1 month subscription (1 issue): renewed until subscription is cancelled.
3 month subscription (3 issues): renewed until subscription is cancelled.
6 month subscription (6 isues): renewed until subscription is cancelled.
1 year subscription (12 issues):renewed until subscription is cancelled.
Actual prizes for subscription is shown, when you click on the "Subscripe" button in the app. When you confirm your subscription, your iTunes account will be charged the amount.
Your subscription will automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period. Your iTunes account will automatically be charged at the samme price for renewal within 24-hours prior to the end of the current period, at the same period length, unless you change your subscriptions preferences in your settings. You can manage your subscriptions through your Account Settings after purchase, though no cancellation of the current subscription will be allowed during an active subscription period.
More information on: https://support.apple.com/da-uk/HT202039