Invoice

Source: Encyclopedia of Banking & Finance (9h Edition) by Charles J Woelfel
(We recommend this as work of authority and you can order it here)

A sales slip; an itemized bill given by a seller to a purchaser of goods showing all the particulars of the sale, e.g., date, name of buyer and seller, salesperson's number, quantity and description of articles, unit prices, extensions, discounts (if any), total footing, etc.  The invoice is in reality an original entry record, and since the billing system has come into general use, a duplicate of each invoice frequently is retained by the seller from which the monthly statement is prepared.

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