1. Google
Checkout with
Ruby on Rails

2. Software Engineer, Consultant, Trainer
http://simplabs.com
Open Source
http://github.com/marcoow
http://github.com/simplabs
Marco Otte-Witte

3. USA/UK only!

4. Merchant Accounts
• Production Merchant Account
https://checkout.google.com/sell
• Sandbox Merchant Accournt
http://sandbox.google.com/checkout/sell
• => Merchant ID, Merchant Key

5. APIs
• HTML and XML APIs
• Notification APIs
• Example uses HTML API via HTTParty

6. Very(!) simple example
• Create Purchase with Google Checkout
• When Google Checkout confirms the
payment handle the Purchase in the app

7. Create Purchase
• Post an HTML Form to Google
• or create via HTML API:
post("/requestForm/Merchant/#{merchant_id}", :body => {
:_type => 'checkout-shopping-cart',
:'shopping-cart.items.item-1.item-name' => product.name,
:'shopping-cart.items.item-1.item-description' => product.description,
:'shopping-cart.items.item-1.quantity' => 1,
:'shopping-cart.items.item-1.unit-price' => price,
:'shopping-cart.items.item-1.unit-price.currency' => currency
})
• => returns serial-number to later identify
the purchase

8. Create Purchase

9. Notifications
• Register for Notifications:
(need SSH tunnel for local development)

10. Complete Purchase
• State Change Notifications:
def callback
type = params[:'_type']
serial_number = params[:'serial-number']
if type == 'order-state-change-notification'
order_state = params[:'new-financial-order-state']
purchase = GoogleCheckoutPurchase.find_by_serial_number(serial_number)
case order_state.try(:downcase)
when 'charged'
purchase.book!
when 'payment_declined', 'cancelled', 'cancelled_by_google'
purchase.fail!
end
end
render :text => "serial-number=#{serial_number}", :status => :ok
rescue
head :internal_server_error
end

11. A lot more can
be done!

12. Resources
• http://code.google.com/intl/de-DE/apis/checkout/
• https://rubygems.org/gems/google4r-checkout

13. Q&A