How to Add Google Checkout to OpenCart

Downloading the Google Checkout Module
1. Open your browser. Type 'www.opencart.com/index.php?route=extension/extension/infoextension_id=18' into the address bar. Press the 'Enter' key.
2. Locate your version of OpenCart. Click on the 'Download' link next to your version.

3. Click on 'Save File' and 'OK' to save the file to your desktop. Wait for the file to download.
Installing the Google Checkout Module
4. Open your favorite FTP program and login to your website using your user name and password.
5. Use your FTP program to navigate to the 'opencart-gcheckout' file on your desktop. Open the file and locate the 'upload' folder.
6. Copy all of the files in the 'upload' folder to the OpenCart folder on your web server. Close your FTP program.
7. Open your browser and login to your OpenCart installation using your user name and password.
8. Select 'Extensions' and then select 'Modules.' Click 'Install' next to the 'Google Checkout Module.' This will automatically create two database tables that are required to run the module.
9. Locate the 'Google Checkout' module on the list of installed modules. Click on the 'Edit' button next to the module name to change the module's configuration values.
10. Set the module to 'Enabled.' Enter your geo zone, Google merchand ID, Google merchant key, currency, merchant calculated shipping preference and callback URL. Set the 'Sandbox' mode to 'No.'
11. Save the new module configuration settings. The Google Checkout module is now ready to use.