Url : Here is the API callback URL you have to paste into your Google Checkout configuration. This url is used by Google to send a notification to Hikashop and confirm an order.
Merchant Key : Put here your merchant Key. This key is generated by Google in your Google Checkout configuration. It is used to authenticate and verify the integrity of any messages you exchange with Google Checkout.
Sandbox : The Sandbox is used for testing. Once you have tested the plugin, you can pass to a production phase and select "No".
Server to server : If you activate this option, the Google Checkout plugin will use the Google Web Service to transmit the cart information.
Charge and ship: If you activate this option, the order will be automatically validate and set as "shipped" in your Google Checkout account.
Debug: You can activate the debug mode of the Google Checkout payment plugin. If you do so, informations about each notification received from Google Checkout will be logged in the payment log file. You can see and modify the location of this file in the configuration page of HikaShop.
Verified status : Here, you can select the status to set to an order if the plugin receives a successful completion notification from Google Checkout for an order.
Invalid status : Here, you can select the status to set to an order if the plugin receives a notification from Google Checkout for an order with an amount different from the order total or in a different currency. In that case, we highly recommend you to check your Google Checkout account, the order information, and maybe contact your customer, and decide yourself what to do with the order.
Configuration of your Google Checkout account: In order to make the Google Checkout plugin works, you have to set some options in your Google Checkout account. First, go in the integration panel by clicking on Settings > Integration. Then make sure that your account is configured as the following screenshot.