You may not know for sure, probably because Google wants developers to buy high ratings from their users using in-app items.
What could you do to ensure that you would not be 100% accurate in any way, the server checks your developer console for the next two minutes using the > developer console API , and if the number of ratings increases, send a response to the application, in which says that he credited the user. But this will only work if your application has a fairly small number of users who rate it, enough so that you don't lean against each other.
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