Refunds can show in a few places depending on how your paid.
For a card or ApplePay payment, It can take up to 7 days from receiving your refund confirmation email for the refund to hit your account.
For some banks and credit cards your refund can show on the same date as the original purchase, sometimes it can also show as the same transaction.
If you paid via PayPal it can take up to 48 hours from receiving your refund confirmation email for the refund to show in your account. If your bank account is linked to your PayPal account it can take a further 14 days for this refund to hit your bank account - this is due to PayPal processing times.