Which credit card gives the highest cashback on online shopping?

Two things nobody tells you: (1) GST is charged on the annual fee, so a ₹1,000 fee becomes ₹1,180. (2) Reward points usually have an expiry of 2-3 years. Set a calendar reminder to redeem before they lapse.

Yes the rewards sound amazing in marketing, but the redemption catalogue is full of products at inflated MRP. The statement credit redemption is almost always the best value. Skip the merchandise, skip the flight bookings, take the cash.