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Checkout and Order Processing: the Administrative Side

In this fourth part of a five-part series that shows you how to add checkout and order processing capabilities to an ecommerce application based on Ruby-on-Rails, you'll learn how to integrate a PayPal alternative, build the administrative user interface, and more. This article is excerpted from chapter nine of the book Practical Rails Projects, written by Eldon Alameda (Apress; ISBN: 1590597818).

Author Info:
By: Apress Publishing
Rating: 5 stars5 stars5 stars5 stars5 stars / 5
July 16, 2010
  1. · Checkout and Order Processing: the Administrative Side
  2. · Using the Payment Gem
  3. · Implementing the Administrator User Stories
  4. · Implementing the View Order User Story

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Checkout and Order Processing: the Administrative Side - Using the Payment Gem
(Page 2 of 4 )

The Payment gem (developed by Lucas Carlson) is an alternative to Active Merchant that can also be used to integrate with Authorize.Net. It is a bit easier to use than Active Merchant, but it doesn’t support multiple gateways. The project is also not being as actively developed as Active Merchant; the last release was in June 2005.

Downloading and installing the Payment gem is easy. Simply execute the following command:

$ sudo gem install payment

Before you can use the Payment gem, you need to create a configuration file that holds the login name and password to Authorize.Net. Save the following inconfig/payment.yml:

username: <Your login>
transaction_key: <Your password>

Next, add therequireline to theOrdermodel (app/models/order.rb):

  require 'payment/authorize_net'
  include ActiveMerchant::Billing 

  class Order < ActiveRecord::Base

Then change theprocessmethod as follows:

  def process
rescue => e
      logger.error("Order #{id} failed with error message #{e}")
      self.error_message = 'Error while processing order'
      self.status = 'failed'
    self.status == 'processed'

We changed only one line, which allows us to easily switch back to use Active Merchant. As usual, the code for theprocess_with_payment_gemmethod, shown in Listing 9-4, should be added toapp/models/order.rb.

Listing 9-4. The process_with_payment_gem Method

def process_with_payment_gem
transaction = Payment::AuthorizeNet.new(
    :prefs       => "#{RAILS_ROOT}/config/payment.yml",
    :login => 'your login',
    :password => 'your password',
    :url => 'https://test.authorize.net/gateway/transact.dll',
    :amount => total,
    :card_number => card_number,
    :expiration  => "#{card_expiration_month}/#{card_expiration_year}",
    :first_name  => ship_to_first_name,
    :last_name   => ship_to_last_name,
    :ship_to_last_name => ship_to_last_name,
    :ship_to_first_name => ship_to_first_name,
    :ship_to_address => ship_to_address, :ship_to_city => ship_to_city,
    :ship_to_zip => ship_to_postal_code,
    :ship_to_country => ship_to_country,
    :customer_ip => customer_ip,
    :invoice_num => id
      "Card processed successfully.
Response codes:
          authorization: #{transaction.authorization}
          result code: #{transaction.result_code}
          avs code: #{transaction.avs_code}
          transaction id: #{transaction.transaction_id}
          md5: #{transaction.md5}
          cvv2 response: #{transaction.cvv2_response}
          cavv response: #{transaction.cavv_response}"
   self.status = 'processed'
 rescue => e
       self.error_message = transaction.error_message
       self.status = 'failed'

Note that we are specifying the test URL that we received from Authorize.Net here.

We now have all code in place, so perform a manual test by shopping for some books and placing the order on the checkout page. The result should be the same as with Active Merchant: you should see the order on the Authorize.Net Unsettled Transactions page.

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