How do I refund a customer?

I have had a customer over pay and I need to refund them how do I do this?

Read the Guides. This is covered.

I am having trouble finding the guidelines

Click on the Guides link at the top of the Forum home page:

The guides are currently out of date in relation to this.

But to refund customer who overpaid their invoice, simply record Spend money transaction which needs to be categorized to account: Accounts receivable - Customer name