If you have bought a Spamdrain subscription from within our iPhone app you have used Apple's In App Purchase subscription. These subscriptions you will need to manually renew each year in the app. You may also always pay on our web site instead if you prefer that. The In App Purchase subscriptions are entirely handled by Apple and we cannot renew, cancel or issue refunds for these subscriptions. Only Apple is allowed to do that. Our systems will only verify that you have a valid subscription running but we cannot affect the subscription itself.
To view and manage your subscriptions you go to App Store->View Account and click Manage App Subscriptions. For more information, please read Apple's help pages:
https://support.apple.com/en-gb/118428