No. All sales are final unless you cancel your subscription during your 7-day free trial period.
How do I purchase a Breath Hub subscription?
To purchase a Breath Hub subscription, at first install, you can choose one of the available packages. Upon expiration of your subscription, the app will automatically prompt you to the subscription page when you try to play an audio session that requires a subscription. You can manage your subscriptions from Profile > Subscription > Manage subscription on the app, or from your phone’s app store.