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If the game is moved back to the foreground from the background, it must call the Resume API to notify the Kakao Game SDK that it has become active.

The Kakao Game SDK checks whether the authentication has expired when the Resume method is called and restores the session depending on the check. The result is then sent through the callback function inputted in the game when the method is called.

The game can use the results to decide whether to authenticate the user again or whether to resume a previous game.습니다.