No, I don't have any experience using steam API. But I have a lot of experience using APIs. They do have deficient documentation for results though, so I need you to gather information and email it to me. I've sent you an email address to send to me at.
I need you to go to these pages, and save the XML and send it to me:
The string of X's replace with your API key, and the string of Y's replace with your steam userid.
GetUserStatsForGame I'm most interesting in since the API documentation lists nothing for return. I don't care about any of the data within it so you can remove it if you want (your webapi key does have protocols around its usage, you'll want to make sure you read the TOS to make sure you won't violate them), I just want the structural elements and any relations (so I have to know if id matches in two sets, which they should).