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In what backward place does this happen? It shows up the second I pay here (Australia)

it's common, they reserve an amount, and then update towards the final payment. These are not payments as such, and almost always take 48 hours to clear. Same at hotel rooms usually etc..

Many banks only show payments (so only after cleared) and not reserved funds. They will just show that you don't have the full credit available

The update with the final amount happens within minutes after you’re done pumping, not only at batch clearing time.

This was introduced to not unnecessarily block debit card funds for days but it works like that for credit cards as well now.

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