I think 'UPI Nepal' will soon go live -
government.economictimes.indiatimes.com
Indian companies will also enter into Nepal's market - The likely agreement between the two countries will not just enable Indian tourists to conduct digital transactions in Nepal using Indian e-wallets like BharatPe, PhonePe, Google Pay, and Paytm but the same can be adopted by Nepalese citizens.

UPI backed ‘scan and pay’ digital payments ecosystem to make foray into Nepal - ET Government
Upi: The announcement in this regard is likely to come during the maiden official visit of Nepalese Prime Minister Pushpa Kamal Dahal ‘Prachanda’ to India between May 31 to June 3.
Indian companies will also enter into Nepal's market - The likely agreement between the two countries will not just enable Indian tourists to conduct digital transactions in Nepal using Indian e-wallets like BharatPe, PhonePe, Google Pay, and Paytm but the same can be adopted by Nepalese citizens.