If you want to unsubscribe, you can do so via several ways:
- Using Google Play Store app: go to "My apps", in the subscriptions tab and you can cancel your subscription
- Same way, using Play Store on the web (Apps > My Apps > Subscriptions)
- Going to Peak store page ( either https://play.google.com/store/apps/details?id=com.brainbow.peak.app on the web, or from Play Store app), and you will see your subscription on top of the page and can cancel it from there