
Originally Posted by
mahdiusman
I see that it is working for you, but there are many out there who are having issues with googlechekout.
Can anybody give any idea why is this happening?
Site have SSL.?
Did you put correct credentials for live and sandbox?
log folder is writeable?
And most important 
HTML Code:
.htaccess Basic Authentication Mode
Your site Site in installed with PHP over CGI?
This configuration will disable PHP Basic Authentication that is NOT compatible with CGI used in the responsehandler.php to validate Google Checkout messages.
If setted True you MUST configure your .htaccess files here.
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