The duties and responsibilities of a Billing Specialist include sending invoices and account updates to clients, receiving, sorting, and tracking incoming payments, addressing and resolving client questions and issues relating to invoices, and providing regular, accurate reports of billing data. On the customer end, card transactions appear as line items on credit and debit card statements. These line items can include billing descriptors. Billing descriptors can prevent chargebacks by helping customers recognize line items on their statements.