Hi there. I would like to implement a system where a user watches a rewarded ad and gets premium access for a short period of time. Like watching 1 ad = 1 day watching 2 ads +3 days access and so on. Is there a simple way I can implement this? The user has a default anonymous id. It's not important to save this status if the app is deleted and the user ID changes. The app is only available in the Google Play Store and is built with Flutter.
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