Amex looks to have started as the newest cashback site.
Looks to be a few decent deals, e.g. 12.5% cashback off the iconic (certain categories), surfstich, JBL, jd sports.
Register an account with MyAmexShop and link your American Express Card to begin shopping
Click through to your favourite stores and shop using your linked American Express Card.
Be rewarded with credit for your eligible purchases.
See List of Supported Stores
https://myamexshop.com.au/all-stores/
You wonder if this means you either get this or cash rewards but obvs not both?