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When you're amazon, you can negotiate anything. They're probably the single biggest online credit card merchant.

AFAIK the CVV is not required to perform a transaction. It's just that you take the hit in case a fraud occurs when you don't check the CVV.

Depends on your merchant account I believe. We tokenize them somehow, and can do further transactions by referencing the first transaction.

You don't need to make the user enter the CVV for any transaction, it just helps with a lower fee and to shift the chargeback liability.