We're aware of an issue with Facebook purchases for all King Games and our team is on it. 🛠️ Hang tight while we fix things! You can still enjoy the game, and we'll keep you posted once it's solved.
They are for the Season Mastery feature that some people hsve got in their game @minnaj. Unfortunately not everyone that gets the Season Mastery stars in their game gets the associated festure that allows them to use the stars.