The products you are trying to purchase in the game are sold through the Google Playstore or the App Store and as different players have different payment methods, there may be multiple causes of problems.
Let us guide you with the methods below:
[How to resolve payment failures]
1. Completely restart the game, clear cache and try to make the payment again with a stable internet connection.
2. If you see a problem with your app market store and your issue is not resolved:
3. If the problem is due your payment method / payment provider, please contact the payment company (PayPal, credit card issuer, bank etc)
■ If the issue has to to with a micropayment payment limit, you can check your limit by contacting customer service of your payment company.