Poor process design
This app works - at least - and I am able to put money on my daughter’s travel card. However, the whole method is entirely unsatisfactory. You cannot top up the amount remotely (like you could with the Mango card) and ‘collecting’ the amount I’ve added to my daughter’s card (by tapping her card on my phone) is often a bit hit and miss. Somebody made the design decision that users had to add balances directly onto the card, rather than into an account that can be checked at ‘tap on’ time. Poor choice.