curl --request GET \
  --url https://www.firmium.de/api/v1/companies/{uuid}/ \
  --cookie sessionid=

import requests

url = "https://www.firmium.de/api/v1/companies/{uuid}/"

headers = {"cookie": "sessionid="}

response = requests.get(url, headers=headers)

print(response.text)

const options = {method: 'GET', headers: {cookie: 'sessionid='}};

fetch('https://www.firmium.de/api/v1/companies/{uuid}/', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://www.firmium.de/api/v1/companies/{uuid}/",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_COOKIE => "sessionid=",
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://www.firmium.de/api/v1/companies/{uuid}/"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("cookie", "sessionid=")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://www.firmium.de/api/v1/companies/{uuid}/")
  .header("cookie", "sessionid=")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://www.firmium.de/api/v1/companies/{uuid}/")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["cookie"] = 'sessionid='

response = http.request(request)
puts response.read_body

{
  "uuid": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "name": "<string>",
  "registration_number": "<string>",
  "addresses": [
    {
      "street": "<string>",
      "house_number": "<string>",
      "city": "<string>",
      "postal_code": "<string>",
      "country": "<string>",
      "country_code": "<string>",
      "is_primary": true,
      "latitude": "<string>",
      "longitude": "<string>"
    }
  ],
  "industry_codes": [
    {
      "code": "<string>",
      "description": "<string>",
      "scheme": "<string>",
      "version": "<string>",
      "is_primary": true
    }
  ],
  "legal_form": "<string>",
  "vat_number": "<string>"
}

"<unknown>"