Your refund will be credited into the same payment/account your payment came from.
AfterPay
If you placed your order using AfterPay, when we process a refund for that order we notify Afterpay of the amounts to be refunded, which is then processed on their end. The refund amounts are taken off the last payments first. If at least one payment has been made in relation to your purchase, and the refunded amount is greater than the amount outstanding, the difference between these amounts will be refunded to the card that is linked to your Afterpay account. It may take your financial institution up to 10 business days to refund the money to your card.