Paid Subscription - New Members

[wilhud]

I have setup our vBulletin so that only paid members can access the majority of the content. In the past we have manually entered paid subscription data since orders were placed on our webstore outside of vbulletin. However, we are no longer selling the memberships on our webstore and now need to add the ability to purchase memberships inside the vbulletin software. I have found where existing members can go to extend there memberships, inside of the user settings pane under My Account > Paid Subscriptions. That works fine with both of our payment methods. However, I'm not sure how new members would sign up, since they cannot access that section prior to being registered. Is there a page where new members can signup or does that need to be custom built? If it is something that requires customization, does anyone know of a good existing plugin that handles paid registration cleanly?

Thanks,
Wil