GnuCash has an integrated accounts receivable system. The transactions generated by the A/R system are recorded within the Accounts Receivable account. You generally do not work directly with this account. You generally work with the four integrated GnuCash A/R application components available through the Business -> Customer sub-menu. These four components are:
Customers are people or companies to whom you sell products or services on credit.
Invoices represent the physical invoice you send to a customer to request payment. This invoice contains an itemized list of things you sold.
Jobs (optional) is where you register Customer Jobs. Jobs are a mechanism by which you can group multiple invoices to a particular customer.
Process Payments is used to register payments you received from a customer.
The following sections introduce the individual components in more detail.