Delivery Receipts

You can verify that a message you sent using Nexmo's SMS API reached your customer by requesting a delivery receipt from the carrier.

To access the delivery receipt, you need to:

Create a webhook endpoint using one of the code examples shown below
Configure the webhook endpoint in your Nexmo Dashboard

NOTE: After you send a message there may be a delay before you receive the delivery receipt.

Prerequisites

Install dependencies

npm install express body-parser

Initialize your dependencies

Create a file named dlr-express.js and add the following code:

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const app = require('express')()
const bodyParser = require('body-parser')

app.use(bodyParser.json())
app.use(bodyParser.urlencoded({ extended: true }))

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Write the code

Add the following to dlr-express.js:

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app
  .route('/webhooks/delivery-receipt')
  .get(handleDeliveryReceipt)
  .post(handleDeliveryReceipt)

function handleDeliveryReceipt(request, response) {
  const params = Object.assign(request.query, request.body)
  console.log(params)
  response.status(204).send()
}

app.listen(process.env.PORT || 3000)

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Run your code

Save this file to your machine and run it:

node dlr-express.js

Prerequisites

Install dependencies

Add the following to build.gradle:

compile 'com.nexmo:client:5.1.0'
compile 'com.sparkjava:spark-core:2.7.2'

Write the code

Add the following to the main method of the ReceiveDLR class:

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port(3000);

get("/webhooks/delivery-receipt", (req, res) -> {
    for (String param : req.queryParams()) {
        System.out.printf("%s: %s\n", param, req.queryParams(param));
    }
    res.status(204);
    return "";
});

post("/webhooks/delivery-receipt", (req, res) -> {
    // The body will be form-encoded or a JSON object:
    if (req.contentType().startsWith("application/x-www-form-urlencoded")) {
        for (String param : req.queryParams()) {
            System.out.printf("%s: %s\n", param, req.queryParams(param));
        }
    } else {
        IncomingDlrPayload jsonPayload = IncomingDlrPayload.fromJson(req.bodyAsBytes());
        System.out.println(jsonPayload);
    }

    res.status(204);
    return "";
});

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Run your code

We can use the application plugin for Gradle to simplify the running of our application. Update your build.gradle with the following:

apply plugin: 'application'
mainClassName = project.hasProperty('main') ? project.getProperty('main') : ''

Run the following gradle command to execute your application, replacing com.nexmo.quickstart.sms with the package containing ReceiveDLR:

gradle run -Pmain=com.nexmo.quickstart.sms.ReceiveDLR

Prerequisites

Install dependencies

Install-Package Nexmo.Csharp.Client

Initialize your dependencies

Create a file named SMSController.cs and add the following code:

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const string API_KEY = "NEXMO_API_KEY";
const string API_SECRET = "NEXMO_API_SECRET";

var client = new Client(creds: new Nexmo.Api.Request.Credentials(
    nexmoApiKey: API_KEY, nexmoApiSecret: API_SECRET));

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Write the code

Add the following to SMSController.cs:

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[Microsoft.AspNetCore.Mvc.HttpGet]
public ActionResult DLR([FromQuery]SMS.SMSDeliveryReceipt response)
{

    Debug.WriteLine("------------------------------------");
    Debug.WriteLine("DELIVERY RECIEPT");
    Debug.WriteLine("Message ID: " + response.messageId);
    Debug.WriteLine("From: " + response.msisdn);
    Debug.WriteLine("To: " + response.to);
    Debug.WriteLine("Status: " + response.status);
    Debug.WriteLine("------------------------------------");

    return StatusCode(Microsoft.AspNetCore.Http.StatusCodes.Status200OK);
}

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Prerequisites

Install dependencies

composer require slim/slim:^3.8

Initialize your dependencies

Create a file named index.php and add the following code:

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$app = new \Slim\App;

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Write the code

Add the following to index.php:

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$handler = function (Request $request, Response $response) {
    $params = $request->getParsedBody();

    // Fall back to query parameters if needed
    if (!count($params)){
        $params = $request->getQueryParams();
    }

    error_log(print_r($params, true));

    return $response->withStatus(204);
};

$app->get('/webhooks/delivery-receipt', $handler);
$app->post('/webhooks/delivery-receipt', $handler);

$app->run();

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Run your code

Save this file to your machine and run it:

php -f index.php

Prerequisites

Install dependencies

pip install flask

Initialize your dependencies

Create a file named dlr-flask.py and add the following code:

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from flask import Flask, request, jsonify
from pprint import pprint

app = Flask(__name__)

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Write the code

Add the following to dlr-flask.py:

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@app.route('/webhooks/delivery-receipt', methods=['GET', 'POST'])
def delivery_receipt():
    if request.is_json:
        pprint(request.get_json())
    else:
        data = dict(request.form) or dict(request.args)
        pprint(data)
        
    return ('', 204)

app.run(port=3000)

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Run your code

Save this file to your machine and run it:

python dlr-flask.py

Prerequisites

Install dependencies

gem install sinatra sinatra-contrib

Initialize your dependencies

Create a file named delivery_receipt.rb and add the following code:

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require 'sinatra'
require 'sinatra/multi_route'
require 'json'

helpers do
  def parsed_body
     json? ? JSON.parse(request.body.read) : {}
  end

  def json?
    request.content_type == 'application/json'
  end
end

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Write the code

Add the following to delivery_receipt.rb:

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route :get, :post, '/webhooks/delivery-receipt' do
  puts params.merge(parsed_body)
  status 204
end

set :port, 3000

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Run your code

Save this file to your machine and run it:

ruby delivery_receipt.rb

Configure the webhook endpoint in your Nexmo Dashboard

So that Nexmo knows how to access your webhook, you must configure it in your Nexmo account.

In the code snippets, the webhook is located at /webhooks/delivery-receipt. If you are using Ngrok, the webhook you need to configure in your Nexmo Dashboard API Settings page is of the form https://demo.ngrok.io/webhooks/delivery-receipt. Replace demo with the subdomain provided by Ngrok and enter your endpoint in the field labeled Webhook URL for Delivery Receipts:

Try it out

Send a message to a mobile number and you will receive a delivery receipt in the following format:

{
  "err-code": "0",
  "message-timestamp": "2020-10-25 12:10:29",
  "messageId": "0B00000127FDBC63",
  "msisdn": "447700900000",
  "network-code": "23410",
  "price": "0.03330000",
  "scts": "1810251310",
  "status": "delivered",
  "to": "Nexmo CLI"
}

NOTE: After you send a message there may be a delay before you receive the delivery receipt.