/**
 * Filters the returned comment type string.
 *
 * @param string $name 
 * @param string $type 
 * @return string The filtered value.
 */
function my_webmention_comment_string_callback( string $name, string $type ) {
    // Your code here.
    return $name;
}
add_filter( 'webmention_comment_string', 'my_webmention_comment_string_callback', 10, 2 );

apply_filters( 'webmention_comment_string', $name, $type )