Authorize.net now supports payments in 33 European countries, in 4 supported currencies:
Effective Systems, LLC has updated our nopCommerce AuthorizeNET SIM plugins to send the primary store currency code to Authorize.net. Our most popular plugins for v2.8 and 3.2 are completed, and other versions will be available soon.
Please see our product details for more information and this post on Authorize.net for additional details.
Important things to note:
A single Authorize.net gateway account will only handle one currency code. Multiple gateway accounts are required to support multiple currencies.
nopCommerce versions 3.0 thru 3.2 that support the multi store environment only support ONE primary store currency across all stores. This is set in the admin panel under Configuration, Currencies.
The selection of a currency code that a customer sees on the site only displays the price to them in that currency. When the Authorize.net payment form appears, the price will have been converted to the primary store currency code.