Google Checkout Installation Add gem 'spree_google_checkout', :git => "git://github.com/railsdog/spree-google-checkout.git" to Gemfile Run rake spree_google_checkout:install Run rake db:migrate Create seller account in Google Checkout Open https://sandbox.google.com/checkout/sell/settings?section=Integration or https://checkout.google.com/sell/settings?section=Integration remember your merchant ID and merchant key set 'API callback URL' to https://your.spree.site/google_checkout_notification select 'Notification as XML' Create a billing integration using http://your.spree.site/admin/payment_methods and set the merchant ID, etc. Set Spree::Config[:allow_ssl_in_production] to true Usage After filling your gateway settings, users can place order through Google Checkout. After placing order through Google Checkout, you can charge it or cancel it from Spree admin-panel.