Zapier's official WhatsApp connector doesn't allow sending messages to others; it only allows sending messages to your private number, and only using specific templates. This works when you want to get notified, for example, whenever there's a new sale. However, it's very limited if you want to notify contacts, clients, prospects, etc.
However, there are third-party apps that can help!
Build a multi-date Airtable payment reminder calendar for due dates, cancellations, and trip windows, then subscribe via iCal so every deadline appears in Google Calendar—without missed cutoffs.
When tour travelers switch tours, stale flight records can reappear in Airtable. Fix it in 4 steps: trace the automation, add a Flight Change view, resend override, unlink/delete.