At Alarmhandler the first 30 days are free so you can try the service of before you buy your subscription. After 30 days trial has expired, you can see a banner appearing in the bottom of the app. If you’re happy with the app and want to support the continued development as well as use the premium features such as camera recording, then tap Upgrade to Premium in the Menu. From there you can do an In App Purchase from Google and Apple.