Secure payment processing

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The website i am working on is http://1800contacts.ca/catalog/. I need to make checkout_payment.php secure in order to take credit card payment. (a.k.a , shows 'https' at the url and the little lock at the bottom of the browser) My webhost told me the link to the secure server is [url]www.webhost4me.com/1800contacts_ca[/url] . I made the following changes: 

In catalog/includes/configure.php:

[code]define('HTTP_SERVER', 'http://1800contacts.ca'); // eg, http://localhost - should not be empty for productive servers
  define('HTTPS_SERVER', 'https://www.webhost4me.com/1800contacts_ca/'); // eg, https://localhost - should not be empty for productive servers
  define('ENABLE_SSL', true); // secure webserver for checkout procedure?
 [/code]

Should I add '/catalog' after both of the above urls? 

In admin/includes/configure.php:

[code]define('HTTP_SERVER', 'http://1800contacts.ca'); // eg, http://localhost or - https://localhost should not be NULL for productive servers
  define('HTTP_CATALOG_SERVER', 'http://1800contacts.ca/catalog');
  define('HTTPS_CATALOG_SERVER', 'https://www.webhost4me.com/1800contacts_ca/catalog');
  define('ENABLE_SSL_CATALOG', 'true'); // secure webserver for catalog module[/code]

Once again, i am not sure whether i should add 'catalog' after the url or not...

After I added some products and checked out, nothing really happens. Can anyone please tell me what did i do wrong? Thanks.