https://www.desidime.com/discussions/thought-about-credit-card-bill-payment?page=1#post_8824074
UnderNation
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Which Credit Card U Have ?? Will Tell Instant Method For You
Just imps the amount to your card for instant settlement .
Thing is card issuer bank is notified of payment irrespective of mode. UPI/IMPS is instantly settled while other modes take time. Banks mark a credit but finalize and post only after settlement. So other modes take time. Some banks notify instantly on a payment, while others not, how their software and systems are configured that matters.