Thanks for your response!! This has been a little frustrating.
Google Checkout setup asks for an API callback URL, which is the responsehandler.php file. I gave them an https path to this file (an https version is required in the 'live' version of Checkout). So far I haven't been able to find where they might ask for a path to the "success" page for downloads. Interesting, because after I make purchases in the sandbox environment, there is a clear link that takes me directly to the "success" page with the downloads on it--no glitches. So somewhere it's being told this path. But where, I don't know.
Any ideas?
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