Is your website(s) set up in ZenCart to redirect to the homepage in the event of an error or 404 or 500 or anything?
The checkout_by_Amazon.php file shouldn't redirect you nowhere but instead return a blank page.
If you're cron is running and wget doesn't appear in spiders.txt, there's no need to include the define statement listed below:
PHP Code:
define('SESSION_BLOCK_SPIDERS','False');
But I would recommend readding wget to your spiders.txt file and placing the above statement in your checkout_by_amazon.php to protect your site against wget remote attacks.
Have you done any sort of upgrading to ZenCart? What version are you running now?
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