Looks better than it is. Not worth 400kr/year.
As a general credit card, refunder pay works just fine. However, their customer service is less than desireable.
Like any other credit card they put the minimum amount you have to pay on the bill. But unlike other credit card companies, they refuse to put the maximum amount even when you ask. This means that if you accidentally forget to copy over the correct amount, every month, they will start charging you interest.
This is a nasty business model that's simply there to make a quick buck out of customers.
Combined with the fact that their bonus program barely gives you any extra bonus compared to free cards such as Norwegian and Carpay, they are just not worth the 400kr a year.