minongyun.com/vendor/overtrue/wechat/src/Kernel/Messages/Transfer.php

<?php

/*
 * This file is part of the overtrue/wechat.
 *
 * (c) overtrue <i@overtrue.me>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

namespace EasyWeChat\Kernel\Messages;

/**
 * Class Transfer.
 *
 * @property string $to
 * @property string $account
 */
class Transfer extends Message
{
    /**
     * Messages type.
     *
     * @var string
     */
    protected $type = 'transfer_customer_service';

    /**
     * Properties.
     *
     * @var array
     */
    protected $properties = [
        'account',
    ];

    /**
     * Transfer constructor.
     *
     * @param string|null $account
     */
    public function __construct(string $account = null)
    {
        parent::__construct(compact('account'));
    }

    public function toXmlArray()
    {
        return empty($this->get('account')) ? [] : [
            'TransInfo' => [
                'KfAccount' => $this->get('account'),
            ],
        ];
    }
}