How can I set the refresh_token when working with the google api?

Question

I'm working off an example trying to learn how to use the google api to change events on a calendar. The server is the user which will update the calendar based off of information in a database. No user interaction is actually required. The problem is I am having issues getting/using refresh tokens. I click the "Connect Me" link that gets added to the page and it gives me an error: `Fatal error: Uncaught exception 'Google_Auth_Exception' with message 'Error refreshing the OAuth2 token, message: '{ "error" : "invalid_request", "error_description" : "Missing required parameter: refresh_token" }` I have tried setting the refresh token this way, along with similar methods, but none of them seem to work which makes me think I am implementing them incorrectly. When I print out the `$_SESSION['access_token']` variable, it shows no `refresh_token`: `{"access_token":"token","token_type":"Bearer","expires_in":3599,"created":1417534503}` Here is the function I am using to authorize the 'user' wi…

Accepted Answer

Check if the token has a refresh-token (if you request offline access, the refresh-token will be sent with the access token the first time).

Something like this

```
 $token = $client->getAccessToken();
 $authObj = json_decode($token);
 if(isset($authObj->refresh_token)) {
     save_refresh_token($authObj->refresh_token);
 }
```

Where save_refresh_token saves your refresh-token somewhere (db).

Then you can check if token as expired by:

```
 $client->isAccessTokenExpired()
```

If it is, you can update it with:

```
$client->refreshToken($your_saved_refresh_token);
```

And then set your new access token to the session:

```
 $_SESSION['access_token'] = $client->getAccessToken();
```

How can I set the refresh_token when working with the google api?

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