I have one question, we one page checkout and recently we update the Autorize.NET plugin because the Autorize.NET requirement but now we getting error http://www.nopcommerce.com/p/2320/authorizenet-payment-module.aspx when customer enter different address than credit card have in file. There is no order created but money take out from client. Can be related with this plugin? I see it have in configuration section Payment method update and there is just Country ID.
I don't believe that this has anything to do with the plugin as our plugin is not responsible for creating orders or charging money from the customers. After clicking the "Checkout" button all the logic is handled by nopCommerce code and the selected payment provider ( Autorize.NET plugin ).
Hope this helps!