Thanks scomargo - so the discounts are roughly equivalent to a Carrefour membership card.
The relevant web page is I guess this one: https://www.cathaybk.com.tw/cathaybk/card/card/costco/index.html
店內多利金回饋 1%: so as you said, 1% for points inside the store.
店外多利金回饋 0.5%: 0.5% for points with purchases outside the store.
And a bunch of other special stuff I’m not sure I understand. It looks like there are some hotel discounts, and gas discounts, and train discounts?
Ha … so at 1,200 per year for membership, I’d have to spend 120,000 to cover it with points? At the moment that seems unlikely. Do they sell Apple computers? I want to get a new iMac when/if they’re ever updated.
I wonder if there’s an annual fee for this credit card. I really should have asked my wife about this when I was filling out the forms and she was doing all the talking to sign me up.