Customize user login behavior with hook – approve/deny access based on custom rules (default: true allows login). Enforce security, restrictions, or conditional access.

<?php
function my_component_init(){
		ossn_add_hook('user', 'login', 'my_component_hook');
}
function my_component_hook($hook, $type, $return, $params){
		//$params['user'] contain the user instance
		if($params['user']->username === 'abcdef'){
			return false;
		}
		return truel
}
ossn_register_callback('ossn', 'init', 'my_component_init');

This example will check if username is abcdef then don't allow login otherwise if any other username allow login.