var client = new RestClient("web.it-decision.com/v1/api/send-sms");

client.Timeout = -1;

var request = new RestRequest(Method.POST);

request.AddHeader("Authorization", "Basic api_key");

request.AddHeader("Content-Type", "application/json");

var body = @"{
   ""phone"":380632132121,
   ""sender"":""InfoItd"",
   ""text"":""This is messages DecisionTelecom"",
   ""validity_period"":300
}";

request.AddParameter("application/json", body,  ParameterType.RequestBody);

IRestResponse response = client.Execute(request);

Console.WriteLine(response.Content);

var myHeaders = new Headers();

myHeaders.append("Authorization", "Basic api_key");

myHeaders.append("Content-Type", "application/json");

var raw = JSON.stringify({
  "phone": 380632132121,
  "sender": "InfoItd",
  "text": "This is messages DecisionTelecom",
  "validity_period": 300
});

var requestOptions = {
  method: 'POST',
  headers: myHeaders,
  body: raw,
  redirect: 'follow'
};

fetch("web.it-decision.com/v1/api/send-sms", requestOptions)
  .then(response => response.text())
  .then(result => console.log(result))
  .catch(error => console.log('error', error));

OkHttpClient client = new OkHttpClient().newBuilder()
  .build();

MediaType mediaType = MediaType.parse("application/json");

RequestBody body = RequestBody.create(mediaType, "{\"phone\":380632132121,\"sender\":\"InfoItd\",\"text\":\"This is messages DecisionTelecom\",\"validity_period\":300}");

Request request = new Request.Builder()
  .url("web.it-decision.com/v1/api/send-sms")
  .method("POST", body)
  .addHeader("Authorization", "Basic api_key")
  .addHeader("Content-Type", "application/json")
  .build();

Response response = client.newCall(request).execute();

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'web.it-decision.com/v1/api/send-sms',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_POSTFIELDS =>'{
     "phone":380632132121,
     "sender":"InfoItd",
     "text":"This is messages DecisionTelecom",
     "validity_period":300
  }',
  CURLOPT_HTTPHEADER => array(
    'Authorization: Basic api_key',
    'Content-Type: application/json',
  ),
));

$response = curl_exec($curl);

curl_close($curl);

echo $response;

import http.client

import json

conn = http.client.HTTPSConnection("web.it-decision.com")

payload = json.dumps({
  "phone": 380632132121,
  "sender": "InfoItd",
  "text": "This is messages DecisionTelecom",
  "validity_period": 300
})

headers = {
  'Authorization': 'Basic api_key',
  'Content-Type': 'application/json'
}

conn.request("POST", "/v1/api/send-sms", payload, headers)

res = conn.getresponse()

data = res.read()

print(data.decode("utf-8"))

package main

import (
  "fmt"
  "strings"
  "net/http"
  "io/ioutil"
)

func main() {
  url := "web.it-decision.com/v1/api/send-sms"
  method := "POST"
  payload := strings.NewReader(`{
     "phone":380632132121,
     "sender":"InfoItd",
     "text":"This is messages DecisionTelecom",
     "validity_period":300
  }`)
  client := &http.Client {}

  req, err := http.NewRequest(method, url, payload)

  if err != nil {
    fmt.Println(err)
    return
  }

  req.Header.Add("Authorization", "Basic api_key")

  req.Header.Add("Content-Type", "application/json")

  res, err := client.Do(req)

  if err != nil {
    fmt.Println(err)
    return
  }

  defer res.Body.Close()

  body, err := ioutil.ReadAll(res.Body)

  if err != nil {
    fmt.Println(err)
    return
  }

  fmt.Println(string(body))
}

var axios = require('axios');

var data = JSON.stringify({
  "phone": 380632132121,
  "sender": "InfoItd",
  "text": "This is messages DecisionTelecom",
  "validity_period": 300
});

var config = {
  method: 'post',
  url: 'web.it-decision.com/v1/api/send-sms',
  headers: { 
    'Authorization': 'Basic api_key', 
    'Content-Type': 'application/json'  
 },
  data : data
};

axios(config)
.then(function (response) {
  console.log(JSON.stringify(response.data));
})
.catch(function (error) {
  console.log(error);
});

import http.client

import json

conn = http.client.HTTPSConnection("web.it-decision.com")

payload = json.dumps({
  "phone": 380632132121,
  "sender": "InfoItd",
  "text": "This is messages DecisionTelecom",
  "validity_period": 300
})

headers = {
  'Authorization': 'Basic api_key',
  'Content-Type': 'application/json'
}

conn.request("POST", "/v1/api/send-sms", payload, headers)

res = conn.getresponse()

data = res.read()

print(data.decode("utf-8"))