How to provide Youtube authentication token in PHP cURL
Look to this guide:
https://developers.google.com/youtube/2.0/developers_guide_protocol#OAuth2_Calling_a_Google_API
You need to add a header containing: Authorization: Bearer ACCESS_TOKEN
$headers = array('Authorization: Bearer ' . $access_token);curl_setopt($ch_subs, CURLOPT_HTTPHEADER, $headers);You can also pass the token as part of the Get request:
curl_setopt($ch_subs, CURLOPT_URL, 'https://gdata.youtube.com/feeds/api/users/default/subscriptions?v=2&access_token=' . $access_token);