I am using an Amazon pay icici credit card, and I paid my education fees of 100k on 18th November, thinking of getting 1% cashback but the amount deducted is 101200 by the merchant ccavaneu by hdfc bank payment gateway on the university portal, although I got 1% cashback that will be 1012 but still I ended up paying more fees, and I am shocked that the in payment gateway it was clearly mentioned no extra charges for credit card and at the time of transaction also I got a request for 100k only, if anyone help solving this query it would be really helpful.