How to know when a user installed my app? Passing from paid to freemium

Question

I have a paid desktop app on the Microsoft Store. I will be changing the monetization from paid to freemium.
So the users will be able to download the app for free and will be offered a subscription to unlock some features.
Now the problem is that i don't want to show a subscription to old users that paid the app in the past.
How can I detect these users? Is there a first install date of the user that I can use from the Windows Store APIs?

Answer

you can use the StoreContext.GetUserCollectionAsync() method to get Microsoft Store info for the add-ons of the current app for which the user has purchased.

Ref:

StoreContext.GetUserCollectionAsync(IIterable) Method

Answer

Hello @FilBozPar ,

Welcome to Microsoft Q&A!

Now the problem is that i don't want to show a subscription to old users that paid the app in the past. How can I detect these users? Is there a first install date of the user that I can use from the Windows Store APIs?

You could take a look at Get subscriptions for a user, which contains the full request example and response body. The value expirationTime and lastModified may help.

Thank you.

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How to know when a user installed my app? Passing from paid to freemium

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