I did not specify a redirect status code (the 3xx series) in the php script of link.php, I only use

header("Location: http://www.example.com");

Do you think that this might have caused Google to get confused? This is not a permanent redirect it is only a redirect to an affiliate URL, which may change from time to time. This page redirects to different URL's depending on the parameters passed with the URL, so which status code do you suggest is the safest to use, 302? I know Search Engines, especially Google, do not always like redirects, so I want to get this right.