Yea, I’ve used it a few times. As far back as January 2018, at the one at Trafford Park in Manchester.
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I contacted Costco a while back to check - they don’t have Mastercard on their signage because (before Monzo and Starling) the vast majority of Mastercards were credit cards so I think it was to reduce confusion.
I always use my Amex at the Costco petrol station, but I use my Monzo card in store all the time with no issues.
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Can confirm this is a problem with Swiss being stupid. Not only do they not let you pay with a Mastercard Debit card, they also force you to convert CHF into another currency, rather than pay in CHF with your card.
BUT! Thanks to Enid’s suggestion I looked up my flight on Lufthansa and managed to pay with my Monzo card. Thank you!
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