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.
http://bitshiftweb.com/nopcommerce-firstdata-global-gateway-e4-payment-plugin