Finance:Collateral Billing number
From HandWiki
A Collateral Billing number (CBN) is a number that sometimes can be given in place of a purchase order or a credit card number to ensure a products return. For example, you receive a defective product and call the manufacturer, they in turn send you a replacement unit after collecting a purchase order, credit card or collateral billing number from you to charge the cost of the unit to in the event that you do not return the original unit.
Original source: https://en.wikipedia.org/wiki/Collateral Billing number.
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