New Delhi, July 10 -- Prime Minister Narendra Modi and Namibian President Netumbo Nandi-Ndaitwah on Wednesday explored ways to strengthen ties in defence, trade and digital technology, with the two sides announcing the African nation will soon roll out a digital payments system based on India's Unified Payment Interface (UPI). Namibia was the final destination of a five-nation tour that also took Modi to Brazil to attend the Brics Summit. He is the first Indian premier to visit the country in 27 years. After a ceremonial reception at the State House in Windhoek, Modi held discussions with Nandi-Ndaitwah on strengthening cooperation in defence, maritime security, digital technology and UPI, agriculture, healthcare, pharmaceuticals, energy an...