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If you want to implement the Notification API or if you want to perform Merchant Calculations for tax and shipping, Google Checkout requires a valid SSL certificate installed on your server. Until now, we've been accepting SSL certificates issued by a limited number of SSL Certificate Authorities (CA). However, we've added 50 additional root CAs to our list, so you can easily find a suitable SSL certificate for your callback handler. Here's a list of all SSL root CAs accepted by Google Checkout.
On a related note, if you're having trouble receiving notifications or performing merchant calculations even though you have a valid SSL certificate, take a look at this troubleshooting guide.