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1. Mail-order companies need to have an   process for invoicing and billing customers. When a customer places an  , a list of items must be   and an invoice generated. The invoice will list the items purchased, along with the cost of each item, and the quantity desired.   that will be incurred in shipping the items to the   are also added to the invoice. Sometimes shipping charges are simply   based on the weight or value of the items ordered.
The invoice also shows the   of payment. Payment is usually due within 30 days. Extra charges are often   on overdue accounts. Many companies also offer a small   if invoices are paid promptly.
Sometimes items get damaged or lost in transit, or customers discover that the wrong items have been shipped by  . They will usually call the company to have the problem  . Such complaints should be dealt with  . If an item is missing, a replacement will be sent, usually at no additional charge to the customer.