On SAS flights you can pay using credit/debit cards.
EuroBonus members can also use their points to pay onboard. Just let the crew scan your digital EuroBonus membership card which you find in the SAS App. It is not possible to combine points and credit card in the same purchase.
Starting April 29th, 2020 SAS will no longer accept cash payments onboard. This is due to a decreasing number of passengers paying with cash, industry standards and digitalization.