void UpdateGameMatchDetails ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & UserId, const [FString](API\Runtime\Core\Containers\FString) & MatchId, const [FGameMatchRoster](API\Plugins\OnlineSubsystem\Interfaces\FGameMatchRoster) & MatchRoster, const [FOnUpdateGameMatchDetailsComplete](API\Plugins\OnlineSubsystem\Interfaces\FOnUpdateGameMatchDetailsComplet-) & CompletionDelegate )