Hi there,
According to AltaPay, their gateway supports Icelandic. However, the DynamicWeb implementation doesn't. Can that be added? Looks like it's just one extra line in GetOptions of AltaPayCheckoutHandler.cs with "is" as the language.
Note: their documentation doesn't specify this yet, but their support department communicated the following: "We do support Icelandic language, however it appears that this was not reflected properly in our documentation. So you can continue with the integration and we will make sure to add Icelandic to the list moving forward."
Thanks!
Imar