Use case
Automatic WhatsApp appointment reminders
People read WhatsApp. A reminder there, from the number they already know, gets seen. With Flow API your calendar or booking tool sends the reminder automatically and the client can answer in the same chat.
How it works
- 1A booking is created in your calendar, CRM or booking app.
- 2Make, n8n or Zapier sends an instant confirmation with sendMessage.
- 3A scheduled step sends a reminder 24 hours before, optionally with a poll: "Confirm" / "Reschedule".
- 4Replies arrive by webhook, so you can update the booking automatically.
A message that works
Hi Dana, a reminder of your appointment tomorrow, Tuesday at 10:30, at Bright Dental Clinic. Reply 1 to confirm or 2 to reschedule.
Good practice
- Only message clients who booked with you and gave their number for this.
- Send at reasonable hours in the client's time zone.
- Use sendTyping before longer replies so the chat feels personal.
Questions
Do I need message templates?
No. Flow API sends from your linked WhatsApp account, so there is no Meta template approval.
Try it on your own number
7 days free, no credit card. Then $10 per number per month.