Any forum module?

Has anyone developed a forum module yet? I believe lots of people need this module. Ok, using a phpbb3 or other forum is just fine... but you do not want your visitor to log in twice and this is really kinda silly...

The big problem is that for any solution to work when tied with an e-commerce store, the user registration and authentication must be managed by the store software and not by the forum software. This is because the store requires detailed personal information that a forum does not, and it would be much, much more difficult to write code that makes sure this personal information is present prior to permitting the first actual sale, than to modify the forum software to check user names and passwords from the store's database and to redirect the forum's "Register" intercepts to the store's new customer routine.

Unfortunately, nobody has yet come up with a smooth solution to having the forum cede its user management and authentication functions to a store.

If you're willing to pay, I'll happily do this for you.

Integrating opencart with phpbb or vbulletin needs to be attempted.