ADD-INS is: a. something designed or intended for use in conjunction with another, e.g. accessories to a primary product in a purchase order; or, b. an accessory software program that extends the capabilities of an existing application.
BILLS PAYABLE, in merchant accounts, are all bills which have been accepted, and promissory notes which have been made, are called "bills payable," and are entered in a ledger account under that name, and recorded in a book bearing the same title.
A&M is Additions and Maintenance.
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