void LeaveGameMatch ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & UserId, const [FString](API\Runtime\Core\Containers\FString) & MatchId, const [TArray](API\Runtime\Core\Containers\TArray)< [FLeaveGameMatchPlayer](API\Plugins\OnlineSubsystem\Interfaces\FLeaveGameMatchPlayer) > & GameMatchLeavePlayerData, const [FOnLeaveGameMatchComplete](API\Plugins\OnlineSubsystem\Interfaces\FOnLeaveGameMatchComplete) & CompletionDelegate )