Invoicing & Payment Processing platforms automate the creation, delivery, and collection of invoices — enabling Finance teams to bill customers, accept payments across methods (ACH, credit card, wire, check), track receivables, and reconcile payments against the GL. Core capabilities include invoice template creation, multi-channel delivery (email, portal, electronic), online payment acceptance, payment status tracking, automated reminders, cash application (matching payments to invoices), and integration with ERP and accounting systems. The category spans standalone invoicing tools (FreshBooks, Wave, Invoiced) and AR automation platforms (Billtrust, Versapay, YayPay) that add intelligent cash application and collections workflows.