Once logged into the NMI gateway, refunding a sale through the Virtual Terminal is easy. Remember – if you are working with a transaction you ran today, you’re better off voiding!
Voiding “cancels” a sale, whereas a refund is a separate, offsetting negative sale. If possible, it’s always better to void than refund.
First Data provides an easy-to-use online, interactive Terminal Demo so that you can quickly see how to perform common functions on your device.