C#

Requirements

Make sure you have imported the following namespaces

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

Sending Single SMS

var jwtToken = "YOUR JWT TOKEN";
var phone = "0912*******";
var message = "Hi, there";

using (var client = new HttpClient())
{

    client.DefaultRequestHeaders.Add("Authorization", $"Bearer {jwtToken}");

    var data = new
    {
        phoneNumber = phone,
        message = message
    };
    var content = new StringContent(JsonConvert.SerializeObject(data), Encoding.UTF8, "application/json");
    var response = await client.PostAsync("https://api.bitel.rest/api/v2/sms/single", content);

    var responseStr = await response.Content.ReadAsStringAsync();
    var result = JsonConvert.DeserializeObject<JObject>(responseStr);
    if (response.StatusCode != HttpStatusCode.OK)
    {
        Console.WriteLine("error: {0}", result["error"]);
    }
    else
    {
        var result = result["result"];
        Console.WriteLine("result is: {0}", result);
    }
}

Sending Peer to Peer SMS

var jwtToken = "YOUR JWT TOKEN";
var phones = new[] { "0912*******", "0912*******" };
var messages = new[] { "Hi, there", "hello" };

using (var client = new HttpClient())
{

    client.DefaultRequestHeaders.Add("Authorization", $"Bearer {jwtToken}");

    var data = new
    {
        phoneNumbers = phones,
        messages = messages
    };
    var content = new StringContent(JsonConvert.SerializeObject(data), Encoding.UTF8, "application/json");
    var response = await client.PostAsync("https://api.bitel.rest/api/v2/sms/batch/p2p", content);

    var responseStr = await response.Content.ReadAsStringAsync();
    var result = JsonConvert.DeserializeObject<JObject>(responseStr);
    if (response.StatusCode != HttpStatusCode.OK)
    {
        Console.WriteLine("error: {0}", result["error"]);
    }
    else
    {
        var result = result["result"];
        Console.WriteLine("result is: {0}", result);
    }
}

Sending OTP Code

var jwtToken = "YOUR JWT TOKEN";
var phone = "0912*******";
var text = "1234";

using (var client = new HttpClient())
{

    client.DefaultRequestHeaders.Add("Authorization", $"Bearer {jwtToken}");

    var data = new
    {
        phoneNumber = phone,
        text = text
    };

    var content = new StringContent(JsonConvert.SerializeObject(data), Encoding.UTF8, "application/json");
    var response = await client.PostAsync("https://api.bitel.rest/api/v2/voice/otp", content);

    var responseStr = await response.Content.ReadAsStringAsync();
    var result = JsonConvert.DeserializeObject<JObject>(responseStr);
    if (response.StatusCode != HttpStatusCode.OK)
    {
        Console.WriteLine("error: {0}", result["error"]);
    }
    else
    {
        var result = result["result"];
        Console.WriteLine("result is: {0}", result);
    }
}

Make Single Call

var jwtToken = "YOUR JWT TOKEN";
var phones = "0912*******";
var voiceId = "08e815cbcd724386805103ac0d45e4c2";

using (var client = new HttpClient())
{

    client.DefaultRequestHeaders.Add("Authorization", $"Bearer {jwtToken}");

    var data = new
    {
        phoneNumber = phones,
        voiceId = voiceId
    };
    var content = new StringContent(JsonConvert.SerializeObject(data), Encoding.UTF8, "application/json");
    var response = await client.PostAsync("https://api.bitel.rest/api/v2/voice/single", content);

    var responseStr = await response.Content.ReadAsStringAsync();
    var result = JsonConvert.DeserializeObject<JObject>(responseStr);
    if (response.StatusCode != HttpStatusCode.OK)
    {
        Console.WriteLine("error: {0}", result["error"]);
    }
    else
    {
        var result = result["result"];
        Console.WriteLine("result is: {0}", result);
    }
}