curl --request POST \
  --url https://panel.sendcloud.sc/api/v3/dsf/carrier-support-contacts \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "carrier_code": "postnl",
  "email": "carrier@email.com",
  "language": "en-us"
}
'

import requests

url = "https://panel.sendcloud.sc/api/v3/dsf/carrier-support-contacts"

payload = {
    "carrier_code": "postnl",
    "email": "carrier@email.com",
    "language": "en-us"
}
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({carrier_code: 'postnl', email: 'carrier@email.com', language: 'en-us'})
};

fetch('https://panel.sendcloud.sc/api/v3/dsf/carrier-support-contacts', 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://panel.sendcloud.sc/api/v3/dsf/carrier-support-contacts",
  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([
    'carrier_code' => 'postnl',
    'email' => 'carrier@email.com',
    'language' => 'en-us'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Basic <encoded-value>",
    "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://panel.sendcloud.sc/api/v3/dsf/carrier-support-contacts"

	payload := strings.NewReader("{\n  \"carrier_code\": \"postnl\",\n  \"email\": \"carrier@email.com\",\n  \"language\": \"en-us\"\n}")

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

	req.Header.Add("Authorization", "Basic <encoded-value>")
	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://panel.sendcloud.sc/api/v3/dsf/carrier-support-contacts")
  .header("Authorization", "Basic <encoded-value>")
  .header("Content-Type", "application/json")
  .body("{\n  \"carrier_code\": \"postnl\",\n  \"email\": \"carrier@email.com\",\n  \"language\": \"en-us\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://panel.sendcloud.sc/api/v3/dsf/carrier-support-contacts")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Basic <encoded-value>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"carrier_code\": \"postnl\",\n  \"email\": \"carrier@email.com\",\n  \"language\": \"en-us\"\n}"

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

{
  "id": 1,
  "carrier_code": "dpd",
  "email": "dpd@email.com",
  "language": "nl-nl"
}

{
  "errors": [
    {
      "code": "bad_request",
      "detail": "Validation Error. Errors: [{'type': 'missing', 'loc': ('email',), 'msg': 'Field required'}]",
      "title": "Bad Request",
      "status": 400
    }
  ]
}

{
  "errors": [
    {
      "code": "conflict",
      "detail": "Already exists",
      "title": "Conflict",
      "status": 409
    }
  ]
}