https://developer.apple.com/app-stor...ew/guidelines/
In the link provided if you scroll down to point 3.1 about payments it states the following: Apps offering “loot boxes” or other mechanisms that provide randomized virtual items for purchase must disclose the odds of receiving each type of item to customers prior to purchase.
The first thing that comes to my mind is presents and I am almost certain that this falls under that exact category.