A refund puts money back into a customers account. It allows the record of the purchase to remain and shows another for the money being returned. Voiding a transaction removes the original purchase entirely.
To refund a transaction, click Customers > Customer List > search for the customer & click their name.
From their profile, click Activity > Payments > locate the transaction > click the dropdown > click Refund (in money or Momence credits).
To void a transaction, from the customer profile click Activity > History > locate the transaction > click the drop down to the right > click Void purchase