Bonus Cashback usually comes with a set of requirements. This information can be viewed when you click on the bonus entry ( it will reveal a drop-down menu). You can refer to an example of the criteria as per the screenshot below:
1) You have yet to "Earn S$10 confirmed Cashback from purchases"
2) Your friend yet to "make a purchase of S$25 and update his/her withdrawal details"
3) You have yet to "Earn S$10 confirmed Cashback from purchases"
Once all the requirement is fulfilled, the bonus will be redeemable in 5 working days.