Moved to Forum: Original Link
Got an email, not sure whether it is a targeted offer. Email states:
"As a valued 28 Degrees Platinum MasterCard customer, we want to reward your spending everywhere, whether it is paying bills, buying groceries or shopping at international stores online or abroad. So we'll give you $20 account credit, if you spend the equivalent of $900 AUD anywhere by 31 August 2015".
There is a link in the email to register for this offer. I presume participation wont be granted without registering.
Works out to a ~2.2% cashback