To update your credit card details, please:
1. Log into your client area: https://portal.my-tss.com/clientarea.php using your billing email address and password.
2. In the upper right corner, you'll see a "Hello, YourName!" Click on that, then click on the "Manage Credit Card" Dropdown option:
3. You may view existing credit card details from this page:
4. Or if you scroll down a bit, you'll see an option to enter new card details. Simply modify the information and click save changes: