new_sdk_wu/www/new_sdk/application/common/contracts/PayInterface.php

<?php

namespace app\common\contracts;

interface PayInterface
{
    // 下单
    public function pay($data, $type);

    // 查询订单
    public function query($data);

    // 退款
    public function refund($data);

    // 支付回调
    public function notify($data);
}