private function setRequestOptions()
    {
        $authBearer = 'Bearer '. $this->secretKey;

        $this->client = new Client(
            [
                'base_uri' => $this->baseUrl,
                'headers' => [
                    'Authorization' => $authBearer,
                    'Content-Type'  => 'application/json',
                    'Accept'        => 'application/json'
                ]
            ]
        );
    }