The plug-in supports v3.00 as per description. I did not find any settings about supporting version and it was compiled successfully. I copied the "Presentation\Nop.Web\Plugins\Payments.Robokassa\" folder into the Plugins folder on my NOP server. But when I refresh the plugins list, the plugin is not available. Is there any trick or setting to make it available? I also noticed that the Plugins\bin folder is empty. Should it contain any plugin assemblies?