1. A system for crediting a rebate to a designated account of a user of the system, comprising: a rebate certificate, said certificate having at least one predetermined unique code thereon; input means for receiving from the user the predetermined unique code taken from the rebate certificate, said input means being capable of generating a signal comprising data corresponding to said predetermined code; a processor linkable to said input means for receiving said signal, said processor being capable of reading said signal, said processor including means for identifying redeemable rebate certificates, and determining whether the rebate certificate having said predetermined unique code is redeemable; means for linking the input device and the processor so that said signal may be transmitted therebetween; and means operatively associated with said processor for crediting the rebate to the designated account.