On Wed, 23 Jan 2008 10:49:15 -0800 (PST), Dave
<dave_m_moore@post2me.freeserve.co.uk> wrote:

>I've looked at Paypal mechanisms but unless I am mistaken, it's
>difficult to integrate this in a way that looks like it's part of my
>website.

Paypal IPN is what you want I think.
Your site communicates with PayPal in real time and a script on your
server receives authentication (or not!) from PayPal.

Quite a learning curve.
or you can use one of these products to make your life easier:
http://www.withinweb.com/
(we use PHP-IPNMonitor successfully))
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