Make sure you are running the latest version of our game and are connected to the internet.
Also make sure you have read and accepted any new Terms & Conditions your App store has, as this will prevent you from making purchases, even if you already have funds in your account.
Please also note that all purchase transactions are handled directly through your App Store and not by the game itself.
If you'd like to check or change your payment information, you will need to make this change in your App Store account. If you have credit available, you may need to have this updated on you account as well. This can be done either directly on your device or through the service provider's web site:
Apple Store (iOS) support:
Google Play Store (Android) support:
Amazon Store (Kindle) support:
Facebook Payment support: