Coupons in Pro version

[wallaroo]

hi there

I've searched the site for more information on the coupon codes in the pro version.

Could I have some more info please.

here's what I'm trying to do:

My site BuddyPress (no multisite)
Is for strictly paid only members.
Members MUST have a code to join
Once a member has paid & joined I'd like them automatically logged in and returned to their profile page.

I have a plugin that will automatically log them in, cancels the email confirmation and sends them to their profile page.

I'm struggling to get this working with s2member.

If I upgrade to pro - at what stage of the signup is the code required?
What order will the signup process follow?

cheers