Collections is less of a grinding problem and more of a search problem: find the few invoices that move the number, and put your best effort there. For a typical business, two-thirds of the money they're owed sits in 10% of invoices. Full piece on how Stuut uses agents to help B2B companies get paid the money they're owed: https://www.a16z.news/p/what-it-takes-to-get-paid(a16z)