Banks update customer accounts in one of two ways: online, real time updating posts transactions to customer accounts as they occur or as they are received; batch processing collects transactions during the business day, and posts them all in a batch at the end of the day.
With real-time processing, customer balances are actually updated with each transaction as it occurs. With batch processing, memo items may update the balance unofficially, but the actual balance change is not completed until the end of the business day.
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