I need information about my recent purchase

Wouldn't it be more logical to research this before you buy the product? I believe CoH is a Steamworks title however which should mean that unless you bought a boxed retail copy it should work on Steam.

http://support.steampowered.com/kb_article.php?ref=7480-WUSF-3601

Why not try and enter it in and see if it activates?

If you wanted it for Steam you should have just bought it from Steam. Also, did you really need to make a thread about this? Is it that hard to get the key and try to activate it in Steam to find out?

Try it? If you need to activate it on the GameStop Client, you can see the real Key in the Client.