Step 5: Attach a verified funding source

Next you will attach a verified funding source for Joe Buyer, which will be done using Instant Account Verification (IAV). This method will give Joe Buyer the ability to add and verify his bank account in a matter of seconds by authenticating with his online banking credentials. Once Joe Buyer reaches the page in your application to add a bank account you’ll ask Dwolla’s server to generate an IAV token.

Generate a single-use IAV token for our Customer, Joe Buyer:
Content-Type: application/vnd.dwolla.v1.hal+json
Accept: application/vnd.dwolla.v1.hal+json
Authorization: Bearer 0Sn0W6kzNicvoWhDbQcVSKLRUpGjIdlPSEYyrHqrDDoRnQwE7Q/wKehyh1RTpzjUj5KzIRfDi0wKTii7DqY

HTTP/1.1 200 OK

  "_links": {
    "self": {
      "href": ""
  "token": "lr0Ax1zwIpeXXt8sJDiVXjPbwEeGO6QKFWBIaKvnFG0Sm2j7vL"
customer_url = ''

# Using DwollaV2 - (Recommended)
customer = "#{customer_url}/iav-token"
customer.token # => "lr0Ax1zwIpeXXt8sJDiVXjPbwEeGO6QKFWBIaKvnFG0Sm2j7vL"

// Using dwolla-v2 -
var customerUrl = '';

  .then(res => res.body.token); // => 'lr0Ax1zwIpeXXt8sJDiVXjPbwEeGO6QKFWBIaKvnFG0Sm2j7vL'
# Using dwollav2 - (Recommended)
customer_url = '''%s/iav-token' % customer_url)
$customersApi = new DwollaSwagger\CustomersApi($apiClient);

$fsToken = $customersApi->getCustomerIavToken("");
$fsToken->token; # => "lr0Ax1zwIpeXXt8sJDiVXjPbwEeGO6QKFWBIaKvnFG0Sm2j7vL"

Then, you’ll pass this single-use IAV token to the client-side of your application where it will be used in the JavaScript function dwolla.iav.start. This token will be used to authenticate the request asking Dwolla to render the IAV flow. Before calling this function you’ll want to include dwolla.js in the HEAD of your page.

<script src=""></script>

Next, you’ll add in a container to the body of your page where you want to render the IAV flow.

<div id="mainContainer">
  <input type="button" id="start" value="Add Bank">

<div id="iavContainer"></div>

Now that you have dwolla.js initialized on the page and the container created where you’ll render the IAV flow, you’ll create a JavaScript function that responds to Joe clicking the “Add bank” button on your page. Once Joe clicks “Add Bank”, your application will call dwolla.iav.start() passing in the following arguments: the iavContainer element where IAV will render, a string value of your single-use IAV token, and a callback function that will handle any error or response.

<script type="text/javascript">
$('#start').click(function() {
  var iavToken = 'lr0Ax1zwIpeXXt8sJDiVXjPbwEeGO6QKFWBIaKvnFG0Sm2j7vL';
  dwolla.iav.start(iavToken, {
  container: 'iavContainer',
  stylesheets: [
  microDeposits: false,
  fallbackToMicroDeposits: false
}, function(err, res) {
  console.log('Error: ' + JSON.stringify(err) + ' -- Response: ' + JSON.stringify(res));

Joe Buyer will complete the IAV flow by authenticating with his online banking credentials. You’ll know his bank account was successfully added and verified if you receive a JSON response in your callback that includes a link to the newly created funding source.

Sample Response

Great! Joe Buyer’s funding source is now verified and ready to send money.

Production: Operational

Financial institutions play an important role in the Dwolla network.

Dwolla, Inc. is an agent of Veridian Credit Union and all funds associated with your account in our network are held in one or more pooled accounts at Veridian Credit Union. These funds may not be eligible for share insurance by the National Credit Union Share Insurance Fund. Dwolla, Inc. is the operator of a software platform that communicates user instructions for funds transfers to Veridian Credit Union.