To check your in-app subscription, follow the below steps.
Click on the 'settings' icon below.
Then select 'Manage Subscriptions'.
Choose 'Open'. This will take you to the app store.
Select 'Storm Shield' by clicking the > out to the right hand side.
Down below, you can see the details about your subscription and choose to cancel if you wish. If you do cancel,
you will still have access until the subscription time expires.