Made my changi rewards card @ changi airport terminal 2 sprin-cass pte ltd. #026-013 departure check in hall north
Basically got the card number there but actually registered through the ichangi app. After that you actually get a digital card. Which is like a qr code they can scan and you don’t need to carry around your physical card. Allows you to have 7% discount (which is like gst) then also lets you earn points.