Yes, you can earn or redeem points for purchases made on other countries’ websites too. You will earn points based on the prevailing points-spend structure.
Note: SGD1 = HKD5
E.g. I am a Hong Kong-registered customer. I happen to visit Singapore and make a purchase of SGD50. Based on the points-spend structure of 1 point for every SGD1 spent, I will earn a total of 50 points.