private function setHttpResponse($relativeUrl, $method, $body = [])
    {
        if (is_null($method)) {
            throw new IsNullException("Empty method not allowed");
        }

        $this->response = $this->client->{strtolower($method)}(
            $this->baseUrl . $relativeUrl,
            ['json' => $body] // ✅ 
        );

        return $this;
    }