Hi Guys,
Thanks for your helpful response as always, Mike.
Yes, what you would do is add some custom code in a very specific place of your payment processing script. (ie. Your thank you page) If your cart doesn't let you run PHP in your thank-you page you would have to modify the script near the part that outputs the thank-you page.
A simple "signup to list" as described in
this post would do it, combined with the Additional Operations feature on the List Settings page set to remove users from the pre-sales list.
If you let us know which shopping cart you are using (providing it's free) I might be able to assist further with where exactly in the files the code should go.
Some existing processing scripts feature ListMail plugins, such as
aMember and
aShop help you do this more easily.
Regards