I going to sell a group of art packs in the same style and I would like to set up a private forum for anyone who buys any of these packs.  I figured the best way to do this would be to set up a new project just for the private forum and then have the art packs give keys to this forum project as a reward.  Where it's breaking down is creating the reward.  Is there a way to set this up automatically, so that any person who buys the pack can get access without me doing anything or do I need to create a group of keys and input them as a reward individually?  One of the art packs I would like to do this with has sold thousands of copies, so the idea of doing this one by one is a little overwhelming!  Is this idea even possible?  I'm open to other ways of getting the same result.

Hey, sorry for not getting back sooner. We currently don't have a way to set up a global forum across many projects. We can however convert individual project pages to be available only to people who "own" that project (via download key or purchase). I'm wondering if there's a hybrid thing we could do where your forum lives on a project page and you had out access to that page when people buy things. 

Yeah, the hybrid thing sounds like what I was trying to pull off.  A private forum per project that can only be accessed by people who own it would kind of work, but I can't figure out how to do it without making the project private too.  I want people to be able to see and buy the project without restrictions, but not the forums unless they own it.