That link explains other security measures, but doesn't actually say that they need your bank/credit card login details though?!? (unless I missed it somewhere).

"Please note: Due to the rise of credit card fraud and for your security all credit card orders will be subject to detailed security checks requiring further documentation; that may include Driver Licence, CreditCard or bank statements. If your order does not meet our security check requirements, you will be contacted and further credit card security procedures will be implemented.

As part of our verification process we will utilise various procedures to ensure ultimate protection to the Credit Card holder. These processes may include but not limited to charging a small amount randomly under $2 requiring confirmation prior to approval; verbal verification via phone or a request for written Authorization, photo identification including valid Driver Licence, Utilities bill or the copy of the credit card or a request for your bank statement displaying the debit entry.

Mwave may also use a verification service powered by BankStatements.com.au, the Australian leader in automated bank statement data retrieval. Since 2013 BankStatements.com.au has provided secure, automated data retrieval services to over a quarter of a million Australians as part of their credit applications. "