invoice
commercial document issued by a seller to a buyer, relating to a sale transaction and indicating the products, quantities, and agreed prices for products or services the seller has provided the buyer
pro forma invoice
"confirmed purchase order" where buyer and supplier agree on detail and cost of the product to be shipped; raised when the seller is ready for dispatching the material but they want to ensure that the payment is being sent before dispatch
commercial invoice
document used in foreign trade
energy bill
basis for billing energy flows of delivered energy in monetary value on the one hand