Length: Monthly or Yearly (check in-app for current offers)
Price: $4.99/month or $39.99/year (prices may vary by region)
Payment: Payment will be charged to your iTunes Account at confirmation of purchase.
Auto-Renewal: Your subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period.
Management: Your account will be charged for renewal within 24-hours prior to the end of the current period. You can manage your subscriptions and turn off auto-renewal by going to your Account Settings on the App Store after purchase.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/