Many of a company's customers regularly pay less than is charged on their bills, or fail to pay their bills at all. Along with normal dunning letters, the company uses a manual, not IT-based…

Many of a company's customers regularly pay less than is charged on their bills, or fail to pay their bills at all. Along with normal dunning letters, the company uses a manual, not IT-based process, to track and resolve these cases. Which application would you recommend to improve the processing of accounts receivable and to reduce outstanding invoices?