If your payment keeps failing, you may solve the issue by deleting cache and data.

Please refer to the following steps to delete cache and data, and try again.

✔How to delete cache and data
* Please check if your account is linked before proceeding.
  If it’s not linked, your game data may be lost in the process.

✔On Google Play
1. Go to Settings of your phone.
2. Tap on Apps.
3. Select the game.
4. Select Clear Cache/Data.
5. Delete the game.
(Please check whether your account is linked or not before deleting.)
6. Reinstall the game.

✔On App Store
1. Delete the game.
(Please check whether your account is linked or not before deleting.)
2. Go to Settings.
3. Tap on Safari.
4. Select Clear History and Website Data.
5. Reinstall the game.

If the problem persists even after following the steps above, please contact Customer Support with more details.