new.html.erb

<%= form_tag charges_path(id: @cart.id) do %>
   <article>
    <%= number_to_currency(@cart.total_price) %>
   </article>
 
   <script src="https://checkout.stripe.com/checkout.js" class="stripe-button"
    data-key="<%= Rails.configuration.stripe[:publishable_key] %>"
    data-description="One-time Charge"
    data-amount="<%= @cart.total_price * 100 %>"
    data-shipping-address="false"
    data-billing-address="false"
    data-email="">
   </script>
   
<% end %>