curl --request POST \
  --url https://service.incaseof.law/openapi/customers \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "Firma ABC GmbH",
  "email": "[email protected]",
  "phone": "+43 1 234 5678",
  "partner_id": "a1b2c3d4-0000-0000-0000-000000000000",
  "address": {
    "street": "Hauptstraße 1",
    "city": "Wien",
    "zip": "1010",
    "country": "AT"
  }
}
'

import requests

url = "https://service.incaseof.law/openapi/customers"

payload = {
    "name": "Firma ABC GmbH",
    "email": "[email protected]",
    "phone": "+43 1 234 5678",
    "partner_id": "a1b2c3d4-0000-0000-0000-000000000000",
    "address": {
        "street": "Hauptstraße 1",
        "city": "Wien",
        "zip": "1010",
        "country": "AT"
    }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    name: 'Firma ABC GmbH',
    email: '[email protected]',
    phone: '+43 1 234 5678',
    partner_id: 'a1b2c3d4-0000-0000-0000-000000000000',
    address: {street: 'Hauptstraße 1', city: 'Wien', zip: '1010', country: 'AT'}
  })
};

fetch('https://service.incaseof.law/openapi/customers', 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://service.incaseof.law/openapi/customers",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'name' => 'Firma ABC GmbH',
    'email' => '[email protected]',
    'phone' => '+43 1 234 5678',
    'partner_id' => 'a1b2c3d4-0000-0000-0000-000000000000',
    'address' => [
        'street' => 'Hauptstraße 1',
        'city' => 'Wien',
        'zip' => '1010',
        'country' => 'AT'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

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

curl_close($curl);

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

package main

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

func main() {

	url := "https://service.incaseof.law/openapi/customers"

	payload := strings.NewReader("{\n  \"name\": \"Firma ABC GmbH\",\n  \"email\": \"[email protected]\",\n  \"phone\": \"+43 1 234 5678\",\n  \"partner_id\": \"a1b2c3d4-0000-0000-0000-000000000000\",\n  \"address\": {\n    \"street\": \"Hauptstraße 1\",\n    \"city\": \"Wien\",\n    \"zip\": \"1010\",\n    \"country\": \"AT\"\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://service.incaseof.law/openapi/customers")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"Firma ABC GmbH\",\n  \"email\": \"[email protected]\",\n  \"phone\": \"+43 1 234 5678\",\n  \"partner_id\": \"a1b2c3d4-0000-0000-0000-000000000000\",\n  \"address\": {\n    \"street\": \"Hauptstraße 1\",\n    \"city\": \"Wien\",\n    \"zip\": \"1010\",\n    \"country\": \"AT\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://service.incaseof.law/openapi/customers")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"name\": \"Firma ABC GmbH\",\n  \"email\": \"[email protected]\",\n  \"phone\": \"+43 1 234 5678\",\n  \"partner_id\": \"a1b2c3d4-0000-0000-0000-000000000000\",\n  \"address\": {\n    \"street\": \"Hauptstraße 1\",\n    \"city\": \"Wien\",\n    \"zip\": \"1010\",\n    \"country\": \"AT\"\n  }\n}"

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