Not as good as SHOPBACK's 100% cashback ($10 capped) + Westpac 10% bonus ($15 capped) but we dont know their terms with use of domino's pizza codes for order to stack with cashback.
With cashrewards, benefit is uncapped cashback (so good if you ordering big amount, (already met $10 ish or so from SB order), or like want to not risk declined cashback due to usage of promo pizza codes)
expires wierdly at 4pm instead of typical midnight too
I think I'll take my chances with Shopback's 100%