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.
@tacotip as mary said you can use to buy boosters, extra moves,lives and in the community there are lots of contests to win free gold bars. Ideal to have when you come to the hard to pass levels