Previously, emails sent when a booking is made or modified would include an .ics calendar event which was added as "pending" to the customer's online calendar e.g. Apple, Google, Exchange etc.
Now, the event is added automatically to the customer's calendar "confirmed" i.e. the customer doesn't need to respond yes or no.
This ensures that the customer doesn't need to do anything manually, that they understand that the booking is confirmed and that the business is not notified by email when the customer clicks yes.