Google Checkout and App Engine

I've followed the Order Processing tutorial to receive and handle order notifications in my GAE application from Google Checkout.

Everything works OK in the sandbox environment. I can send a fake order and the app gets a notification and handles the order.

When I switch to the production environment and make a real order, I can see the order in the Google Checkout Merchant account but I don't receive any notifications.

To switch to production I 开发者_StackOverflowsimply edit my ApiContext object to use Environment.Production and the real merchant id and key. The Integration settings are the same. I've also tried changing the callback URL to use HTTPS (https://blah.appspot.com/not) but still nothing.

What am I missing?

The "Integration Console" in the Checkout Merchant Center gives you information about the callbacks (XML sent, XML received, HTTP errors, etc.). Hopefully you can figure out the problem from that data. Some related links below:

https://checkout.google.com/support/sell/bin/answer.py?hl=en&answer=72217

http://code.google.com/apis/checkout/developer/Google_Checkout_XML_API.html#integration_issues_console

http://code.google.com/apis/checkout/articles/Troubleshoot_Integration_Console_Errors.html