Explanation:

Bhutan is the first country to adopt UPI standards for its Quick Response (QR) code, and the first country in our immediate neighbourhood to accept mobile based payments through the BHIM App.

• It is also the second country after Singapore to have BHIM-UPI acceptance at merchant locations.
• Bhutan will also become the only country to both issue and accept RuPay cards as well as accept BHIM-UPI.
• Bharat Interface for Money-Unified Payments Interface (BHIM-UPI):
• BHIM is developed by the National Payment Corporation of India (NPCI).
• It is an initiative to enable fast, secure, reliable cashless payments through the mobile phone.
• BHIM is based on Unified Payment Interface (UPI) to facilitate e-payments directly through banks.
• It is interoperable with other Unified Payment Interface (UPI) applications, and bank accounts.

Hence option 1st is correct.