Make in app purchase?

I was wondering how do you set up the purchasing price for the customer with (Make in app purchase node). Do I go to Google Play or Google developers console to set the prices for each buy button? These things look difficult to me. I know that there are some tutorial from Epic on in app purchasing but it’s kinda rocket since deal to me. Don’t like the dark side of UE4. Could some one simplfy these. Thank you!!