Check so that you can check out correctly with another currency than SEK

[andyjohansson]

Invoice:
Test to checkout with other currency than SEK. Should be that currency in all declarations of the order.
Card:
Test to checkout with other currency than SEK. Should be that currency in all declarations of the order.

Also check so that the Invoice fee is displayed and handled correctly. It should be converted to the currency used in the checkout process.