On Wed, Apr 21, 2010 at 5:05 AM, Greg Ma <[email protected]> wrote:

> But when you pay you are charged only
> if the limit number of people has been reached.
> This means then save somehow your credit card number somewhere and
> charged you when the sell is done.
>
> My question is how, where do they do their paying thing?

I would imagine most if not all payment gateways (e.g. Authorize.net)
allow a "Authorization Only" submittal; the card is only actually charged
with a subsequent "Prior Authorization Capture" using a transaction id
or some other token, which means there's no need to retain the actual
card data on the site (a very good thing!).

HTH,
-- 
Hassan Schroeder ------------------------ [email protected]
twitter: @hassan

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