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