Pretty much 20% off for your next $1,500 of purchases. $6,000 minimum credit limit is the only barrier to entry, otherwise the criteria is pretty easy as you can spend the money any time in the first 3 months.
From the website:
"Eligible applicants must meet the spend criteria within 3 months of the date of approval. The date of approval of an application is the disclosure date specified in your Letter of Offer. Eligible purchases includes purchases made using your account but excludes specific purchases as set out in the ANZ Credit Card Conditions of Use (PDF). Excluded purchases include, for example, fees, cash advances, cash equivalent transactions, balances transfers, premiums paid for ANZ credit card insurance, transactions for gambling or gaming purposes or reversed or refunded transactions and will not qualify. The $300 will generally be credited to your ANZ Credit Card Account within 3 months of meeting the spend criteria. The $300 credit will be applied to the purchases balance and does not constitute a payment under your Credit Card Contract with ANZ. You will not be eligible for $300 back if your ANZ Credit Card Account is cancelled, suspended, transferred, or you are in default or breached the ANZ Credit Card Conditions of Use (PDF)."
Edit: some people have issues accessing the deal (i.e. clicking apply and the the website saying that the offer is no longer available). Some solutions have been to search for the card organically (not using the post link) or using a different browser or device.
Edit: The page is now 'down' for maintenance not just for this card but for their other cards too. I'll report again if I see the issue resolve.
Edit: it’s back online.
Got the $300 bonus. Thanks OP.