curl -v -X POST https://api.catapult.inetwork.com/v1/users/{userId}/ \
  -u {token}:{secret} \
  -H "Content-type: application/json" \
    -d \
  '
  {
    "to": "+18284467788",
    "from": "+19197124466",
    "text": "Watch out for the construction on I-25 and Hwy 52",
    "receiptRequested" : "all",
    "callbackUrl" : "http://yourserver.com/message/dlr"
  }'

//NodeJS

var Bandwidth = require("node-bandwidth");

var client = new Bandwidth({
    userId    : "YOUR_USER_ID",
    apiToken  : "YOUR_API_TOKEN",
    apiSecret : "YOUR_API_SECRET"
});
var message = {
  from: "+19195551212",  // <-- This must be a Bandwidth number on your account
  to: "+191955512142",
  text: "Hello World",
  receiptRequested: "all",
  callbackUrl: "http://requestb.in",
  tag: Date.now().toString()
};

//Use Promises
client.Message.send(message)
.then(function(message) {
    console.log("Message sent with ID " + message.id);
})
.catch(function(err) {
    console.log(err.message);
});

using System;
using System.Threading.Tasks;
using Bandwidth.Net;
using Bandwidth.Net.Api;

public class Program
{
  //API credentials which can be found on your account page at https://catapult.inetwork.com/pages/login.jsf
  private const string UserId = "u-userID"; //{user_id}
  private const string Token = "t-token"; //{token}
  private const string Secret = "secret"; //{secret}

  public static void Main()
  {
    try
    {
      RunAsync().Wait();
    }
    catch (Exception ex)
    {
      Console.Error.WriteLine(ex.Message);
      Environment.ExitCode = 1;
    }
  }

  private static async Task RunAsync()
  {
    var client = new Client(UserId, Token, Secret);

    await client.Message.SendAsync(new MessageData
    {
      From = "+19195551212",
      To = "+191955512142",
      Text = "Test",
      ReceiptRequested = MessageReceiptRequested.All,
      CallbackUrl = "http://requestb.in"
    });

  }
}