Records of individual receivable accounts are essential and may be maintained in various forms. Retainers included in accounts receivable.This AMBULANCE BILLING AND ACCOUNTS RECEIVABLE MANAGEMENT. Accounts Receivable Representative. If a business provides goods or services without requiring full payment up front, this unpaid balance is categorized as accounts receivable. Transactions may include accounts payable, accounts receivable, and other related fiscal service transactions. Need to Contact Customer Service? Click below to find a list of all our Ecolab and Nalco Water customer service phone numbers. Some payment service providers will wrap all of this up into one offering. Once returned with ranges, the accounts receivable is in charge of generating letters and having them mailed out.