johncrossley
Established Member
They will either need to use the app or use the website. With just the card number and serial number you'll be able to top up your card, there is no need for an account.
Sure, most people could do that, but there are bound to be some people who don't have a smart phone with them, or have no data left, or some people pretending their phone doesn't work to try and get a free train ride.