void ItemAvailabilityChange ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & LocalUserId, const [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > & AvailableItems, const [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > & UnavailableItems, [FOnItemAvailabilityChangeComplete](API\Plugins\OnlineSubsystem\Interfaces\FOnItemAvailabilityChangeComplet-) CompletionDelegate )