A new customer is defined by Surfshark, and nothing to do with your TopCashback AU account. Simply use a new email address at their end, the same TopCashback AU account as always, and you're good to go.
Click Get 99% cashback and buy - don't click away to other sites looking for codes and don't use any 3rd party plugins.
(Referral solicitation removed — Mod)
A tip from comments in previous posts is to select a country with no GST to save further at checkout as GST is ineligible for cashback.
And finally please remember you have the safety net of Surfshark’s 30-day money back guarantee should tracking fail. All the best :)
The above is mostly from TA but same applies for TopCashback, so i modified the relevant part.s
Worth visiting the topcashback AU ozbargain store page before creating a new account.
https://www.ozbargain.com.au/deals/topcashback.com.au