An example may look something this
These fields that are purple are "variables" that you need to select in your message creation. The Video Call Link is automatically generated by Bookem and will use Bookems native video call functionality.
If you choose to use Google Meet, Zoom or any other, you can manually change this by pasting the new link directly into the appointment in your calendar - see below
The automated reminders need to be linked to any services that are Video Call Services, do that in "Settings - Services - Automated Messages"