Please check the following.

• Make sure that your network connection is stable. If there is a problem with the current connection, give it some time and try again or try a different connection.
• Restart your device.
• Make sure that your payment information is registered correctly and that the expiration date of your payment method is valid.
• Make sure your past payments have been completed successfully, regardless of the application.

If you are still unable to purchase, please contact us by clicking →[Chat with us] under this FAQ page in the app → [Purchase] → [Other Purchase Troubles].