The Commonwealth Bank of Australia (CBA) has issued a statement on Thursday, apologising for the "intermittent issues" its systems experienced on Wednesday.
The apology followed reports that customers of the bank were left without access to their credit card and loan information on the online banking platform.
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"We're sorry that some customers experienced intermittent issues with our systems yesterday," the bank said.
"Our teams have worked around the clock to fix the problem and NetBank, CommBank app, and CommBiz services are restored."
CBA said credit card payments and transfers have been processed, and that customers will start to see the transactions reflected in their accounts.
"We fully understand this has caused inconvenience and that some customers may have incurred late fees. We will assess any fees charged during an outage on a case-by-case basis and determine how to help customers who have been disadvantaged.
"We sincerely apologise for the inconvenience and would like to thank customers for their patience."