Step 1: Check what your plan sends
Your plan decides whether reminders also go out by WhatsApp.
Open Settings › Integrations. On a phone or a narrow window, open Account first.
Under Messages to clients, WhatsApp Notifications shows Included on Pro and Teams. On Free it sits under Available with Pro: clients still get the booking confirmation and the cancellation by WhatsApp, and the reminders go by email only.
Done when: you know whether your clients get WhatsApp reminders as well as email.

