Integration with OSCommerce user base and session

[m0sh3]

Hi, I'm looking into integrating vBulletin into existing site and authentication environment that uses modified OSCommerce package. After some browsing in vBulletin code i found that i'll have to:

1. modify "session.php" to retrieve user info thru user mapping from OSCommerce accounts;

2. create records in `user` table - either:
a. during creation of user in OSCommerce, or
b. upon first time access to "session.php" when user doesn't exist in `vb3.user`

3. anything else?..

Alternatively, is there an easy and established way to use existing database and session user info?

Thank you for any input