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If this move is successful, it could also open the door for Facebook Libra.

How? And what can Libra offer? In India, these payments have to land in a Rupee account held in a bank.

UPI is something like a framework. All these apps access the UPI payment system. They do nothing on their own.

You can pay with Google Pay/PhonePe/Paytm/Amazon/Whatsapp with the same QR code.

It's like XMPP for payments.

Libra has no chance of getting into India. UPI is way too popular now.