public function merge(DownstreamResponse $response)
    {
        $this->numberTokensSuccess += $response->numberSuccess();
        $this->numberTokensFailure += $response->numberFailure();
        $this->numberTokenModify += $response->numberModification();

        $this->tokensToDelete = array_merge($this->tokensToDelete, $response->tokensToDelete());
        $this->tokensToModify = array_merge($this->tokensToModify, $response->tokensToModify());
        $this->tokensToRetry = array_merge($this->tokensToRetry, $response->tokensToRetry());
        $this->tokensWithError = array_merge($this->tokensWithError, $response->tokensWithError());
    }