Meta Box

After some exploration, I noticed that user_id attribute is not listed in shortcode_atts in MB_User_Profile_Shortcode_Info class. If I add 'user_id' => '' to $args array, and modify $meta_box->set_object_id( get_current_user_id() ); to $meta_box->set_object_id( !empty($args['user_id']) ? $args['user_id'] : get_current_user_id() ); I can retrieve data from specified user_id. However, form is still submitted for current_user, not specified user.

custom fields code:

add_filter( 'rwmb_meta_boxes', 'your_prefix_register_meta_boxes' );
function your_prefix_register_meta_boxes( $meta_boxes ) {
    $meta_boxes[] = array (
        'title' => 'User Data',
        'id' => 'user-data',
        'fields' => array(
            array (
                'id' => 'user_credits',
                'type' => 'number',
                'name' => 'Credits',
            ),
        ),
        'table' => 'prefix_users_data',
        'type' => 'user',
        'storage_type' => 'custom_table',
    );
    return $meta_boxes;
}