How to survive yesterday’s Mastercard outage?

It was a card acquirer outage which is an external problem with the shop. Nothing you can do with a 3rd party issue, it’s as likely to affect Barclays as it is Monzo or both at the same time. As this was MasterCard it’s probably best to have a back up Visa card and visa users to have a back up mastercard. There’s a couple of topics on last nights shenanigans