Quote Originally Posted by Gunzanroses View Post
This is getting frustrating... could someone please tell me how to fix this error that i get when checking out using the sandbox.

Your server returned no data in its response; Checkout requires data of type merchant-calculation-results in response to merchant-calculation-callback

i have set my api url call back to the response handler. I believe this to be one reason i am not getting shipping quotes? My apologies is someone has answered this question in this thread but i have been sifting through posts for 2 hours and nothing. This thread is freaking huge! any help would be fantastic!
When you click on the actual error on the google checkout integration tab, what's the full error description? Are you sure your sandbox is pointing to the right responsehandler.php? Are you using your sandbox merchant id (which is different than production)? Did you set the url callback for sandbox to http or https and if https do you have one of Googlecheckout supported SSL installed?

Have you configured shipping accurately in both Zen Cart admin and googlecheckout? When you test your respondhandler using the test tool did you get any error?