calendar event is cancelled or deleted. Returns minimal data: event_id, summary (if available), and cancellation timestamp.
Delete message template
Delete a message template from the whatsapp business account. this permanently removes the template and it cannot be recovered. only delete templates that are no longer needed.
Event Starting Soon
Triggers when a calendar event is within a configured number of minutes from starting. Returns event details, time remaining, attendees, and join links when available.
Get business profile
Get the business profile information for a whatsapp business phone number. this includes business details like description, address, website, and contact info.
Calendar Event Changes
**SOON TO BE DEPRECATED** - Use Calendar Event Sync (polling trigger) instead. Real-time webhook trigger for calendar event changes. Returns event metadata only. For full event data, use Calendar Event Sync (polling trigger).
Get media
Get information about uploaded media including a temporary download url. the download url is valid for 5 minutes and can be used to retrieve the actual media file. this is useful for downloading media that was sent to your whatsapp number.
Event Created
Polling trigger that fires when a new calendar event is created. Returns event ID, summary, start/end times, and organizer info.
Get media info
Get metadata about uploaded media without generating a download url. this is useful for checking file size, type, and hash without downloading the file. use get media if you need the actual download url.
Calendar Event Sync
Polling trigger that returns full event data including details, attendees, and metadata. For real-time notifications with basic info, use Calendar Event Changes (webhook).
Get message templates
Get all message templates for the whatsapp business account. templates are required for sending messages outside the 24-hour window and for marketing/utility messages.
Event Updated
Triggers when an existing Google Calendar event is modified. Returns the event ID, change type, and the specific fields that changed with their previous and new values.
Get phone number
Get details of a specific phone number associated with a whatsapp business account.
Get phone numbers
Get all phone numbers associated with a whatsapp business account (waba).
Connect any two apps with Notis in the middle.
Not just Google Calendar and Whatsapp. Any combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
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