AdWords API Re: Enabling content match via API

The Website object you see in the API relates only to website targetted
campaigns, which do not have keywords.

The content bids for keyword targetted campaigns is a new feature that
is not yet supported by the API. This should become available in
January:
http://adwordsapi.blogspot.com/2005/11/exposing-content-bidding-via-api-in.html