In app purchase how do I select the amount of money?

So I got unreal engine 4 and I wanna make a iOS and Android in app purchase but I don’t know tow to. I have seen the blueprint, but I don’t understand how you select the amount of money to trade to get currency.

In-app purchases are set up outside Unreal Engine. For example, to have them on iOS you need to set up amounts in your Apple Developer website, which can then be read inside the game. No payment happens in Unreal Engine itself.