We recommend you integrate the existed game with PlayFab SDK firstly. If you developed the game with Java, you can find the corresponding SDK on the SDK page. Then you at least need to use PlayFab Authentication Features in your game to let PlayFab achieve the player management. If you have written the code of the authentication system, it will be necessary to rewrite the existed code. When game developers use PlayFab authentication and other features in the game, SDK will create and send the corresponding default events to PlayFab automatically, then PlayFab can do analysis. For other custom events, you also need to send them to PlayFab via PlayFab SDK to help PlayFab captures them and do the analysis. Otherwise, PlayFab cannot achieve the analysis and management of the game.
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