Android In App Billing make a managed product free

Question

In my app i have several managed products which have a certain price. In the release week I want to make some of them free of charge. As the minimum price on Google Play Developer console is 0.5€, I'm not sure how to make those products free of charge and at the same time save its SKUs to the Google Play servers (as it happens on default purchase flow). I want that, because a user may delete the app and reinstall it later.

Is that even possible?

Answer 1

See In-app Promotions — Where Developers can create promo codes which users can redeem for content or features.

Promo codes let you give content or features away to a limited number of users free of charge. After you create a promo code, you can distribute it subject to the terms of service. The user enters the promo code in your app or in the Google Play Store app and receives the item at no cost.

Answer 2

You cannot change the price of an in-app product once it is published, and you can't sell an item for free. You will have to implement this yourself, maybe by keeping a record of SKUs that a user has access to that is separate from what Google Play gives you. When a user clicks "buy" for a product, pays for it, and consumes it, then add that SKU to the list. If you want to offer a free product, simply add that SKU to the list as well without going through the IAB flow.