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This isn't entirely true. You can auth $1 and then never capture it, which will result in no money being charged.

I thought that's what I said, and also what the parent said. I was refuting that the reason sites authorize $1 instead of $0 to validate a card was to stop spam/scammers -- that's a valid reason, but the root reason it was always $1 was because $0 authorizations weren't possible.

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