Not receiving Google OAuth refresh token

Question

I want to get the access token from Google. The Google API says that to get the access token, send the code and other parameters to token generating page, and the response

Answer 1

Setting this will cause the refresh token to be sent every time:

$client->setApprovalPrompt('force');

an example is given below (php):

$client = new Google_Client();
$client->setClientId($client_id);
$client->setClientSecret($client_secret);
$client->setRedirectUri($redirect_uri);
$client->addScope("email");
$client->addScope("profile"); 
$client->setAccessType('offline');
$client->setApprovalPrompt('force');