curl --request POST \
  --url https://api.altera.co/company/contractors \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "contractorId": 4527,
  "contractorRegion": "POLAND",
  "country": "PL",
  "contractorType": "COMPANY",
  "contractorName": "Apple Computer, Inc.",
  "street": "Rejsi Manor",
  "houseNumber": "465",
  "flatNumber": "42",
  "city": "Menahga",
  "postCode": "58-261",
  "taxIdentificationNumber": "8958666780",
  "email": "spend@different.com",
  "areaNumber": "",
  "phoneNumber": "337507196"
}
'

import requests

url = "https://api.altera.co/company/contractors"

payload = {
    "contractorId": 4527,
    "contractorRegion": "POLAND",
    "country": "PL",
    "contractorType": "COMPANY",
    "contractorName": "Apple Computer, Inc.",
    "street": "Rejsi Manor",
    "houseNumber": "465",
    "flatNumber": "42",
    "city": "Menahga",
    "postCode": "58-261",
    "taxIdentificationNumber": "8958666780",
    "email": "spend@different.com",
    "areaNumber": "",
    "phoneNumber": "337507196"
}
headers = {
    "Authorization": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    contractorId: 4527,
    contractorRegion: 'POLAND',
    country: 'PL',
    contractorType: 'COMPANY',
    contractorName: 'Apple Computer, Inc.',
    street: 'Rejsi Manor',
    houseNumber: '465',
    flatNumber: '42',
    city: 'Menahga',
    postCode: '58-261',
    taxIdentificationNumber: '8958666780',
    email: 'spend@different.com',
    areaNumber: '',
    phoneNumber: '337507196'
  })
};

fetch('https://api.altera.co/company/contractors', 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://api.altera.co/company/contractors",
  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([
    'contractorId' => 4527,
    'contractorRegion' => 'POLAND',
    'country' => 'PL',
    'contractorType' => 'COMPANY',
    'contractorName' => 'Apple Computer, Inc.',
    'street' => 'Rejsi Manor',
    'houseNumber' => '465',
    'flatNumber' => '42',
    'city' => 'Menahga',
    'postCode' => '58-261',
    'taxIdentificationNumber' => '8958666780',
    'email' => 'spend@different.com',
    'areaNumber' => '',
    'phoneNumber' => '337507196'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: <api-key>",
    "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://api.altera.co/company/contractors"

	payload := strings.NewReader("{\n  \"contractorId\": 4527,\n  \"contractorRegion\": \"POLAND\",\n  \"country\": \"PL\",\n  \"contractorType\": \"COMPANY\",\n  \"contractorName\": \"Apple Computer, Inc.\",\n  \"street\": \"Rejsi Manor\",\n  \"houseNumber\": \"465\",\n  \"flatNumber\": \"42\",\n  \"city\": \"Menahga\",\n  \"postCode\": \"58-261\",\n  \"taxIdentificationNumber\": \"8958666780\",\n  \"email\": \"spend@different.com\",\n  \"areaNumber\": \"\",\n  \"phoneNumber\": \"337507196\"\n}")

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

	req.Header.Add("Authorization", "<api-key>")
	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://api.altera.co/company/contractors")
  .header("Authorization", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"contractorId\": 4527,\n  \"contractorRegion\": \"POLAND\",\n  \"country\": \"PL\",\n  \"contractorType\": \"COMPANY\",\n  \"contractorName\": \"Apple Computer, Inc.\",\n  \"street\": \"Rejsi Manor\",\n  \"houseNumber\": \"465\",\n  \"flatNumber\": \"42\",\n  \"city\": \"Menahga\",\n  \"postCode\": \"58-261\",\n  \"taxIdentificationNumber\": \"8958666780\",\n  \"email\": \"spend@different.com\",\n  \"areaNumber\": \"\",\n  \"phoneNumber\": \"337507196\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.altera.co/company/contractors")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"contractorId\": 4527,\n  \"contractorRegion\": \"POLAND\",\n  \"country\": \"PL\",\n  \"contractorType\": \"COMPANY\",\n  \"contractorName\": \"Apple Computer, Inc.\",\n  \"street\": \"Rejsi Manor\",\n  \"houseNumber\": \"465\",\n  \"flatNumber\": \"42\",\n  \"city\": \"Menahga\",\n  \"postCode\": \"58-261\",\n  \"taxIdentificationNumber\": \"8958666780\",\n  \"email\": \"spend@different.com\",\n  \"areaNumber\": \"\",\n  \"phoneNumber\": \"337507196\"\n}"

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

{
  "result": "OK",
  "data": {
    "contractorId": 4527
  }
}