Promo codes allow you to give away your paid app for free. They are mainly used for sending your app to journalists or bloggers so that they can review your app at no cost to them. You can also send them to your friends or reward those who made some contribution to the apps development. Developers can generate up to 100 promo codes per version. Each code expires 28 days after generation or when you release a new version of the app, whichever comes first.
