'Gets information about a user access token issued by an app. See
<https://developers.facebook.com/docs/facebook-login/access-tokens
#debug>
We can generate the app access token by concatenating the app
id and secret: <https://developers.facebook.com/docs/
facebook-login/access-tokens#apptokens>'

def debug_access_token(self, token, app_id, app_secret):

    args = {'input_token': token, 'access_token': ('%s|%s' % (app_id, app_secret))}
    return self.request('/debug_token', args=args)
