There is a new portal for topping up yourPCAS (Print, Copy and Scan) account with a debit/credit card. The new address is https://www.oxforduniversityshops.co.uk/pcas.
The username is the 7 digit barcode number on your card. Your password was initially set to be your date of birth in the format ddMMMyyyy. For security reasons you should change this to a password of your choice at https://register.bodleian.ox.ac.uk.