How do I switch credit cards on the account?

Concern moved here to the Billing help section for greater exposure to Comcast corporate employees (The Digital Care Team) for assistance. 

Hey there, user_y98xl9, thanks for reaching out through Xfinity Forums regarding your account and updating your billing information. Here is a link with the steps to update your payment information, https://www.xfinity.com/support/articles/my-account-app-manage-stored-payments. Let me know if you have any additional questions.