Nium, a global B2B payments platform, has announced that it has raised a US$200+ million Series D round led by Riverwood Capital – a U.S.-based high-growth tech investor. Temasek, Visa, Vertex Ventures, Atinum Group of Funds, Beacon Venture Capital, Rocket Capital Investment, and other angel investors, including DoorDash executive, Gokul Rajaram; Chief Product Officer at…