Why do I have a transaction in pending as well as a completed transaction on my account from the same merchant?
Some online merchants will verify your card details by processing a separate pre-authorisation amount (the dollar values can vary), prior to processing the purchase transaction. Usually after the transaction is complete the separate pending transaction and funds will be released within five business days.
If the merchant has processed a separate pre-authorisation amount and you would like the funds to be released before the five business days, particularly if the pending amount is of higher value, the merchant can provide us with a pre-authorisation release confirming they have no intention to debit the restricted funds.
https://www.beyondbank.com.au/need-help/completed-and-pending-transactions-from-same-merchant