pagado por adelantado
adj.
prepaid
pagado por adelantado
(adj.) = prepaid [pre-paid]
Ex: Libraries may use this service through the medium of a prepaid voucher which covers the cost of handling and despatch of the document to be borrowed.
pagar por adelantado
(v.) = pay + up-front
Ex: Why would tradesmen do work for him without being paid up-front, if he is not a man of his word?.