This plugin implements PENS in Chamilo, using the library php-pens available here: http://github.com/guillaumev/php-pens
You need the curl extension installed to use this library.
Install the plugin and create a file at the root of your chamilo server called pens.php. Put the following code in the pens.php file you created:
require_once __DIR__ . '/plugin/pens/pens.php';
The chamilo-pens plugin is published under the GNU/GPLv3+ licence (see COPYING)
The original author of the plugin is Guillaume Viguier-Just guillaume@viguierjust.com.
This plugin was realized as part of his work in BeezNest (https://beeznest.com) and is maintained by BeezNest.