Check out how this company called Flyshot does it -- create a new IAP as a promo code on AppStore connect
tanyasardana
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Post
Replies
Boosts
Views
Activity
The reduced priced promo could would have to be created as a new IAP on AppStore connect. It's easier this way as the redemption happens in-app -- check out how the company Flyshot does it