gistfile1.txt

<script src="https://checkout.stripe.com/checkout.js"></script>

<button id="customButton">Purchase</button>

<script>
  var handler = StripeCheckout.configure({
    key: 'pk_test_ahu1YHgH8D5BMaKmm3IX3aav',
    image: '/square-image.png',
    token: function(token, args) {
      // Use the token to create the charge with a server-side script.
    }
  });

  document.getElementById('customButton').addEventListener('click', function(e) {
    // Open Checkout with further options
    handler.open({
      name: 'S x 3',
      description: '2 widgets ($20.00)',
      amount: 2000
    });
    e.preventDefault();
  });
</script>