... huh? Or I guess this is sarcasm? This response hardly seems warranted, given it’s just a festival exclusively accepting swish. I never use swish except for sending money to friends, so I don’t think it’s widespread for businesses. Contact less credit card is easier than everything, including cash.

The Danish version, MobilePay, is fairly widely accepted by small and some medium businesses.

Very small businesses might only accept MobilePay or cash (e.g. come and see an obscure band perform in Copenhagen, the ticket, cloakroom and bar might have these choices.)

Larger places offer it as an alternative. The canteens at Copenhagen University, for example.

How did you type those knots over a? I'm on windows.

Swedish has three extra letters in its alphabet, åäö, so Swedish keyboard layout has 'å' where american keyboards has '['. You can type them by switching to Swedish layout and pressing [.