A value holding system includes a receiving unit that receives an instruction to add or remove a value relating to a payment, a judging unit that judges whether the instruction is identical to a previously received instruction, and a rejecting unit that rejects the instruction when the judging unit judges...http://www.google.fr/patents/US7051924?utm_source=gb-gplus-shareBrevet US7051924 - Value holding system, value holding method, value holding program, and transaction system
Value holding system, value holding method, value holding program, and ...
