It's important that your online shop's payment gateways are ones that Danes are used to
The payment gateway you use on your online shop is certainly not irrelevant. Some of the things that are important are:
It must be stable - this means that it must also run during peak periods like Black Friday.
It must work on all devices - this means also on mobiles and tablets.
It must support Danish conditions (i.e. be in Danish, accept Dankort and MobilePay).
It should preferably be something Danes recognize.
Shoporama has integration with Quickpay, OnPay, Epay, Mollie and PayPal.