Two-factor Authentication API

You can use Two-factor Authentication API to prove a user's identity. Provision a US Short Code with a standard or custom template that specifies the custom parameters for two-factor authentication (2FA) messages. These APIs support 2FA for the US and Canada.

Two-factor authentication (also known as 2FA) provides user identification by combining two different components. In this case, a phone number associated with your user and a PIN. Before you use this API you have to Setup a Pre-approved Short Code for 2FA.

The workflow for Two-factor Authentication API is:

Two-factor Authentication workflow

Send a 2FA request.
Check the response codes in the response and ensure that you sent the request to Nexmo correctly.
Nexmo delivers your PIN to your user's handset. Your user enters this PIN into your APP.
Receive the delivery receipt at your webhook endpoint and verify delivery.

To ensure that your traffic is send over the best possible route, use Conversion API to tell us about the reliability of your 2FA communication. Adding your conversion data means Nexmo delivers your messages faster and more reliably.

Note: Nexmo calcualtes quality of delivery (QoD) statistics using delivery receipts (DLR). In the United States, we only receive intermediate and not handset DLRs. This means Dashboard analytics cannot show QoD statistics for messages sent via the US short code API.

Implementing the Two-factor Authentication API workflow

To use the 2FA API you:

Send a 2FA request.

Node.js
PHP
Python
Ruby

var https = require('https');

var data = JSON.stringify({
 api_key: 'API_KEY',
 api_secret: 'API_SECRET',
 to: '441632960960',
 pin: 'A_PIN'
});

var options = {
 host: 'rest.nexmo.com',
 path: '/sc/us/2fa/json',
 port: 443,
 method: 'POST',
 headers: {
   'Content-Type': 'application/json',
   'Content-Length': Buffer.byteLength(data)
 }
};

var req = https.request(options);

req.write(data);
req.end();

var responseData = '';
req.on('response', function(res){
 res.on('data', function(chunk){
   responseData += chunk;
 });

 res.on('end', function(){
   console.log(JSON.parse(responseData));
 });
});

<?php
$url = 'https://rest.nexmo.com/sc/us/2fa/json?' . http_build_query([
        'api_key' => 'API_KEY',
        'api_secret' => 'API_SECRET',
        'to' => '441632960960',
        'pin' => 'A_PIN'
    ]);
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);

import urllib

params = {
    'api_key': 'API_KEY',
    'api_secret': 'API_SECRET',
    'to': '441632960960',
    'pin' : 'A_PIN'
}

url = 'https://rest.nexmo.com/sc/us/2fa/json?' + urllib.urlencode(params)

response = urllib.urlopen(url)
print response.read()

require "net/http"
require "uri"

uri = URI.parse("https://rest.nexmo.com/sms/json")
params = {
    'api_key' => 'API_KEY',
    'api_secret' => 'API_SECRET',
    'to' => '441632960960',
    'pin' => 'A_PIN'
}

response = Net::HTTP.post_form(uri, params)

puts response.body

Check the response codes in the response and ensure that you sent the request to Nexmo correctly.

Node.js
PHP
Python
Ruby

// Decode the json object you retrieved when you ran the request.

var decodedResponse = JSON.parse(responseData);

console.log('You sent ' + decodedResponse['message-count'] + ' messages.\n');

decodedResponse['messages'].forEach(function(message) {
    if (message['status'] === "0") {
      console.log('Success ' + decodedResponse['message-id']);
    }
    else {
      console.log('Error ' + decodedResponse['status']  + ' ' +  decodedResponse['error-text']);
    }
});

<?php
// Decode the json object you retrieved when you ran the request.
$decoded_response = json_decode($response, true);

error_log('You sent ' . $decoded_response['message-count'] . ' messages.');

foreach ( $decoded_response['messages'] as $message ) {
    if ($message['status'] == 0) {
        error_log("Success " . $message['message-id']);
    } else {
        error_log("Error {$message['status']} {$message['error-text']}");
    }
}

import json

#Using the response object from the request

if response.code == 200 :
    data = response.read()
    #Decode JSON response from UTF-8
    decoded_response = json.loads(data.decode('utf-8'))
    # Check if your messages are succesful
    messages = decoded_response["messages"]
    for message in messages:
        if message["status"] == "0":
            print "success"
else :
    #Check the errors
    print "unexpected http {code} response from nexmo api". response.code

require 'json'

# Decode the json object from the response object you retrieved from the request.
if response.kind_of? Net::HTTPOK
  decoded_response = JSON.parse(response.body )

  messagecount = decoded_response["message-count"]

  decoded_response["messages"].each do |message|
    if message["status"] == "0"
        p "message " + message["message-id"] + " sent successfully.\n"
      else
        p "message has error " + message["status"]  + " " + message["error-text"]
    end
  end
else
  puts response.code + " error sending message"
end

Nexmo delivers your PIN to your user's handset. Your user enters this PIN into your APP.

