You can have multiple credit cards under the account. Here are the steps to update the card:

1. Go to the Workspace/account for which you want to change the credit card.

2. Go to the settings page. Navigate to the Billing and Usage-> Payment and Invoices section.

3. Click on Manage. On the next page, you can add a new credit card by clicking on + Add payment method.

You can also remove the payment method or set the default card by clicking on the three dots next to the card.