example.html

<form action="/charge" method="POST">
  <script
    src="https://checkout.stripe.com/checkout.js" class="stripe-button"
    data-key="pk_test_1xBnoR7Mdwx4E1gD2dcgl8TL"
    data-image="https://s3.amazonaws.com/stripe-uploads/acct_14qpC2GuKJ7VdKiHmerchant-icon-1419369420301-10846338_1510038909255594_3532245329824431014_n.jpg"
    data-name="Share Coffee"
    data-description="2 widgets"
    data-amount="2000">
  </script>
  <input type='hidden' value='http://example.com/my-custom-url'/>
</form>