Subscribe Appointment Calendar

Firstly you must turn on Date & Time Slots feature. Make sure to click 'Save'.

Go to 'Calendar Subscription' tab.

Click 'Activate Calendar Subscription' button to generate a secret subscription URL.

Copy the URL by clicking the right green button inline with the URL address.

Setup your Apple Calendar / Google Calendar to add the Calendar Subscription.

Your Appointment will show up on your Calendar app.