Promo codes for in-app purchases?

[BlueBird]

We're adding in-app purchases to one of our apps, and we'd like to be able to give free copies to some people (reviewers, etc). Since Apple doesn't have a mechanism for doing this, we were going to implement a system ourself, along the lines of this system.

I have two questions:

1. Does Apple allow apps to implement their own promo code system for giving people free copies of in-app purchases?

2. Is there a simpler approach?

Thanks in advance,

BB

[betterlee]

also interested in this issue.