You can turn off automatic renewal in your iTunes account settings at any time, but you must do so at least 24 hours before the end of the current term.
At the end of the term, unless auto-renewables subscriptions are disabled, your subscription will automatically renew in your iTunes account.
You will be charged for the regular price of your subscription within 24 hours prior to the end of the current term.
Stash is an extension that lets you store your favorite links to a 100% private list on your phone.
Your subscription will be charged to your iTunes account.