public function revokeAccessToken()
    {
        //Access Token
        $accessToken = $this->getApp()->getAccessToken();

        //Request
        $request = new DropboxRequest("POST", "/auth/token/revoke", $accessToken);
        // Do not validate the response
        // since the /token/revoke endpoint
        // doesn't return anything in the response.
        // See: https://www.dropbox.com/developers/documentation/http/documentation#auth-token-revoke
        $request->setParams(['validateResponse' => false]);

        //Revoke Access Token
        $this->getClient()->sendRequest($request);
    }