Yes, if you are eligible for a refund then you can lodge your return online. Afterpay will be notified and all future payments for that order will be cancelled. If you have already made one or more payments, the total amount paid thus far will be refunded to the credit/debit card that you used to place the order. Once notified, Afterpay will process the refund immediately and send you an email to confirm that the refund has been applied. The bank may take 1-2 business days to refund the money to your card.
Afterpay is currently only available in Australia not in New Zealand.