5/the principles of Pos machine offline, but links with the Bank's investigation system, the nature of the Pos machine is paying the costs, cash according to cardholder's limit (this issue e see the cardholder have limits?) for Bank of Vietnam, the Bank's limit is run by inter-bank system , so can't say limit of Vietnamese banks are, moreover also be guaranteed payment, control by the Central Bank system webpages, so few B also not formidable problems.
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