Bought something online - about 500 quid - from a pretty large well known company. Filled in all the usual details. On the PC.
Paid by Barclaycard.
Said it needed authentication and gave me a choice of how - I chose the Barclays App.
To get into my phone needs my fingerprint. And again to get into the Barclays App. It then asked for (I think) a 5 digit code. And no idea what that is, as I don't remember ever using it.
Very odd. One of the other authentication choices is an SMS sent to the same phone with a code. And I can access that from the phone without needing any additional code. Or even my fingerprint again.