Samport is one of the most popular suppliers of payment solutions and terminal products throughout the Scandinavian region.
This plugin connects you to their Hosted E-commerce solution.
Once you have applied for a merchant Account from Samport you will have access to their WebManager where you will find your configuration data you need for the Virtuemart plugin configuration.
The plugin has full security checks for post back and logging so you can check what result info Samport has posted back to your Virtuemart shop.
The http://www.gjcwebdesign.com/eximg/samport/GJC_Samport_Payment_Virtuemart_2_Plugin.pdf contains instructions for manually checking the operation of the post back system (How Samport informs your shop that the payment was successful or otherwise and confirms or declines the order)