[YouTube-API] refresh_token: Invalid_grant

Hi,

I am trying to get a token with the refresh_token.

I read the documentation but it doesn't work !

Here is what i do:

$data = array(
'client_id' =>
'XXXXXXXXXXXXXXXXXXX.apps.googleusercontent.com',
'client_secret' => 'XXXXXXXXXXXXXXXXXXX',
'refresh_token' => 'XXXXXXXXXXXXXXXXXXX',
'grant_type' => 'refresh_token'
);

$ch = curl_init("https://accounts.google.com/o/oauth2/token");
curl_setopt($ch,CURLOPT_POST,true);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch,CURLOPT_POSTFIELDS,$data);
$resp = curl_exec($ch);

print_r(json_decode($resp));

RESULT:
[error] => invalid_grant

I had the same problem with the precedent step (to get the refresh
token) and i solved it by add "approval_prompt=force" in the loginURL,
but i don't find any solution to refresh the token with Oauth2.

Thanks for help !

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