NPCI said that its systems are "working fine" and it is working with the impacted banks to ensure quick resolution
source https://www.thehindu.com/business/Industry/upi-payments-hit-due-to-glitch-in-some-banks-systems/article67819302.ece
source https://www.thehindu.com/business/Industry/upi-payments-hit-due-to-glitch-in-some-banks-systems/article67819302.ece