Get refresh token google api

Question

I can't get my refresh token with my code. I can only get my access token, token type etc., I have followed some tutorials like putting access_type=offline on my login URL:

echo "<a href='https://accounts.google.com/o/oauth2/auth?" 
    . "access_type=offline&client_id=123345555.apps.googleusercontent.com& "
    . "scope=https://www.googleapis.com/auth/calendar+https://www.googleapis.com/auth/plus.me&response_type=code& "
    . "redirect_uri=http://www.sample.com/sample.php&state=/profile'>Google</a>";

and my fields in getting the access token:

$fields=array(
    'code'=>  urlencode($authcode),
    'client_id'=> urlencode($clientid),
    'client_secret'=> urlencode($clientsecret),
    'redirect_uri'=> urlencode($redirecturi),
    'grant_type'=> 'authorization_code',
);

but I can't get refresh_token, just the access_token, token_type, id_token and expires_in.

Answer 1

Found out by adding this to your url parameters

approval_prompt=force

Update:

Use access_type=offline&prompt=consent instead.

approval_prompt=force no longer works https://github.com/googleapis/oauth2client/issues/453