Follow Up With Confirmed Attendees on WhatsApp
When someone says yes, instantly ask on WhatsApp whether they need the agenda, have questions, or want prep materials—collect info without extra back-and-forth.
Trigger
Attendee Response Changed
Polling trigger that fires when any attendee's RSVP changes to accepted, declined, or tentative. Returns attendee info and current status.
Action
Send interactive buttons
Send an interactive button message to a whatsapp number. button messages allow users to quickly respond by tapping up to 3 predefined buttons. perfect for yes/no questions, quick choices, or call-to-action scenarios. note: the message will be delivered to the recipient only if they have texted first.
Why this helps
Attendees confirm but don't mention prep needs or questions; you waste time the day before the meeting asking 'Does anyone need anything?'
- Proactive problem-solving: attendees tell you upfront if they need prep, rather than you guessing
- Less day-of scrambling: you know who needs materials before the morning of the meeting
- Interactive flow: buttons make it easy for attendees to flag issues or ask for help
Setup
Build it in a few focused steps.
- 1Connect Google Calendar and WhatsApp business accounts to Notis.
- 2Create a new automation: 'When an attendee accepts a calendar event, send them a WhatsApp message with buttons asking: Need Agenda? Need Prep Materials? Have Questions?'
- 3Set the trigger to 'Attendee Response Changed' (for accepted responses).
- 4Pick your run-report channel.
- 5Test with a colleague accepting an invite and confirm the follow-up buttons appear.
Questions about this workflow
Can I customize the buttons or add more options?
Yes, WhatsApp allows up to 3 buttons per message. Tell Notis: 'Send buttons for Agenda, Prep Materials, Questions' or any other options that make sense for your meetings.
What happens after someone taps a button?
You can tell Notis to respond with specific information (e.g., 'If they tap Agenda, send the PDF'), or log their response for you to review before the meeting.
Will this send buttons to everyone or only external attendees?
By default, to all attendees. You can refine it—e.g., 'Only send to external guests, not to internal team members.'
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
Recurring trigger
Notis starts this workflow on a schedule, such as daily, weekly, or during business hours.
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.
Webhook trigger
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
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.
Attendee Response Changed
Polling trigger that fires when any attendee's RSVP changes to accepted, declined, or tentative. Returns attendee info and current status.
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.
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.
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 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 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 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 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 Created
Polling trigger that fires when a new calendar event is created. Returns event ID, summary, start/end times, and organizer info.
Get phone number
Get details of a specific phone number associated with a whatsapp business account.
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 phone numbers
Get all phone numbers associated with a whatsapp business account (waba).
Connect any two apps with Notis in the middle.
Google Calendar and Whatsapp, or any other combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
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