Making a Callbackproxy blueprint function

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Hi

In my app I want to be able to save things on iCloud so I’m looking in to doing it with OnlineSub->GetSharedCloudInterface();. Which I understand a little bit. However I’m trying to make a function like “Make an In-App Purchase” which I have a base script but I don’t get the second function like In App purchases. Does anyone know if there are any tutorials of some sort or more information about using cloud on ue4? I haven’t found much

https://docs.unrealengine.com/latest/INT/BlueprintAPI/Online/inAppPurchase/MakeanIn_AppPurchase/index.html

Thanks in advance