Most do not run their stie in https mode as Zen Cart will auto switch when necessary. Check your configure.php for standard paths
Code:
// Define the webserver and path parameters
// HTTP_SERVER is your Main webserver: eg-http://www.your_domain.com
// HTTPS_SERVER is your Secure webserver: eg-https://www.your_domain.com
define('HTTP_SERVER', 'http://www.your_domain.com');
define('HTTPS_SERVER', 'https://www.your_domain.com');
// Use secure webserver for checkout procedure?
define('ENABLE_SSL', 'true');
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