As far as I know, they don't do it.
If a company would like to check how much you have on the card, they have to issue a temporary block on funds (same way it works in hotels).
Now if you use for example Revolut, you can see if this block happens.
@Yashas01 We would love to talk with you about partnering up. We have the unique soft, that can acommodate your needs in terms of high quality and vast amounts of data. PM me to discuss.
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