From 1 April 2022, a S$5,000 nett spend cap on the number of points awarded will be implemented for every shop and dine transaction you made at Changi Airport, Jewel Changi Airport, or on iShopChangi, Sift and Pick, Changi Eats portal.
No, you may not as you have purchased only one item. You will be awarded 5,000 (Member), 10,000 (Gold) and 30,000 (Platinum) points depending on your current membership tier based on S$20,000 nett spending in a single receipt.
If you are a Platinum member, the maximum earned points will be 60,000 (S$20,000 nett spend = 30,000 points + S$10,000 nett spend = 30,000 points) based on the receipt from Store A and receipt from Store B.
There is no limit to the maximum number of points per day/month/year as it is set based on per transaction. As such, you may continue to spend on multiple items within a store or across different stores.