_paypal_checkout.html.erb

<%- if(RAILS_ENV == 'development')
      submit_url = Spree::Paypal::Config[:sandbox_url]
    else
      submit_url = Spree::Paypal::Config[:paypal_url]
    end
%>
<%= form_tag submit_url do %> 

  <input id="business" name="business" type="hidden" value="<%= Spree::Paypal::Config[:account] %>" />
  <input id="invoice" name="invoice" type="hidden" value="<%= @order.number %>" />
  
  <% @order.line_items.each_with_index do |item, index| %>
    <%- if item.variant.respond_to?(:paypal_name) %>
      <input id="item_name_<%= index + 1 %>" name="item_name_<%= index + 1 %>" type="hidden" value="<%=  item.variant.paypal_name  %>"  />
    <% else %>
      <input id="item_name_<%= index + 1 %>" name="item_name_<%= index + 1 %>" type="hidden" value="<%= item.variant.product.name %>" />
    <% end %>
    <input id="amount_<%= index + 1 %>" name="amount_<%= index + 1 %>" type="hidden" value="<%= item.price %>" />
    <input id="quantity_<%= index + 1 %>" name="quantity_<%= index + 1 %>" type="hidden" value="<%= item.quantity %>" />
  <% end %>
  
  <input id="currency_code" name="currency_code" type="hidden" value="<%= Spree::Paypal::Config[:currency_code] %>" />
  <input id="handling_cart" name="handling_cart" type="hidden" value="<%= @order.ship_total %>" /> 
  <input id="tax_cart"      name="tax_cart"      type="hidden" value="<%= @order.tax_total %>" />
  
  
  <input id="cmd" name="cmd" type="hidden" value="_cart" />
  <input type="hidden" name="upload" value="1" />
  <input id="notify_url" name="notify_url" type="hidden" value="<%= payment_notifications_url %>" />
  <input type="hidden" name="rm" value ="2" />
  <input id="return" name="return" type="hidden" value="<%= Spree::Paypal::Config[:success_url] %>" />
  
  <input id="charset" name="charset" type="hidden" value="utf-8" />
  
  <% if(Spree::Paypal::Config[:populate_address] && @order.bill_address) %>
    <input type="hidden"  name="address1"    id="address1" value="<%= @order.bill_address.address1 %>" />
    <input type="hidden"  name="address2"    id="address2" value="<%= @order.bill_address.address2 %>" />
    <input type="hidden"  name="city"        id="city"     value="<%= @order.bill_address.city %>"     />
    <input type="hidden"  name="country"     id="country"  value="<%= @order.bill_address.country.iso %>" />
    <input type="hidden"  name="email"       id="email"    value="<%= @order.email %>"                 />
    <input type="hidden"  name="first_name"  id="first_name" value="<%= @order.bill_address.firstname %>" />
    <input type="hidden"  name="last_name"   id="last_name"  value="<%= @order.bill_address.lastname %>"  />
    <input type="hidden"  name="zip"         id="zip"      value="<%= @order.bill_address.zipcode %>"     />
    <input type="hidden"  name="night_phone_b"         id="night_phone_b"      value="<%= @order.bill_address.phone %>"     />
  <% end %>

  <%= image_submit_tag "pp_checkout.gif" %>

<% end -%>