Automatic Appointment Confirmations for Online Bookings are configured per Appointment Type from Settings > Online Booking > Services. For each of Email and SMS, you can choose to Use System Confirmation Settings, which applies your existing setup from Settings > Appointment Book > Confirmations, including any Business, Profession or Practitioner template overrides, or set a Custom Template, a single template used for everyone who books that Appointment Type through this Service, with no overrides.

Go to the Settings > Online Booking > Services page.

Select the Service that you want to edit by clicking on it's name.

Click on an Appointment Type.
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Click Edit at the top of the page.

Enable or Disable Confirmations for Email and/or SMS confirmations using the toggles.

For Email and SMS, choose Use System Confirmation Settings to apply your existing confirmation setup from Settings > Appointment Book > Confirmations, including any Business, Profession or Practitioner overrides, or choose Custom Template to set one template for everyone who books this appointment type through this service.

Click Save to finalise your changes.

Repeat the above steps for each Online Booking Appointment Type.