A Work Order Invoice is a document that is used by businesses to invoice their customers for services rendered. It typically includes the customer's contact information, a description of the services rendered, the total cost, and payment terms. It is also used to track and document the work performed. There are two main types of Work Order Invoices: service invoices and material invoices. Service invoices are used to invoice for services such as labor, repairs, and maintenance. Material invoices are used to invoice for materials such as parts, supplies, and tools.