{
    "sender": "iP1",
    "recipients":[
        "456189040623",
        "175368927054",
        "392094880589",
        "568798567631"
    ],
    "body": "A very nice message",
}

{
    "sender": "iP1",
    "recipients":{
        "456189040623": {
            "sign": "sent by Bob"
        },
        "175368927054": {},
        "392094880589": {},
        "568798567631": {},
        "default":{
            "sign": " sent by iP.1"
        }
    },
    "body": "A very nice message{sign}",
    "type": "sms",
    "datacoding": "gsm",
    "priority": 1,
    "deliveryWindows": [
        {
            "opens": "ISO-8601 string",
            "closes": "ISO-8601 string"
        },
        {
            "opens": "ISO-8601 string",
            "closes": "ISO-8601 string"
        }
    ],
    "deliveryReportUrl": "https://api.example.com/sms/deliveryreport",
    "reference": "A client reference",
    "tags": ["marketing", "ux", "design"]
}

using (var client = new HttpClient())
{
    client.BaseAddress = new Uri("https://api.ip1sms.com/v2/");
    client.DefaultRequestHeaders.Accept.Clear();
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", "API Key");

    var sms = new OutgoingSMS()
    {
        Sender = "iP1",
        Recipients = new List<string>() { "46712345678" },
        Body = "Test message rest v2",
        Type = "sms",
        Datacoding = "gsm",
        Priority = 1,
        Reference = "Test",
        Tags = new List<string>() { "Test SMS" }
    };

    HttpResponseMessage response = await client.PostAsJsonAsync("batches", sms);

    if (response.IsSuccessStatusCode)
    {
        Console.WriteLine("Sent");
    }
    else
    {
        Console.WriteLine("Failed, " + response.StatusCode + ": " + await response.Content.ReadAsStringAsync());
    }
}
    
public class OutgoingSMS
{
    public string Sender { get; set; }
    public List<string> Recipients { get; set; }
    public string Body { get; set; }
    public string Type { get; set; }
    public string Datacoding { get; set; }
    public int Priority { get; set; }
    public string Reference { get; set; }
    public List<string> Tags { get; set; }
}

$conf = array(
    'password' => 'API key',
    'apiUrl' => 'api.ip1sms.com/v2/',
    'method' => 'POST',
    'endpoint' => 'batches',
);

$message = array(
    "sender" => "iP1",
    "recipients" => ["46712345678"],
    "body" => "Test message rest v2",
    "type" => "sms",
    "datacoding" => "gsm",
    "priority" => 1,
    "reference" => "Test",
    "tags" => ["Test SMS"],
);

$jsonEncodedMessage = json_encode($message);
// Set up request options
$options = array(
    'http' => array(
        'header'  => array(
            'Content-Type: application/json',
            'Authorization: Bearer '.$conf['password'],
            'Content-Length: ' . strlen($jsonEncodedMessage)
        ),
        'method'  => $conf['method'],
        'content' => $jsonEncodedMessage,
    )
);

$url = "https://" . $conf['apiUrl'] . $conf['endpoint'];
$context  = stream_context_create($options);
// Send the request
$response = file_get_contents($url, false, $context);
// Print the response
echo $response;

Imports System.Net.Http
Imports System.Net.Http.Headers
Imports System.Net.Http.Json

Module Module1
    Sub Main()
        Dim client As New HttpClient()

        client.BaseAddress = New Uri("https://api.ip1sms.com/v2/")
        client.DefaultRequestHeaders.Accept.Clear()
        client.DefaultRequestHeaders.Accept.Add(New MediaTypeWithQualityHeaderValue("application/json"))
        client.DefaultRequestHeaders.Authorization = New AuthenticationHeaderValue("Bearer", "API Key")

        Dim sms As New OutgoingSMS()
        sms.Sender = "iP1"
        sms.Recipients = New List(Of String)() From {"46712345678"}
        sms.Body = "Test message rest v2"
        sms.Type = "sms"
        sms.Datacoding = "gsm"
        sms.Priority = 1
        sms.Reference = "Test"
        sms.Tags = New List(Of String)() From {"Test SMS"}

        Dim response As HttpResponseMessage = client.PostAsJsonAsync("batches", sms).Result

        If response.IsSuccessStatusCode Then
            Console.WriteLine("Sent")
        Else
            Console.WriteLine("Failed, " & response.StatusCode.ToString() & ": " & response.Content.ReadAsStringAsync().Result)
        End If
    End Sub
End Module

Public Class OutgoingSMS
    Public Property Sender As String
    Public Property Recipients As List(Of String)
    Public Property Body As String
    Public Property Type As String
    Public Property Datacoding As String
    Public Property Priority As Integer
    Public Property Reference As String
    Public Property Tags As List(Of String)
End Class