Receive the delivery receipt at your webhook endpoint so you can see:

If the status was successful.
When and how the call was made.
How much the call cost.

Node.js
PHP
Python
Ruby

var app = require('express')();
app.set('port', (process.env.PORT || 5000));
app.use(require('body-parser').urlencoded({
    extended: false
}));
// Handle GET webhook
app.get('/delivery-receipt-webhook', function(req, res) {
    handleWebhook(req.query, res);
});
// Handle POST webhook
app.post('/delivery-receipt-webhook', function(req, res) {
    handleWebhook(req.body, res);
});

function handleWebhook(params, res) {
    if (!params['status'] || !params['messageId']) {
        console.log('This is not a delivery receipt');
    } else {
        //This is a DLR, check that your message has been delivered correctly
        if (params['status'] !== 'delivered') {
            console.log("Fail:", params['status'], ": ", params['err-code']);
        } else {
            console.log("Success");
          /*
            * The following parameters in the delivery receipt should match the ones
            * in your request:
            * Request - from, dlr - to\n
            * Response - message-id, dlr - messageId
            * Request - to, Responese - to, dlr - msisdn
            * Request - client-ref, dlr - client-ref
           */
        }
    }
    res.sendStatus(200);
}
app.listen(app.get('port'), function() {
    console.log('Example app listening on port', app.get('port'));
});

<?php
// work with get or post
$request = array_merge($_GET, $_POST);

// Check that this is a delivery receipt.
if (!isset($request['messageId']) OR !isset($request['status'])) {
    error_log('This is not a delivery receipt');
    return;
}

//Check if your message has been delivered correctly.
if ($request['status'] == 'delivered') {
    error_log("Your message to {$request['msisdn']} (message id {$request['messageId']}) was delivered.");
    error_log("The cost was {$request['price']}.");
} elseif ($request['status'] != 'accepted') {
    error_log("Your message to {$request['msisdn']} (message id {$request['messageId']}) was accepted by the carrier.");
    error_log("The cost was {$request['price']}.");
} else {
    error_log("Your message to {$request['msisdn']} has a status of: {$request['status']}.");
    error_log("Check err-code {$request['err-code']} against the documentation.");
}

#To run this code, replace the MyHandler in
#https://wiki.python.org/moin/BaseHttpServer With the following code,
from urlparse import urlparse, parse_qs
class MyHandler(BaseHTTPServer.BaseHTTPRequestHandler):
    def do_GET(s):
        """Tell Nexmo that you have recieved the GET request."""
        s.send_response(200)
        s.send_header("Content-type", "text/html")
        s.end_headers()
        """Parse parameters in the GET request"""
        parsed_path = urlparse(s.path)
        try:
                delivery_receipt = dict(
                [p.split('=') for p in parsed_path[4].split('&')])
        except:
                delivery_receipt = {}

            """Check the is a delivery receipt"""
        if 'text' in delivery_receipt:
            print ("This is not a delivery receipt")
        elif delivery_receipt['status'] != "delivered":
            print "Fail:" + delivery_receipt['status']
            + ": " + delivery_receipt['err-code'] +  ".\n"
        else:
            print "success"
                """Handle the DLR for a message sent succesfully
                    The following parameters in the delivery receipt should
                    match the ones in your request:
                     * Request - from, dlr - to
                     * Response - message-id, dlr - messageId
                     * Request - to, Responese - to, dlr - msisdn
                     * Request - client-ref, dlr - client-ref
                    Use the documentation to check the values."""

require 'socket'
require 'uri'

def handle_delivery_receipt(request_line)
#Parse the parameters and check if the message was delivered
  params = URI::decode_www_form(request_line).to_h
  if params["status"].nil? or params["messageId"].nil?
    p ('This is not a delivery receipt')
  elsif params["status"] != 'delivered'
    p ("Your request " + params["status"] +
    "because of " + params["err-code"] );
  else
    p ("Success for request " + params['messageId'] )
  end
end

# Initialize a TCPServer
server = TCPServer.new('', 9999)

# Wait for connections
loop do
  # Wait until a client connects
  socket = server.accept

  method, path = socket.gets.split
  handle_delivery_receipt(path)

  # Return the 200 so Nexmo does not send the DLR to you repeatedly
  socket.print "HTTP/1.1 200 OK"
  # Close the socket, terminating the connection
  socket.close
end

Note: remember to return a status code when you receive the delivery receipt.