admin/config/wiyhdraw.php

<?php
return [
    'balance' => [
        'title' => '余额',
        'type' => 'balance',
        'class' => '',
    ],
    'wechat' => [
        'title' => '微信',
        'type' => 'wechat',
        'class' => '',
    ],
    'alipay' => [
        'title' => '支付宝',
        'type' => 'alipay',
        'class' => '',
    ],

];