1. Login to your MailRefine account.
  2. Then go to the setting option. 


        3. At first click on the API button then click Genetare API Token. 


       4. Write the Token name, where you use this API.


        5. Copy your API key by clicking the copy button.


6. Verify Email Address JavaScript Widget

Your MailRefine API Token Is: [YOUR API KEY]

Note: Form id and Input id cannot be changed.


<form id="mailrefine-form">

  <input id="mailrefine-email" />

  <input type="submit" value="Submit" style="display: block; margin-top: 20px" />

</form>

<script>

  var API_TOKEN = '[YOUR API KEY]'

</script>

<script src="https://app.mailrefine.com/js/verification.js"></script>