Rewards, vouchers and offers

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Like any other person I have also started using one of the online payments named google pay. Interestingly this apps sometimes gives rewards and all rewards are online offers like 40% ,50% or 70% OFF in purchasing cosmetic items, electronic devices so on. These offers are not even required by me, which later found laying unused and invalid to apply. I don't know what could be done with these offers. Are there any other alternative options for this ? Instead of these offers, they should have given rewards like Rs.10-15/- I would have been happy in using their services. What kind of complement is that?