Bank feeds stopping for credit cards is a common occurrence. This can be due to the credit cards expiring or being replaced. Banks can't send these details to Xero without your authorisation, which is why the bank feed stops.
A new application form (or applying through internet banking depending on your bank) will need to be filled out and sent to Xero to be processed.
Contact firstname.lastname@example.org or call 0800 555 024 for assistance with getting your bank feeds back up and running.