Appointo has a unique feature which allows you to provide bundles or class pass to your customers. You can also have recurring bookings or fixed bookings every month, day or week. The feature is called Subscription.
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Please go to Appointments -> Subscription to setup your first subscription
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P.S.- It will require you to Activate charges since subscription has a 2% charge and is available on all plans

Please have a look at this video to understand how you can setup Subscriptions
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