Setting up test accounts in Google Checkout Sandbox service

If you wish to experiment with Google Checkout before offering the service to your customers, create two test accounts in the Sandbox. The Sandbox is a development system that is designed to help you test your Google Checkout implementation. One of your Sandbox accounts needs to function as a customer account and the other needs to function as your merchant account.

Sign in to your test merchant account at https://sandbox.google.com/sell to locate your Merchant ID and Merchant Key for Test mode. You will need to specify these values on the module configuration page of the admin menu when running your Google Checkout module in Test mode. In your merchant account, both your Merchant ID and your Merchant Key are listed in the 'Integration' section ('Settings' tab->'Integration') under the 'Account information' header.