Addon that will import products from an XML feed into CS-Cart

We require an addon that will import products from an XML feed into CS-Cart Multivendor. The addon has to run via cron every few hours (we will set this) to update prices and stock of the imported products. It must do the following: [login to view URL] products that are not already in database (See appendix bellow for requirements) [login to view URL] products that are already in database (See appendix bellow for requirements) [login to view URL] products that are in database but not in the XML [login to view URL] multiple XML feeds. One for each vendor. [login to view URL] XML file for errors before processing it. [login to view URL] vendors XML feed must import the products under his account in the multivendor eshop. [login to view URL] must run each import/update in serial mode, not all at the same time - parallel - in order to reduce server load. (eg. run for vendor1 when it finishes then run for vendor2 etc) [login to view URL] has to be developed in such way that will allow us to update the cs-cart installation [login to view URL] is MUST be developed using CS-Cart API ([login to view URL]) and not using direct database/file manipulation. [login to view URL] cron job must have a token that we will define(hardcoded) for security reasons (eg. [login to view URL]). If the token is wrong the script must not run. XML specifications The XML feeds will have the format described here [login to view URL] (we only need the Required attributes. If there are more at the feed the system must simply ignore them), you can see a live example here: [login to view URL] It must have a function (even hardcoded) that will allow us to specify which XML feed is for each vendor and also allow us to disable specific vendors. This can be in a config php file, with a simple array. There is no need for panel integration. Usage example We have 2 vendors at our multivendor eshop. Vendor 1: Name TEST, ID: 1 Vendor 2: Name TEST2, ID:2 and their XML feeds are at the urls: [login to view URL] & [login to view URL] We must be able to assign each vendor with his XML file. The imported products must be under each one's vendor account.