<?php
/*
 Plugin Name: Secure Store (WordPress HTTPS)
 Plugin URI: http://mvied.com/projects/wordpress-https/
 Description: Uses WordPress HTTPS to secure URL's containing 'store'.
 Author: Mike Ems
 Version: 1.0
 Author URI: http://mvied.com/
 */

function store_force_ssl( $force_ssl, $post_id ) {
    if ( strpos($_SERVER['REQUEST_URI'], 'store') !== false ) {
        $force_ssl = true;
    }
    return $force_ssl;
}

add_filter('force_ssl', 'store_force_ssl', 10, 2);