https://www.desidime.com/discussions/what-is-the-best-cashback-deal-for-credit-card-payment?page=3#post_8047520
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If you are paying for non-hdfc card and have hdfc easyshop platinum debit card, you can pay using it on billpay portal to get 1% cashback.
If you have IDFC bank debit card , you can use that to pay credit card bill payments to get 1% cashback (festive offer)
If you have Jupiter account use Jupiter UPI on Amazon to pay credit card bill to get 1% cashback.
Earlier dhani cashback card was also providing 2% cashback on credit card bill payments (not sure if it still is)