Does the IAP need to be "visible" to the Apple Review?

I have a game that unlocks some levels later in the game where the user reaches a certain point.

There is no shop button or something similar. However, this means that the Apple Review probably won't "see" the IAP.

Is this okay with App Store guidelines or does need to be some sort of "shop" where you can (also) purchase the IAP from there?

Thank you :)