[SOLVED] How to convert Opencart 2.2.0.0 to SSL and resolve Undefined Error while editing orders?

Follow these easy steps to convert your Opencart 2.2.0.0 instance from HTTP to HTTPS.

1. Register a CloudFlare account.
2. Add your domain with the Free plan.
3. Change domain nameserver with the ones provided by Cloudflare

4. Click on Crypto menu option and do the following
   a. Order SSL certificate.
   b. Set Always use HTTPS to ON.
   c. Set Require Modern TLS to ON.
   d. Set Automatic HTTPS Rewrites to ON.
5. On the OpenCart 2.2.0.0 admin panel, browse to System / Settings / Server option and set Use SSL to Yes.
6. On CPanel/Webmin
   • Edit .htaccess file in root folder and replace the following

   RewriteCond %{HTTP_HOST} ^domain.com$
   RewriteRule ^/?$ "http\:\/\/www\.domain\.com" [R=301,L]
   

   with

   RewriteCond %{HTTPS_HOST} ^domain.com$
   RewriteRule ^/?$ "https\:\/\/www\.domain\.com" [R=301,L]

   • Edit config.php in public_html (root) folder and replace

   define('HTTPS_SERVER', 'http://www.domain.com/');

   with

   define('HTTPS_SERVER', 'https://www.domain.com/');

   • Edit config.php in public_html/admin folder and replace

   // HTTP
   define('HTTP_SERVER', 'http://www.domain.com/admin/');
   define('HTTP_CATALOG', 'http://www.domain.com/');
   // HTTPS
   define('HTTPS_SERVER', 'http://www.domain.com/admin/');
   define('HTTPS_CATALOG', 'http://www.domain.com/');

   with

   // HTTP
   define('HTTP_SERVER', 'https://www.domain.com/admin/');
   define('HTTP_CATALOG', 'https://www.domain.com/');
   // HTTPS
   define('HTTPS_SERVER', 'https://www.domain.com/admin/');
   define('HTTPS_CATALOG', 'https://www.domain.com/');

   • Edit admin.php, catalog.php, default.php, and install.php in public_html/system/config folder and replace

   $_['site_ssl'] = false;

   with

   $_['site_ssl'] = true;

   • Edit public_html/catalog/controller/common/header.php and replace

   $server = $this->config->get('config_ssl');

   with

   $server = str_replace('http:', 'https:', $this->config->get('config_url'));

   • NOTE: Use this fix to resolve Undefined Error while editing orders in OC 2.2.0.0
     1. Go to public_html/admin/controller/sale/ folder and edit order.php
     2. Replace

     $data['store_url'] = $this->request->server['HTTPS'] ? str_replace("http", "https", $order_info['store_url']) : $order_info['store_url']; 

     with

     $data['store_url'] = $this->request->server['HTTPS'] ? str_replace("http", "http", $order_info['store_url']) : $order_info['store_url']; 

     3. Save the file.
     4. Go to Opencart Admin Panel select Extensions/Modification and click the Refresh button

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