Down payment
A down payment was an initial payment made to secure an item.

As of 2370, according to Quark, Bajoran s had already made a down payment on blankets for orphans with the expected proceeds of a racquetball match between Julian Bashir and Miles O'Brien. This lie was an attempt to get them to go forward with the competition, which the Ferengi had rigged. ()

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Fees and payments