PHP SDK: How do I capture the access token after user auths app?

Question

This is for a canvas app on the Facebook Platform using the new(est) Facebook PHP SDK.

We are using the PHP example from the Facebook tutorial (https://developers.fa

Answer 1

If you want to do this with PHP, you can get the user's access token with a separate call to the Graph API at your redirect_uri. For this you need to change the response_type of your $auth_url in your index page to "code" or "code token".

Then, at your redirect page, Facebook will add a "code" parameter in the querystring. This API call will return you the full access_token and expiration time:

https://graph.facebook.com/oauth/access_token?
    client_id=YOUR_APP_ID&
    redirect_uri=YOUR_URL&
    client_secret=YOUR_APP_SECRET&
    code=$_REQUEST['code']

For more information you can refer to the docs on authentication.