Are there fees associated with the subscriptions?

After you enroll a customer in a subscription through the app, a 1.2% app fee is deducted from each subscription payment that's processed (on top of your base Stripe fees).

The 15¢ minimum app fee does not apply to subscriptions. Subscription payments are charged 1.2% with no minimum, regardless of when your account was created.

More on fees here: What are the fees for using Stripe and the Payment app?