Do you have a test card?
Any QuickPay account is able to run in two so-called "modes". A "production mode" where all transactions is passing the acquirers.
When the system is in "test mode", no transactions is passing any acquirer. One can therefore test and develop without fear of abusing his own or someone elses credit card.
In test mode you can provoke error response by sending a card number containing a letter, for example
4571000000000001 | 09/12 | 12a
Then the card is declined, even though running in test mode.
A successful response can be obtained by using the following card information:
4571000000000001 | 09/12 | 123
If you want to test a flow with a currency other than DKK, you can try the following cards:
5527320000000005 | 12/18 | 580