Sample Code by 2Factor

CURL *hnd = curl_easy_init();

curl_easy_setopt(hnd, CURLOPT_CUSTOMREQUEST, "POST");
curl_easy_setopt(hnd, CURLOPT_URL, "http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS");

curl_easy_setopt(hnd, CURLOPT_POSTFIELDS, "{\"From\": \"{SenderId}\",\"To\": \"{CommaSeparatedContacts}\", \"Msg\": \"{MessageBody}\", \"SendAt\": \"{OptionScheduleTime}\"}");

CURLcode ret = curl_easy_perform(hnd);

var client = new RestClient("http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS");
var request = new RestRequest(Method.POST);
request.AddParameter("undefined", "{\"From\": \"{SenderId}\",\"To\": \"{CommaSeparatedContacts}\", \"Msg\": \"{MessageBody}\", \"SendAt\": \"{OptionScheduleTime}\"}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);

package main

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

func main() {

	url := "http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS"

	payload := strings.NewReader("{\"From\": \"{SenderId}\",\"To\": \"{CommaSeparatedContacts}\", \"Msg\": \"{MessageBody}\", \"SendAt\": \"{OptionScheduleTime}\"}")

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

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := ioutil.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}

OkHttpClient client = new OkHttpClient();

MediaType mediaType = MediaType.parse("application/json");
RequestBody body = RequestBody.create(mediaType, "{\"From\": \"{SenderId}\",\"To\": \"{CommaSeparatedContacts}\", \"Msg\": \"{MessageBody}\", \"SendAt\": \"{OptionScheduleTime}\"}");
Request request = new Request.Builder()
  .url("http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS")
  .post(body)
  .build();

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

HttpResponse<String> response = Unirest.post("http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS")
  .body("{\"From\": \"{SenderId}\",\"To\": \"{CommaSeparatedContacts}\", \"Msg\": \"{MessageBody}\", \"SendAt\": \"{OptionScheduleTime}\"}")
  .asString();

var settings = {
  "async": true,
  "crossDomain": true,
  "url": "http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS",
  "method": "POST",
  "headers": {},
  "processData": false,
  "data": "{\"From\": \"{SenderId}\",\"To\": \"{CommaSeparatedContacts}\", \"Msg\": \"{MessageBody}\", \"SendAt\": \"{OptionScheduleTime}\"}"
}

$.ajax(settings).done(function (response) {
  console.log(response);
});

var data = JSON.stringify({
  "From": "{SenderId}",
  "To": "{CommaSeparatedContacts}",
  "Msg": "{MessageBody}",
  "SendAt": "{OptionScheduleTime}"
});

var xhr = new XMLHttpRequest();
xhr.withCredentials = true;

xhr.addEventListener("readystatechange", function () {
  if (this.readyState === this.DONE) {
    console.log(this.responseText);
  }
});

xhr.open("POST", "http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS");

xhr.send(data);

var http = require("http");

var options = {
  "method": "POST",
  "hostname": "2factor.in",
  "port": null,
  "path": "/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS",
  "headers": {}
};

var req = http.request(options, function (res) {
  var chunks = [];

  res.on("data", function (chunk) {
    chunks.push(chunk);
  });

  res.on("end", function () {
    var body = Buffer.concat(chunks);
    console.log(body.toString());
  });
});

req.write(JSON.stringify({ From: '{SenderId}',
  To: '{CommaSeparatedContacts}',
  Msg: '{MessageBody}',
  SendAt: '{OptionScheduleTime}' }));
req.end();

var request = require("request");

var options = { method: 'POST',
  url: 'http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS',
  body: 
   { From: '{SenderId}',
     To: '{CommaSeparatedContacts}',
     Msg: '{MessageBody}',
     SendAt: '{OptionScheduleTime}' },
  json: true };

request(options, function (error, response, body) {
  if (error) throw new Error(error);

  console.log(body);
});

var unirest = require("unirest");

var req = unirest("POST", "http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS");

req.type("json");
req.send({
  "From": "{SenderId}",
  "To": "{CommaSeparatedContacts}",
  "Msg": "{MessageBody}",
  "SendAt": "{OptionScheduleTime}"
});

req.end(function (res) {
  if (res.error) throw new Error(res.error);

  console.log(res.body);
});

#import <Foundation/Foundation.h>
NSDictionary *parameters = @{ @"From": @"{SenderId}",
                              @"To": @"{CommaSeparatedContacts}",
                              @"Msg": @"{MessageBody}",
                              @"SendAt": @"{OptionScheduleTime}" };

