You can only earn Shopee Coins for purchases made from any sellers on Shopee.
The amount of Coins you earn from a particular order will be calculated based on the order’s final purchase price, minus all discounts and excluding Shipping Fees.
For every RM1 spent, you will earn 1 Shopee Coin.
You can earn up to 100 Coins per order. However, you can only earn up to a limit of 150 Coins daily and up to 300 Coins weekly.
For more information on how to earn Shopee coins, go here