Make sure to url encode the redirect_uri. http://mydomain.com/vsfederation_site/index.php?page=account&action=twitch_connect becomes http%3A%2F%2Fmydomain.com%2Fvsfederation_site%2Findex.php%3Fpage%3Daccount%26action%3Dtwitch_connect, so the final url will be https://api.twitch.tv/kraken/oauth2/authorize?response_type=token&client_id=[mycode]&redirect_uri=http%3A%2F%2Fmydomain.com%2Fvsfederation_site%2Findex.php%3Fpage%3Daccount%26action%3Dtwitch_connect&scope=user_read.
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