expiry/expiration/comming to an end	finishing or terminating a contract period
irrevocable	becomes due for repayment
shipping document	a document required to clear customs and take delivery of imported goods
maturity	the date on which a loan or bond will be paid
commercial invoice	a bill for goods from seller to a buyer
export licence	a government document authorizing the sale of spec goods in spec. quantities to a particular destin.
certificate of origin	a document stating where imported goods come from
weight certificate	issued by customs, certifies the gross weight of the exported goods
incoterms rules	international terms which define the responsibilities of buyers and sellers for the delivery of good
insurance certificate	describes the goods and contains details of how to claim if they are lost or damaged in transit