https://shop.samsung.com/au/multistore/auepp/westpac_offers_… says:
To access the Westpac Offers Samsung Store, you need to be logged into Westpac Online Banking and click on Rewards and Offers.
With some Google Search, it seems this feature is limited to Westpac Business One users, not to ordinary Westpac users, correct? I can't verify this just by Googling.
Yes . Correct