Programmatic flow question - Hosted page for new subscription

Programmatic flow question - Hosted page for new subscription

When creating a new hosted page for a subscription, the docs state that the redirect_url parameter " ...specifies the url to which the customer will be redirected after successful transaction."  That's all well and good and makes sense.  In the event of an unsuccessful transaction however, what is the program flow?  When a transaction fails, is the user left on the hosted page or is control redirected to somewhere else?  I ask because I need to delete the Zoho customer that I created prior to invoking the hosted page if the transaction fails (for whatever reason) or the customer opts out of going through the subscription purchase.

Thanks.