wpmem_securify example

/**
 * Here is a theoretical example where additional user
 * criteria based on a custom user field "extra_access"
 * is checked. If the field "extra_access" is not "1"
 * then an error message is returned.
 */
add_filter( 'wpmem_securify', 'my_securify_filter' );
function my_securify_filter( $content ) {
    
    // If the user is logged in and the content is blocked.
    if ( is_user_logged_in() && wpmem_is_blocked() ) {
    
        $user_id = get_current_user_id();
        
        $extra_access = get_user_meta( $user_id, 'extra_access', true );
        
        if ( 1 != $extra_access ) {
            return "You do not have extra access!";
        }
    }
    
    return $content;
}