First post.. Haven't tried yet, let me know if I have made mistakes
I believe that you can also do pay and points only caveat is you have to pay in USD, so 28degrees/bankwest/citibank card with zero conversion rate recommended
From the email
Spoil yourself with shopping and dining experiences at Westfield. Enjoy 10% off your Westfield Gift Card when you buy yours by 23 May.
Spend your gift card at over 8,000 retailers at Westfield shopping centres across Australia, including brands like Apple, Target, Rebel Sport, Harvey Norman, Toys R US and Zara plus a wide range of dining and entertainment experiences.
Choose from 4 denominations (AUD 25, AUD 50, AUD 100 and AUD 250) and enter the code WESTFIELD10 at the checkout for 10% off your Westfield Gift Card.
Enjoy shopping!
The $25 voucher with points and pay has a minimum points component of 4100 points, so no good for anyone planning on joining just to take advantage of this deal. Hopefully there are some Emirates members here who can use this deal though.