Amazon gift card - 5% Cashback SBI Cashback Credit Card:
Website is shared by @Rahul Gulati
Update - @Rahul Gulati already purchased 30k Amazon gv (seems there is a limit, doesnt allow to purchase more than 30,000), 80,000 Tanishq and 1L Tanishq Diamond gv (read comment section for all order screenshot proof).
Another Update - MCC code - 5399 which is eligible for 5% Cashback on SBI Cashback credit card and HDFC Swiggy Credit Card (But MCC Code verified with only SBI Cashback credit card and IDFC Credit Card)....
You can try using the site mentioned in the above thread.
Please do go through the thread once if you can. Have personally used Swiggy and gotten a 5k voucher. And I think people seem to have bought for over a few thousands / lakhs.