This page describes how to solve the issue when you receive an error message and fail to add a credit card to cybozu.com Store.

Clear your Web browser's cache, or use a different Web browser.
As for how to clear your Web browser's cache, refer to the following pages.

• For Google Chrome
• For Microsoft Edge
• For Mozilla Firefox
• For Safari

If none of the above solutions solve the issue, contact your credit card company.
Also consider using a different credit card or changing your payment method.
Changing the Payment Method