Configure Cleeng API for Joomla 2.5 website

Hello, For an online magazine recently developed on joomla 2.5 and using RS MEMBERSHIP subscription system, we need to change it in view to use in fact the perfect system for monetization of the website : [login to view URL] [login to view URL] plugin is not available for joomla 2.5 but developers of cleeng had set up an API (find all info at [login to view URL]) in view to developp the plugin for joomla. So, we are seeking a developer able to manage this project in a very attractive price and a very short time. In view to understand what we want to do with cleeng, you can see [login to view URL] the french online magazine [login to view URL] is already using the cleeng system in view to monetize its content. The main idea of the cleeng system is to block a part of articles to visitors in exchange of payments, and not blocking articles for SEO.