Are there any XCode specific APIs I am required to use to simply port an Android game to iOS, or does Unity cover everything?

Hi, I recently bought a mac for the purpose of developing for Apple. I've seen a lot of conflicting information about how 'necessary' it is to use XCode for developing multi-platform apps through Unity. For example, it is not really clear to me if I need to use the StoreKit framework if I am running Unity IAP.