When New Attendee registered in HeySummit, send template message to WhatsApp using WhatsApp Cloud API
When a new attendee registers for your HeySummit event, this workflow sends them an approved WhatsApp template message through the WhatsApp Cloud API, such as a welcome note with the event details.
HeySummit
WhatsApp Cloud API2 steps Setup ~5 min Used on 2.2k sites Free to import

What this workflow does
Virtual summit sign-ups usually get a confirmation email, and that email competes with everything else in the inbox. A WhatsApp message on registration gives attendees a second confirmation in a chat they can find again on the day. This workflow sends it as each person registers.
The HeySummit trigger fires when a new attendee registers for an event. FlowMattic takes the attendee and event data and passes it to the WhatsApp Cloud API step, which sends a template message to the phone number you map. You pick one of your approved templates and fill its placeholders with values such as the attendee's name or the event title.
Because it is a template, WhatsApp can deliver it to people who have never messaged your business number. The step does need a phone number, so your HeySummit registration has to collect one. A test registration shows whether the trigger carries it. Task History records each send and any error.
Online summit welcome message
Each attendee who registers for a multi-day virtual summit gets a WhatsApp template welcoming them and telling them where to find the schedule.
Webinar series for a coaching business
A coach running a free webinar series on HeySummit sends registrants a WhatsApp confirmation, matching how many of their clients prefer to be reached.
Regional events with low email use
Organisers in markets where WhatsApp is the main channel confirm each HeySummit registration there instead of relying only on email.
How this workflow runs
What happens at each step once the workflow is on, and what you need before you import it.
HeySummit Attendee Registration StartedRuns when a new attendee registers for one of your HeySummit events. Their registration details and the event data are passed to the WhatsApp step.
WhatsApp Cloud API Send Template MessageSends one of your approved WhatsApp templates to the attendee through the WhatsApp Cloud API. Connect your account, pick the template, map the phone number and fill the template's variables.
What you need
- FlowMatticCore
- HeySummit AccountAccount
- WhatsApp Cloud API AccountAccount
After importing, map your own data. To keep the template universal, not every step is pre-filled. Open each step in the builder and connect your accounts and fields (channels, lists, sheets, recipients) before you switch the workflow on.
Make it yours
Changes worth making after you import it.
- Make sure your HeySummit registration collects a phone number, then run a test sign-up to confirm the number reaches FlowMattic before you map it.
- Numbers sent to the WhatsApp Cloud API should carry the country code. Ask HeySummit registrants to type it, and look at a test run if a message fails.
- Running several events? Add a Filter after the trigger that continues only for the event this template is written for, based on an event value from the test data.
Questions about this workflow
Do HeySummit attendees need to message my WhatsApp number first?
No. Template messages approved for your WhatsApp Business account can be delivered without an earlier conversation, which is why this step uses one.
What if a HeySummit attendee didn't give a phone number?
The WhatsApp step has nothing to send to, so that run shows an error on the step in Task History. HeySummit's own emails to the attendee are not affected.
Can I use a free-form WhatsApp text instead of a template?
WhatsApp only delivers free-form text within 24 hours of the person messaging your business number, so new registrants usually wouldn't receive it. Keep the template step.
Are attendees who registered before the workflow was on messaged?
No. Only registrations made while the workflow is active start a run.
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