NSData *postData = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:nil];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS"]
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                   timeoutInterval:10.0];
[request setHTTPMethod:@"POST"];
[request setHTTPBody:postData];

NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
                                            completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                                if (error) {
                                                    NSLog(@"%@", error);
                                                } else {
                                                    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
                                                    NSLog(@"%@", httpResponse);
                                                }
                                            }];
[dataTask resume];

open Cohttp_lwt_unix
open Cohttp
open Lwt

let uri = Uri.of_string "http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS" in
let body = Cohttp_lwt_body.of_string "{\"From\": \"{SenderId}\",\"To\": \"{CommaSeparatedContacts}\", \"Msg\": \"{MessageBody}\", \"SendAt\": \"{OptionScheduleTime}\"}" in

Client.call ~body `POST uri
>>= fun (res, body_stream) ->
  (* Do stuff with the result *)

<?php

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => "http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "{\"From\": \"{SenderId}\",\"To\": \"{CommaSeparatedContacts}\", \"Msg\": \"{MessageBody}\", \"SendAt\": \"{OptionScheduleTime}\"}",
));

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

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

<?php

$request = new HttpRequest();
$request->setUrl('http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS');
$request->setMethod(HTTP_METH_POST);

$request->setBody('{"From": "{SenderId}","To": "{CommaSeparatedContacts}", "Msg": "{MessageBody}", "SendAt": "{OptionScheduleTime}"}');

try {
  $response = $request->send();

  echo $response->getBody();
} catch (HttpException $ex) {
  echo $ex;
}

<?php

$client = new http\Client;
$request = new http\Client\Request;

$body = new http\Message\Body;
$body->append('{"From": "{SenderId}","To": "{CommaSeparatedContacts}", "Msg": "{MessageBody}", "SendAt": "{OptionScheduleTime}"}');

$request->setRequestUrl('http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS');
$request->setRequestMethod('POST');
$request->setBody($body);

$client->enqueue($request)->send();
$response = $client->getResponse();

echo $response->getBody();

import http.client

conn = http.client.HTTPConnection("2factor.in")

payload = "{\"From\": \"{SenderId}\",\"To\": \"{CommaSeparatedContacts}\", \"Msg\": \"{MessageBody}\", \"SendAt\": \"{OptionScheduleTime}\"}"

conn.request("POST", "/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS", payload)

res = conn.getresponse()
data = res.read()

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

import requests

url = "http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS"

payload = "{\"From\": \"{SenderId}\",\"To\": \"{CommaSeparatedContacts}\", \"Msg\": \"{MessageBody}\", \"SendAt\": \"{OptionScheduleTime}\"}"
response = requests.request("POST", url, data=payload)

print(response.text)

require 'uri'
require 'net/http'

url = URI("http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS")

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

request = Net::HTTP::Post.new(url)
request.body = "{\"From\": \"{SenderId}\",\"To\": \"{CommaSeparatedContacts}\", \"Msg\": \"{MessageBody}\", \"SendAt\": \"{OptionScheduleTime}\"}"

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

curl --request POST \
  --url http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS \
  --data '{"From": "{SenderId}","To": "{CommaSeparatedContacts}", "Msg": "{MessageBody}", "SendAt": "{OptionScheduleTime}"}'

echo '{"From": "{SenderId}","To": "{CommaSeparatedContacts}", "Msg": "{MessageBody}", "SendAt": "{OptionScheduleTime}"}' |  \
  http POST http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS

wget --quiet \
  --method POST \
  --body-data '{"From": "{SenderId}","To": "{CommaSeparatedContacts}", "Msg": "{MessageBody}", "SendAt": "{OptionScheduleTime}"}' \
  --output-document \
  - http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS

import Foundation
let parameters = [
  "From": "{SenderId}",
  "To": "{CommaSeparatedContacts}",
  "Msg": "{MessageBody}",
  "SendAt": "{OptionScheduleTime}"
]

let postData = NSJSONSerialization.dataWithJSONObject(parameters, options: nil, error: nil)

var request = NSMutableURLRequest(URL: NSURL(string: "http://2factor.in/API/V1/{api_key}/ADDON_SERVICES/SEND/TSMS")!,
                                        cachePolicy: .UseProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.HTTPMethod = "POST"
request.HTTPBody = postData

let session = NSURLSession.sharedSession()
let dataTask = session.dataTaskWithRequest(request, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    println(error)
  } else {
    let httpResponse = response as? NSHTTPURLResponse
    println(httpResponse)
  }
})

dataTask.resume()