Quote Originally Posted by xinno View Post
this topic has so many posts.

i'm having a similar problem as others.

I've got GCO sandbox setup on my shop, and I can click it and checkout. The orders are shown in my GCO account orders section, however nothing appears in ZC. My response_error and response_message logs are blank. Just out of curiosity, at the top of response_handler.php, I wrote some code to write a timestamp to a 3rd file. The 3rd file get written to when I directly to the response handler URL, but it never gets written to when I check out through GCO. I have set the API callback URL to the http://www.sss.com/googlecheckout/response_handler.php file on my site, and the callback method is XML.

I don't know what else to do or try, since it seems GCO will not even attempt to do any thing w/ myu response handler file. (as shown by no timestampe being written to the 3rd file).
Check your API callback URL. Unless you renamed your file, responsehandler.php should not have an underscore in it.