Code:
http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=314
Zen Cart™ Version: v1.3.9
Version: 1.4.8
Last Updated: Nov 12 2011
Author: Matt Clements
PHP 5.3 Compatible?: Yes
TESTED WITH API 2.0 and 2.5
Notification as XML
Sandbox
################################################################################ ####################__
Automatically authorize the buyer's credit card for the full amount of the order.
Also send notifications with Zencart (TRUE)
When payment is done, notifications from Google Checkout are sent to customer and store.
But if customer click on Return to store, get page Whoops Session time out,
Cart still with products.
No account created,
ZenCart's email notifications not sent.

################################################################################ ##########___
Automatically authorize and charge the buyer's credit card.
Also send notifications with Zencart (TRUE)
When payment is done, notifications from Google Checkout are sent to customer and store.
if customer click on Return to store, checkout success is displayed
Cart without products.
Account created,
ZenCart's email notifications not sent.



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