The answer is no on both accounts. I don't know why you would want contactless payment, but that is another story.
Firstly contactless payment is designed for small transactions. Westfield use Tyro Payments, and AFAIK they all use the Xenta terminal which doesn't allow for contactless payment. If they did have the newer terminals, then there would be a $100 limit anyway.
The Westfield XS cards are EFTPOS cards. No EFTPOS card has contactless payment*. You must swipe the card and use the PIN on the back of the card for every transaction.
* The only exception is VISA and MC cards issued by a bank, in which case they aren't really an EFTPOS card, they are a VISA or MC which has a "savings" account, which works on the EFTPOS network. In this case, contactless payment only works for credit transactions, not EFTPOS / Savings transactions.