Recently I worked on a site which is using wordpress as it’s cms and creloaded as it’s web shop. So the wordpress was top of the shopping cart and then the shopping cart as webshop. So basically I had to develop the site using wordpress and then had to install that creloaded inside woordpress installation.

For main site wordpress has it’s header (with navigation), footer (with navigation and other contents), sidebar with widgets etc. So when I am visiting the web shop with creloaded I was required to show the same layouts and design. For that I had to use wp xmlrpc to fetch those common features into creloaded system.

XML-RPC functionality is turned on by default since WordPress 3.5. So anyone can use it who is using wp 3.5 or greater without activating xml-rpc via wordpress admin!

All of this can be done with below written 3 steps.
1. Writing XML Client Class
2. Using XML Client
3. Defining XML Server methods in wp functions.php

Note: Here all the things are not well documented, Because I am assuming you are enough expert on wp and did some google and finally here to see a code example of wp xml rpc implementations.
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I know you can not add products on your creloaded Cart! It is always trying to keep itself neat and clean that is EMPTY! 🙂

Solution!
The Empty Cart error on Creloaded is all about COOKIE save path or COOKIE storage domain!
So, The Empty Cart error on Creloaded Solution can be Some settings on configure.php file

For localhost setup:

define('HTTP_COOKIE_DOMAIN', 'localhost');

or

define('HTTP_COOKIE_DOMAIN', '');

with

define('STORE_SESSIONS', 'mysql'); 

For server setup:

define('HTTP_COOKIE_DOMAIN', 'yourdomain.com');

with

define('STORE_SESSIONS', 'mysql');