Refund vs void
A void cancels a transaction before it settles, so nothing ever moves. A refund reverses one that has already settled, so money goes out. Which one applies depends on timing, and whether counter staff can do either on the device — rather than raising a support ticket — is a practical thing to test on a demo.
Why it matters to a merchant
One of the few places where a staff-training decision has a direct financial effect. A void before the batch closes and a refund after it are different operations with different consequences for the customer's statement and for the merchant's books — and the window between them is short. Teaching counter staff which one they are doing, and by when, is worth more than any policy document about it.
Where this comes up
Pages on this site that deal with this in context:
Related terms
In this section: How a payment moves