stripe.js

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

<button id="btn2" class="btn btn-success btn-lg btn-block">

<span class="text-uppercase"><span class="text-white-dark">Buy now for</span> $<%= "#{settings.price2}" %></span>

</button>

<script>
  var handler = StripeCheckout.configure({
    key: 'pk_test_1DU6AgiPLPgyzdgvhHy3jTVb',
    image: '<%= settings.image_link %>',
    token: function(token, args) {
      // Use the token to create the charge with a server-side script.
    }
  });

  document.getElementById('btn2').addEventListener('click', function(e) {
    // Open Checkout with further options
    handler.open({
      name: '<%= "#{settings.homepage}" %>',
      description: '<%= "#{settings.price2_value} - Set" %>',
      amount: <%= "#{settings.price2}" %>,
      billingAddress: "true",
      shippingAddress: "true"
    });
    e.preventDefault();
  });
</script>