I know OPSM can be a massive rip but there can be good deals to be had.
20% off sunglasses is pretty good when /if they're not overpriced to begin with.
Plus if you're a Sydney CBD person you can use the current AMEX Vogue $20 credit with $50+ spend deal.
The world square location had a split limit of 2 credit cards per transaction. i.e. if you have multiple credit cards enrolled in the Vogue offer you can use up to 2 of them.
So if a participating amex retailer can split pay a purchase, we get the multiple cash back? I always thought that it's to be used once for each retailer.