Are you canceling all of it?

A void is always for the full amount. Releasing part of a payment is a different operation, and not every processor offers it.

Your answers so far

How did the customer pay?: By card. Change
Has the payment settled?: No. It's authorized or captured, and its batch hasn't closed. Change

Choose one

Yes. The whole payment shouldn't happen. A duplicate order, or a customer who changed their mind.
No. Only part of the amount. One item out of stock, or a discount applied after the order.

What to build

What this means for PCI

This is guidance rather than a compliance determination. Which questionnaire you are eligible for depends on your full environment, so confirm it with your QSA or your acquirer before you rely on it.

Worth knowing

Where to go next

Start over