Google Checkout can be enabled on your store to allow customers to use their Google Checkout account or process a credit card transaction using the Google Checkout system.

When using Google Checkout, billing (payment) is completed on the Google Checkout site and not on your own website. Customers are redirected to the Google Checkout system after submitting the “Process” order button on the ‘Order Review’ page.

To enabled Google Checkout as your payment provider, go to ‘Store Setup’ > Checkout URL, SSL Settings & Payment Provider Selection (Main Configuration)  and select ‘Google Checkout’ as the payment processor type.

After enabled Google Checkout as your payment provider, you must enter your Google Checkout API information on the configuration screen at: ‘Store Setup’ > Google Checkout Configuration | Settings

Your server must be using SSL in order to receive order notifications from Google Checkout. Before implementing Google Checkout, make sure that you have entered a Shared SSL address or your domain's https: address (SSL) in the Checkout URL configuration screen.

Note: In order to save orders processed through Google Checkout correctly, you must first setup some preferences inside your Google Merchant Checkout Account Manager (This only has to be done once. However, if you are testing Google Checkout Transactions using Sandbox, you will need to repeat the instructions below for both your Sandbox and Live Google Checkout accounts. If you are not using Sandbox for testing, simply enabled the preferences below in your Live Google Checkout Account)

• Log in to your Google merchant account.

• Click on the Settings tab.

• Click the Integration link on the left side of the page.

• Enter your URL callback (replace your domain name) and paste it in the API Callback URL field:
  http://www.yoursitename.com/sitestorepro/checkout/google/process.asp
  (Note the URL above must start with https://. If it does not, you will need to enable SSL on your hosting account.)

• Expand the list of advanced settings

• Check the box next to the setting that says, "Provide the first name, last name and full name of the buyer and order recipient in separate fields in the new order notification."

• Check the box next to the setting that says, "Require notification acknowledgments to specify the serial number of the notification."

• Click the Save button to update your settings.

You will also need to enter your Google Merchant ID and Merchant Key in the configuration screen: