My FirstData Global Gateway e4 plugin is now available. It supports Authorize, Capture, Refund, and Void. The FirstData API doesn't support recurring payments, unfortunately. There is a free trial available and license keys for single URL or full domains.
NopCommerce 3.00 is available now and I will be adding versions for 2.8, 2.7, and 2.65 over the next few days. If you would like one for any of the earlier 2.X versions just let me know.