The United Payments Interface (UPI) crossed 10 billion in the volume of transactions in August, marking a significant milestone for the payments service which is not just being used extensively domestically — at least for small ticket transactions — but has also become a key part of India’s foreign policy outreach. Throughout India’s presidency of the G20, it has played up the country’s efforts at creating digital public infrastructure — of which UPI is a key part — and has also explored other nations’ interest to adopt the underlying technologies that power India’s digital public infrastructure (DPI) push, which it…