Got a notification from EASI earlier, applicable only to those who have a Mastercard BUT have not added or paid using Mastercard in EASI app before.
Full T&Cs in the link attached. Key points as follows;
* Only for those who add and pay using Mastercard for the first time in the app
* Coupons valid for 30 days
* Coupons will be given within 60 minutes of adding and saving the Mastercard details
EDIT - just realised from Facebook replies that you can only add a card during checkout, which means you have to make one order first and get $30 coupon for subsequent order.