An unpaid enterprise invoice can begin with something as mundane as a missing purchase order. Fixing it may require a billing contact, a portal submission, and weeks of follow-up across departments. Stuut is betting that AI agents can carry that work through to payment, and investors are backing the company with a new $52.5 million Series B. Announced on October 7, the round was led by Insight Partners, with participation from Andreessen Horowitz and M12, Microsoft’s venture fund. It brings the…