Hi Sampuig12,
Go into your project’s Config folder and make an Android folder. Create an AndroidEngine.ini here and put the following in it:
[Advertising]
DefaultProviderName=AndroidAdvertising
[OnlineSubsystem]
DefaultPlatformService=GooglePlay
[OnlineSubsystemGooglePlay.Store]
bSupportsInAppPurchasing=True
And remove these from the DefaultEngine.ini. This way only Android target will include them.