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<!-- create form with open_form() -->
<form action="http://testapp.com/login" method="post" accept-charset="utf-8" id="login-form" class="login">
  <div style="display:none">
    <input type="hidden" name="csrf_test_name" value="80bfb80b356d6d31f4ce4dad0c6cf69e">
  </div>
  ...
  ...
</form>
 
<!-- Update AJAX code to post serialized data -->
<script type="text/javascript">
$.post( ajax_url, $('#login-form').serialize(), function( response ) {
    // response
}, 'json' );
</script>