https://www.theregister.co.uk/2019/08/27/tfl_oyster_cards_plain_text_password_form/

Transport for London is looking at ways to improve its processes after a Register reader queried why he was being asked to write down his password on a paper form for railway staff to read.

London-dwelling Alfie Fresta wanted a National Rail travelcard discount added to his London Oyster card so the discount would work automatically with his pay-as-you-go smartcard.