4 files changed, 126 insertions, 0 deletions
diff --git a/billing/app/controllers/payments_controller.rb b/billing/app/controllers/payments_controller.rb
new file mode 100644
index 0000000..2a76bb1
--- /dev/null
+++ b/billing/app/controllers/payments_controller.rb
@@ -0,0 +1,22 @@
+class PaymentsController < ApplicationController
+  def new
+    @amount = calculate_amount
+  end
+
+  def confirm
+    @result = Braintree::TransparentRedirect.confirm(request.query_string)
+    if @result.success?
+      render :action => "confirm"
+    else
+      @amount = calculate_amount
+      render :action => "new"
+    end
+  end
+
+  protected
+
+  def calculate_amount
+    # in a real app this be calculated from a shopping cart, determined by the product, etc.
+    "100.00"
+  end
+end
diff --git a/billing/app/helpers/braintree_helper.rb b/billing/app/helpers/braintree_helper.rb
new file mode 100644
index 0000000..3d6e887
--- /dev/null
+++ b/billing/app/helpers/braintree_helper.rb
@@ -0,0 +1,50 @@
+module BraintreeHelper
+  class BraintreeFormBuilder < ActionView::Helpers::FormBuilder
+    include ActionView::Helpers::AssetTagHelper
+    include ActionView::Helpers::TagHelper
+
+    def initialize(object_name, object, template, options, proc)
+      super
+      @braintree_params = @options[:params]
+      @braintree_errors = @options[:errors]
+    end
+
+    def fields_for(record_name, *args, &block)
+      options = args.extract_options!
+      options[:builder] = BraintreeFormBuilder
+      options[:params] = @braintree_params && @braintree_params[record_name]
+      options[:errors] = @braintree_errors && @braintree_errors.for(record_name)
+      new_args = args + [options]
+      super record_name, *new_args, &block
+    end
+
+    def text_field(method, options = {})
+      has_errors = @braintree_errors && @braintree_errors.on(method).any?
+      field = super(method, options.merge(:value => determine_value(method)))
+      result = content_tag("div", field, :class => has_errors ? "fieldWithErrors" : "")
+      result.safe_concat validation_errors(method)
+      result
+    end
+
+    protected
+
+    def determine_value(method)
+      if @braintree_params
+        @braintree_params[method]
+      else
+        nil
+      end
+    end
+
+    def validation_errors(method)
+      if @braintree_errors && @braintree_errors.on(method).any?
+        @braintree_errors.on(method).map do |error|
+          content_tag("div", ERB::Util.h(error.message), {:style => "color: red;"})
+        end.join
+      else
+        ""
+      end
+    end
+  end
+end
+
diff --git a/billing/app/views/payments/confirm.html.erb b/billing/app/views/payments/confirm.html.erb
new file mode 100644
index 0000000..5ab851e
--- /dev/null
+++ b/billing/app/views/payments/confirm.html.erb
@@ -0,0 +1,16 @@
+<h1>Payment Result</h1>
+
+<div>Thank you for your payment.</div>
+
+<h2>Transaction Details</h2>
+
+<table>
+  <tr><td>Amount</td><td>$<%= @result.transaction.amount %></td></tr>
+  <tr><td>Transaction ID:</td><td><%= @result.transaction.id %></td></tr>
+  <tr><td>First Name:</td><td><%= h @result.transaction.customer_details.first_name %></td></tr>
+  <tr><td>Last Name:</td><td><%= h @result.transaction.customer_details.last_name %></td></tr>
+  <tr><td>Email:</td><td><%= h @result.transaction.customer_details.email %></td></tr>
+  <tr><td>Credit Card:</td><td><%= h @result.transaction.credit_card_details.masked_number %></td></tr>
+  <tr><td>Card Type:</td><td><%= h @result.transaction.credit_card_details.card_type %></td></tr>
+</table>
+
diff --git a/billing/app/views/payments/new.html.erb b/billing/app/views/payments/new.html.erb
new file mode 100644
index 0000000..092c518
--- /dev/null
+++ b/billing/app/views/payments/new.html.erb
@@ -0,0 +1,38 @@
+<h1>Payment: $<%= h @amount %></h1>
+
+<% if @result -%>
+  <div style="color: red;"><%= h @result.errors.size %> error(s)</div>
+<% end -%>
+
+<%= form_for :transaction,
+     :params => @result && @result.params[:transaction],
+     :errors => @result && @result.errors.for(:transaction),
+     :builder => BraintreeHelper::BraintreeFormBuilder,
+     :url => Braintree::TransparentRedirect.url,
+     :html => {:autocomplete => "off"} do |f| -%>
+  <%= field_set_tag "Customer" do -%>
+    <%= f.fields_for :customer do |c| -%>
+      <div><%= c.label :first_name, "First Name" %></div>
+      <div><%= c.text_field :first_name %></div>
+      <div><%= c.label :last_name, "Last Name" %></div>
+      <div><%= c.text_field :last_name %></div>
+      <div><%= c.label :email, "Email" %></div>
+      <div><%= c.text_field :email %></div>
+    <% end -%>
+  <% end -%>
+  <%= field_set_tag "Credit Card" do -%>
+    <%= f.fields_for :credit_card do |c| -%>
+      <div><%= c.label :number, "Number" %></div>
+      <div><%= c.text_field :number %></div>
+      <div><%= c.label :expiration_date, "Expiration Date (MM/YY)" %></div>
+      <div><%= c.text_field :expiration_date %></div>
+      <div><%= c.label :cvv, "CVV" %></div>
+      <div><%= c.text_field :cvv %></div>
+    <% end -%>
+  <% end -%>
+  <%= hidden_field_tag :tr_data, Braintree::TransparentRedirect.transaction_data(
+    :redirect_url => confirm_payment_url,
+    :transaction => {:type => "sale", :amount => @amount}
+  ) %>
+  <%= f.submit "Submit" %>
+<% end -%>