mc-cms-namelessmc/modules/Core/classes/Avatars/CrafatarAvatarSource.php

<?php
/**
 * Crafatar avatar source class
 *
 * @package Modules\Core\Avatars
 * @author Aberdeener
 * @version 2.0.0-pr12
 * @license MIT
 */
class CrafatarAvatarSource extends AvatarSourceBase {

    public function __construct() {
        $this->_name = 'Crafatar';
        $this->_base_url = 'https://crafatar.com/';
        $this->_perspectives_map = [
            'face' => 'avatars',
            'head' => 'renders/head'
        ];
    }

    public function getUrlToFormat(string $perspective): string {
        return $this->_base_url . $this->getRelativePerspective($perspective) . '/{identifier}?size={size}&overlay';
    }
}