3 places to register PRODUCT_ID?

Unity Services
1

Ok, I understand that you need to submit InApp Products list on AppStore and Google Play Store.
For example something like Gold50, Gold100, NoAds etc.
But what is the reason we have to register Products in Unity Dashboard InApp Purchase section?

2

Only if you want to advertise your own products within your app! If you don’t plan to do any advertising, then you don’t need them in the Dashboard also. We are working to steamline this process https://docs.unity3d.com/Manual/IAPPromo.html

3

Sounds good. Thank you.