DO NOT USE any RuPay credit card with Flipkart UPI now. I had paid for an order with HDFC RuPay CC UPI thru Flipkart UPI, and returned the order. But the UPI refund to my card failed, and Flipkart shows the option to add bank account.
However, they are so shitty, instead of using the standard IFSC database, they are using crowdsourced data. It didn't show both my SBI and HDFC branches there. In fact, my SBI branch was opened in the 1970s! No wonder why I don't want to shop from Flipkart.