Seems like a great offer from Amazon :)
(a) Shop on amazon.com.au or the Amazon mobile app using your Zip (Zip Pay or Zip Money) account (“Zip Account”) during the Offer Period to get 10% credit back up to a maximum of $50AUD (“Offer”). The 10% credit back amount will be credited to the applicable Zip Account within 5 business days from the date the Eligible Purchase amount is debited from your Zip Account. The Offer is applicable during the Offer Period for any number of eligible purchases using your Zip Account. You may spend more than $500AUD during the Offer Period and still be eligible for the Offer, however the 10% credit back is limited to a maximum of $50AUD.
(d) For the purposes of this Offer, “Eligible Purchases” refers to any items available to purchase on amazon.com.au or the Amazon mobile app (AU marketplace) except:
i. Digital purchases including Ebooks, apps, etc;
ii. Subscription purchases including Prime, Prime Video, Audible, Music Unlimited and Kindle Unlimited;
iii. Purchases made at amazon.com (USA) or any other non-Australian Amazon site, mobile app marketplace or location;
iv. Subscribe and Save items.
As always, enjoy!