They don't actually take the money. Lets get that clear.
It's merely a check to make sure the card is active. It also checks (within the quite small constraints of the AVS system) that the address given to Amazon matches the details on the card.
There are many reports on the forum, that coming upto disbursement time, and when in review, people have had upto 10$ put on authorisation.
If Amazon's test authorisation fails, they will know why from the declined code they get. Whether it's no funds, AVS not matching up, they'll know.
I'd recommend always having at least £10 on the card used for registration. You never know what may happen.
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