This Abstract Business Invoice is used in any location where services or products are provided, and it usually includes a list of charges for the services or products provided. In some situations, such as a supermarket, invoices are delivered immediately, or they can be delivered via email or postal mail. After receiving the invoice, it must be paid, which involves various methods from which to choose. This pattern comprises two simpler patterns that describe the invoice's creation and payment, respectively. The composite design represents the simplest application and can be combined with other related patterns to express more complex applications.
