In such a scenario only cash works.
Re:A digital payments revolution in India
by abhayhegde on Saturday May 20, 2023 @11:21PM
(#36017742)
You're talking about all hell breaks loose kind of situations and anything basic would be a concern then, let alone UPI not working. There's no universal solutions for such situations. That doesn't mean the country shouldn't be too dependent on UPI.
Most shops in India do not have backup power provisioned.