Similarly to other online banking apps, it would be very useful if you could make a credit card payment by just entering the 16 digit number.
I am sure I speak for everyone in that I don’t know the sort code and account number of any of my credit cards, and I would worry about finding and entering the correct ones.
That’s great to know I was lucky as Mbna sort code and account number was in the help page of the app for me to make payments. Then did a test payment to make sure it worked.
The system which most banks use is the BACS Biller Update Service, it’s bascially just a centrally managed database of verified account information which banks and FS can use to provide biller lists to customers - https://www.bacs.co.uk/Services/Pages/BillerUpdateService.aspx
This would be a pretty nice thing for Monzo to integrate in and I’m sure they could probably do some sweet automation and user experience stuff with it!