const response = await fetch('https://api.emailit.com/v2/sending-domains', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer em_test_51RxCWJ...vS00p61e0qRE',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    name: 'mail.tuodominio.com',
    track_loads: false,
    track_clicks: false
  })
});

const result = await response.json();

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => 'https://api.emailit.com/v2/sending-domains',
  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' => 'mail.tuodominio.com',
    'track_loads' => false,
    'track_clicks' => false
  ]),
  CURLOPT_HTTPHEADER => [
    'Authorization: Bearer em_test_51RxCWJ...vS00p61e0qRE',
    'Content-Type: application/json'
  ],
]);

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

curl_close($curl);

if ($err) {
  echo "Errore cURL #:" . $err;
} else {
  $result = json_decode($response, true);
  print_r($result);
}

import requests

response = requests.post(
    'https://api.emailit.com/v2/sending-domains',
    headers={
        'Authorization': 'Bearer em_test_51RxCWJ...vS00p61e0qRE',
        'Content-Type': 'application/json'
    },
    json={
        'name': 'mail.tuodominio.com',
        'track_loads': False,
        'track_clicks': False
    }
)

result = response.json()
print(result)

require 'net/http'
require 'json'

uri = URI('https://api.emailit.com/v2/sending-domains')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

request = Net::HTTP::Post.new(uri)
request['Authorization'] = 'Bearer em_test_51RxCWJ...vS00p61e0qRE'
request['Content-Type'] = 'application/json'
request.body = {
  name: 'mail.tuodominio.com',
  track_loads: false,
  track_clicks: false
}.to_json

response = http.request(request)
result = JSON.parse(response.body)
puts result

package main

import (
    "bytes"
    "encoding/json"
    "fmt"
    "net/http"
)

func main() {
    url := "https://api.emailit.com/v2/sending-domains"
    
    data := map[string]interface{}{
        "name": "mail.tuodominio.com",
        "track_loads": false,
        "track_clicks": false,
    }
    
    jsonData, _ := json.Marshal(data)
    
    req, _ := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
    req.Header.Set("Authorization", "Bearer em_test_51RxCWJ...vS00p61e0qRE")
    req.Header.Set("Content-Type", "application/json")
    
    client := &http.Client{}
    resp, _ := client.Do(req)
    defer resp.Body.Close()
    
    var result map[string]interface{}
    json.NewDecoder(resp.Body).Decode(&result)
    fmt.Println(result)
}

use reqwest;
use serde_json::{json, Value};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = reqwest::Client::new();
    
    let response = client
        .post("https://api.emailit.com/v2/sending-domains")
        .header("Authorization", "Bearer em_test_51RxCWJ...vS00p61e0qRE")
        .header("Content-Type", "application/json")
        .json(&json!({
            "name": "mail.tuodominio.com",
            "track_loads": false,
            "track_clicks": false
        }))
        .send()
        .await?;
    
    let result: Value = response.json().await?;
    println!("{:?}", result);
    
    Ok(())
}

import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.net.URI;
import java.net.http.HttpRequest.BodyPublishers;

public class CreateSendingDomain {
    public static void main(String[] args) throws Exception {
        HttpClient client = HttpClient.newHttpClient();
        
        String jsonBody = "{\"name\":\"mail.tuodominio.com\",\"track_loads\":false,\"track_clicks\":false}";
        
        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create("https://api.emailit.com/v2/sending-domains"))
            .header("Authorization", "Bearer em_test_51RxCWJ...vS00p61e0qRE")
            .header("Content-Type", "application/json")
            .POST(BodyPublishers.ofString(jsonBody))
            .build();
        
        HttpResponse<String> response = client.send(request, 
            HttpResponse.BodyHandlers.ofString());
        
        System.out.println(response.body());
    }
}

using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;

public class CreateSendingDomain
{
    public static async Task Main()
    {
        using (var client = new HttpClient())
        {
            client.DefaultRequestHeaders.Add("Authorization", 
                "Bearer em_test_51RxCWJ...vS00p61e0qRE");
            
            var data = new { name = "mail.tuodominio.com", track_loads = false, track_clicks = false };
            var json = JsonConvert.SerializeObject(data);
            var content = new StringContent(json, Encoding.UTF8, "application/json");
            
            var response = await client.PostAsync(
                "https://api.emailit.com/v2/sending-domains", content);
            
            var result = await response.Content.ReadAsStringAsync();
            Console.WriteLine(result);
        }
    }
}

curl -X POST https://api.emailit.com/v2/sending-domains \
  -H "Authorization: Bearer em_test_51RxCWJ...vS00p61e0qRE" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "mail.tuodominio.com",
    "track_loads": false,
    "track_clicks": false
  }'

{
  "object": "sending_domain",
  "id": 1234567890,
  "uuid": "sd_1234567890",
  "name": "mail.tuodominio.com",
  "verification_token": "abc123def456",
  "verification_method": "dns",
  "verified_at": null,
  "dkim_identifier_string": "emailit._domainkey",
  "dns_checked_at": null,
  "spf_status": null,
  "spf_error": null,
  "dkim_status": null,
  "dkim_error": null,
  "mx_status": null,
  "mx_error": null,
  "return_path_status": null,
  "return_path_error": null,
  "dmarc_status": null,
  "dmarc_error": null,
  "track_loads": 0,
  "track_clicks": 0,
  "created_at": "2021-01-01T00:00:00Z",
  "updated_at": "2021-01-01T00:00:00Z"
}

{
  "error": {
    "code": 400,
    "message": "Richiesta non valida"
  }
}

{
  "error": {
    "code": 409,
    "message": "Il dominio esiste già"
  },
  "existing": {
    "object": "sending_domain",
    "id": 1234567890,
    "name": "mail.tuodominio.com"
  }
}