Is there a way to give promo/coupon codes for people to download your app for free?

Question

I need a way to share my app to allow people to download it for free with a coupon code or promo code or checkout code. I would like to post the code to a board, and invalid

Answer 1

I think I have a part-way ok way to do it. I use the licensing service, which is not terribly hard (10 times easier than in-app billing), and embedded an expiration time into my app, and post the debug version on a web site. Before the expiration, it ignores the license server response. After the expiration, it reports "Unlicensed App" with the option to purchase.