Have a Samsung phone, and the only way (IIRC) to make contact less payments with that - if you bank with Barclays - is with the Barclays App. Which worked just fine until the other day.
Paid for some groceries, but shortly afterwards, it wouldn't work when buying petrol. Or later the same day at another store.
Looking at the app at home it said there was a problem, and to use the link on it to phone their help line. Which I did, with no result. tried again later, and the very helpful chap could see there was a problem, but couldn't resolve it.
Tried uninstalling the app and reinstalling. Same problem.
Then installed the Barclaycard app. Which apart from the name and icon appeared to be identical. Set it up using exactly the same data and passwords etc, and that does work for contact less. But oddly would only allow me to select my debit card (same as the other app) and not my Barclaycard. And configured exactly the same as my Barclays App which is still showing the problem.
It's a very strange world.