How Do I Do This? (Payments)

[محروم.كوم]

Hi,

I have a private forum in my forum.And I have a sales page.

The 'BUY NOW' button on the sales page is linked to the PayPal transaction.

Most of the people who see the sales page are not members of my open forum.

So how do i do this:
After payment the buyer gets registered on my forum and goes to the usergroup of Paid members.

PayPal has a 'success' page which the buyer is shown after successful payment. So maybe I can link that somewhere.

Thank you __DEFINE_LIKE_SHARE__