UPDATE 8:45PM - This seems to be resolved now!
original post below
We are currently seeing a lot of declines coming through this evening whereby our cards are getting rejected when customers attempt to pay at some merchants and withdraw from some ATMs.
Other merchants are working, and after investigating with our engineers, we believe this to be a merchant acquirer issue. A card acquirer is a bank that operates a merchant’s card terminal. This error has resulted in card payments failing at terminals operated by a specific card acquirer. We are currently investigating the issue further to see what we can find out.
If you’re having trouble paying by card, we’d recommend attempting to withdraw cash from the nearest ATM (until the issue is resolved). Barclays ATMs appear to be impacted by the same issue, so we would recommend trying an alternative provider.
We are confident that this is not an error with our systems - however, we felt it best to let you all know.
We’ll post again with an update when we have one!
You can also keep an eye on our status page for updates : http://monzo.statuspage.io