title: Add cardholder name with Stripe custom checkout
body: <p>Stripe has recently launched Radar 2.0 to improve payment fraud detection.  One of the requirements for using Radar 2.0 is that you need to provide the cardholder name during the purchase.</p>
  
  <p>I'm using the "custom" form of Stripe's <code>checkout.js</code> documented <a href="https://stripe.com/docs/checkout" rel="nofollow noreferrer">here</a>.</p>
  
  <p>The documentation does not tell you how to specify the cardholder name as part of the checkout process.  Has anyone figured this out?</p>
  
  <p>I've copied relevant portions of my implementation below in case that is helpful.</p>
  
  <p>If this can't be done, then I guess Stripe is insisting that people upgrade to Stripe Elements, but if that is that case it would be great for them to say so.</p>
  
  <pre><code>&lt;script src="https://checkout.stripe.com/checkout.js"&gt;&lt;/script&gt;
  
  $(document).ready(function() {
    var stripe_btn = document.getElementById('stripe-btn');
    var handler = StripeCheckout.configure({
      key: 'pk_live_...',
      token: function(token) {
        $("#stripe-token").val(token.id);
        $("#stripe-form").submit();
      }
    });
    stripe_btn.addEventListener('click', function(e) {
      // Open Checkout with further options:
      handler.open({
        email: $('#stripe-btn').data('email')
      });
      e.preventDefault();
    });
  
    // Close Checkout on page navigation:
    window.addEventListener('popstate', function() {
      handler.close();
    });
  });
  </code></pre>