Stripe security for subscriptions

Hi,

I noticed that s2member PRO will automatically create subscriptions that do not yet exist in the stripe dashboard, using the data passed from the checkout form.

How does s2member prevent the creation of subscriptions that a tech savvy user might create himself by manipulating the data passed to s2member?
With paypal there is the option of encrypting the button, i couldn’t find anything similar for stripe.

Thank you