They are still going to get sent to paypal to obtain payment information, the thing is that they shouldn't actually get charged until you have authorized the payment. (That's my understanding of how it works.) There is information on the paypal site about how that feature works, and I haven't read it for a long while.
The idea is that paypal collects the payment information (not you at your site) and "holds" on to the transaction until you have said "go". This maintains the privacy of the customer's payment info and allows you to eventually get paid.
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