Gets information about a user access token issued by an app. See
        <https://developers.facebook.com/docs/facebook-login/
        access-tokens/debugging-and-error-handling>

        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):
        """
        Gets information about a user access token issued by an app. See
        <https://developers.facebook.com/docs/facebook-login/
        access-tokens/debugging-and-error-handling>

        We can generate the app access token by concatenating the app
        id and secret: <https://developers.facebook.com/docs/
        facebook-login/access-tokens#apptokens>

        """
        args = {
            "input_token": token,
            "access_token": "{0}|{1}".format(app_id, app_secret),
        }
        return self.request(self.version + "/" + "debug_token", args=args)