Comment by vee-kay

UPI & RuPay are not mandatory, they are completely optional.

Citizens and travelers in India can pay by cash, card, UPI or NetBanking to make offline or online payments. A new or existing customer or a Bank can randomly get (and can anytime request for a replacement card) to Bank to get the ATM/Debit card as RuPay, Visa or MasterCard card. So RuPay card is optional too.

But nevertheless, the technology stacks behind UPI and RuPay have been built to be so versatile, scalable and robust that they now account for 85%+ debit & payment transactions in the nation! India is rapidly heading towards a cashless economy!

Due to the interoperability, scalability and resilience in the technology stacks for UPI & RuPay, these brilliant solutions are now being sought after by other nations, who are eager to buy and leverage these tech stocks to implement their own branded payments systems that will replace Visa, MasterCard, Amex, etc. in those nations.

e.g., UAE has tied up with NCPI (Indian government organisation that implemented and manages UPI & RuPay) as a tech license deal and UAE has already started its own implementation of RuPay, which it has branded as Jaywan. So the Jaywan Debit cards are alternatives to debit cards from Visa, MasterCard, Amex, etc. in the UAE.