Magento Open Source, 1.9.x

Credit Memos & Refunds

After an order has been paid for and invoiced, all of the order, or a portion of it, can be refunded by issuing a credit memo. A credit memo differs from a refund because the amount of the credit is restored to the customer’s account where it can be applied to future purchases, rather than returned to the customer as cash. In some cases, a refund can be given at the same time that a credit memo is issued, just as payment can be made at the time of invoicing.