My orders are showing up in the Customer Orders section and are listed as pending. When I log in to my sandbox account there are no orders there.

If I do https://www.mydomain.com/cart/google...nsehandler.php

I see the following:
Mon Apr 9 15:37:02 US Mountain Standard Time 2007:- Invalid

Is that causing the problem?
I'm in Michigan so the time should be eastern time; however, I do not see where to change it in the admin section.

Other than no orders showing up in my sandbox account everything else seems to be working great. I go through the order process and the confirmation email is sent to my test user.

Misc Information about my setup:

I am testing using the sandbox for googlecheckout with the latest versions of zen-cart and googlecheckout. (downloaded from Ropu's sig)

I have activated the sandbox account and set the Integration settings to the following:

API callback: https://www.mydomain.com/cart/google...nsehandler.php

Callback method: XML

Shopping cart post security checkbox is checked.

I do have SSL enabled.
I am on a shared windows server that has PHP4 and curl installed.
The MySQL 5 database is set to cache to the database.

Since I do not have the getallheaders function I had to comment out the security authentication checks. I did Ropu's recommendation of creating the .htaccess and .htpassword files.

I've checked for spaces in my merchant key and merchant ID and both look good. I got them from the sandbox account and double checked that I am not using my production keys.