Some of the app features can be used only by auto-renewable subscription:
Subscription period is monthly or yearly. Every month or year respectively, your subscription renews.
Subscription price starts with $0.99 a month or $11.99 a year, Exact price relevant to local currency would be shown on payment screen.
A 7-day free trial is available for all users
Payment will be charged to iTunes Account at confirmation of purchase
Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period
Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal
Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase
No cancellation of the current subscription is allowed during active subscription period
Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication.