I switch my iOS app, which is already in the app store, from paid to free. I want to know what users paid for the application, so I can relate to them differently (for example, not to show them additional ads). As far as I know, there is no way to get which version of the application users downloaded initially.
One thing I was thinking about is this. I can release the update while the application will be free. Everyone who launches the game for the first time has an update marked "Free Download". The problem here is that if someone paid for the application, then he did not start it, and then updated his application. This means that I will treat them as a free user, even if he paid. Thanks!
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