I know this info is highly protected, so I'm not sure if it's possible, but, could a page be designed where the customer is able to see the last 4 digits of their card, e.g. ************1234, and have an option to update it, maybe via the checkout API? Or, is this something that can't be done, for security reasons?
The clients want a custom page with this information.
It's not a problem either way, it would just be good to have this answered so I can let a client know whether it's possible.