We're happy to announce the much awaited API dashboard in Google Merchant Center which makes it easier for online merchants who use the Google Content API for Shopping to debug their API requests. 

If you’re an API user, you can now view a comprehensive timeline and list of errors that occurred while making requests to the API, sorted by the number of times the errors occurred for faster prioritization. Please view our blog post here:  http://googlecommerce.blogspot.in/2012/02/new-debugging-dashboard-for-google.html for further details.