You do not have to do anything since all Fave cashback will be automatically deducted on your next purchases, regardless whether it is a FavePay transaction, or purchasing for Fave deals and eCards. Kindly take note that only once your Fave Cashback is used up/ expired will you be charged to your selected payment method!
For partner cashback (cashback received from Fave Pay transactions from the particular partner), you can only use them by making a FavePay transaction at the specific partner. The cashback will be automatically deducted from your total bill when you use FavePay.
All cashback can only be utilized before their expiry date, which you can check on by going to your app > ME tab > My Cashback, and by clicking on each of your existing cashbacks.