How and when can you cancel a buyer's bid as a seller 4 hours prior to listing closing?

A buyer has emailed me asking to cancel her bid as she no longer wants the product. Can I cancel her bid within 4 hours of listing closing?

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http://offer.ebay.com.au/ws/eBayISAPI.dll?CancelBidShow&ssPageName=STRK:MESRL:004

A seller can cancel a bid at any time.

Click on the link, you will need the ID of the buyer and the item number.