Dunning & Collections platforms automate the recovery of overdue receivables — orchestrating payment reminders, escalation sequences, and collector workflows to reduce bad debt and accelerate cash recovery. Core capabilities include automated dunning email sequences with configurable timing and escalation, collector task management and prioritization, customer payment portals, promise-to-pay tracking, aging analysis and risk scoring, dispute management, and integration with billing and ERP systems. The category spans standalone collections platforms (Tesorio, Gaviti, Upflow, Kolleno) and collections modules within broader AR automation suites.