[pawan]

PaulSonny, since my customers will buy product directly from my website there will be no vBulletin involved in that.

So every customers will begin with "Registered User" usergroup. I want something which can make those users automatically upgrade their usergroup to "Customer Usergroup".

Here is what in my mind if its possible:

Step 1: My customer buys product from my website

Step 2: They goto the thank you page of the product and at the same page I give them "UNIQUE CODE" for accessing the private forum

Step 3: When they use the unique code they get automatically added to the customer only usergroup.

Is something like this possible or any hacks for doing that?