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when you shopping, push the "credit" button from an eftpos machine, a transaction authorisation request will be sent to bank host, then the host will hold/reserve the amount, this is displayed by current balance and available balance, current balance remains unchanged, but available balance will be deducted by the amount.
several days later, a transaction advice will reach bank host from VISA/MASTERCARD/ETC, it will map the previous authorisation, and debit your current balance, resulting two balance display the same amount. |
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