@RequestMapping("/refund/{no}")
    public void testTradeRefund(@PathVariable String no) throws Exception {
        AlipayClient client = new DefaultAlipayClient(AlipayConfig.URL, AlipayConfig.APPID, AlipayConfig.RSA_PRIVATE_KEY, AlipayConfig.FORMAT, AlipayConfig.CHARSET, AlipayConfig.ALIPAY_PUBLIC_KEY,AlipayConfig.SIGNTYPE);
        AlipayTradeRefundModel model = new AlipayTradeRefundModel();
        model.setOutTradeNo(no); //与预授权转支付商户订单号相同，代表对该笔交易退款
        model.setRefundAmount("0.01");
        model.setRefundReason("预授权退款测试");
        model.setOutRequestNo("refund0000001");//标识一次退款请求，同一笔交易多次退款需要保证唯一，如部分退款则此参数必传。
        AlipayTradeRefundRequest request = new AlipayTradeRefundRequest();
        request.setBizModel(model);
        AlipayTradeRefundResponse response = client.execute(request);
        log.info("response: {}"+response.getBody());



//退款失败的"fund_change":"N"
//        {"alipay_trade_refund_response":{"code":"10000","msg":"Success","buyer_logon_id":"mqv***@sandbox.com","buyer_user_id":"2088102171383132","fund_change":"N","gmt_refund_pay":"2018-08-30 15:39:03","out_trade_no":"13c7b574-5f54-42da-8165-e9fc0602f74e","refund_fee":"0.01","send_back_fee":"0.00","trade_no":"2018083021001004130500297310"},"sign":"LgzBU1K7056OLY0AAvFAZBVcZuXXt7PTbZDms5nB5qieslSKiKbYc22Jw4As/GdCJJuH7NVEtBABRM9UBXtTJBCGGn7By/H+vZfkulv43E4ASHvLC8OjXiPrypUO4SDleBTB4WW5h3Vnwk8q/SJ+UXv0lb5xrib84Zspsbz//3rrhzqGJ2sr/40YZIoIuevq/OAmLAkbNuAyIiC4ZxkJijF+mD3PbITTdYs/5e4cVEwriZcdLWnptblucSUtjKwEZvwaAuXuB+CEbqaMEBnpPgye0yqvY9tNb6PmVxHX7sc8sL9rfgDjK09xIXMhU9tgh0R/cgPZsRXvSs/HjHiqlA=="}

//退款成功的"fund_change":"Y"
//        {"alipay_trade_refund_response":{"code":"10000","msg":"Success","buyer_logon_id":"mqv***@sandbox.com","buyer_user_id":"2088102171383132","fund_change":"Y","gmt_refund_pay":"2018-08-30 15:42:15","out_trade_no":"2936025a-73eb-4273-8b1c-dfa8d637ff70","refund_fee":"0.01","send_back_fee":"0.00","trade_no":"2018083021001004130500297311"},"sign":"Nr6WroDGtVfWVCvqSSY7Z2SPtV68UbN9eII9GSMIZ3D4xlMRd+NoEUPl8EB9h3z2T8rR7fUrjAAjfIfC5qamaW6LW9tGXI4d8GprgU0YGx+53ZqyXJIaz3LeSJ6+U7NsC3h62/jOmgow6qAqca/XHkjHXmDTeERC+D6nqJLY28E5EKbVZK2IvupCo4sJLih8nI6BS0H5IjVIsRztAjgosrqCHic32JUel4/uyouBfRGPp5pp+3fzbxdJ1yMbUeKjuipNFS9Bhdvdt3ngTJoOAF+o7vQn7DIsJZQn5zNNP3BCEeXZIiXEfF/yha2HBlAM/ush5yZBpjMhDLXYRGuJUQ=="}
    }
 

@Override
public AlipayTradeRefundResponse refund(AlipayTradeRefundModel model) throws AlipayApiException {
    AlipayTradeRefundRequest request = new AlipayTradeRefundRequest();
    request.setBizModel(model);
    request.setNotifyUrl(aliPayProperties.getNotifyUrl());
    request.setReturnUrl(aliPayProperties.getReturnUrl());
    return alipayClient.execute(request);

}
 

public PayRefundChain(AlipayClient alipayClient, AlipayTradeRefundModel alipayTradeRefundModel) {
    this.alipayClient = alipayClient;
    this.alipayTradeRefundModel = alipayTradeRefundModel;
}
 

public PayRefundParamChain(AlipayClient alipayClient, AlipayTradeRefundModel alipayTradeRefundModel) {
    this.alipayClient = alipayClient;
    this.alipayTradeRefundModel = alipayTradeRefundModel;
}
 

/**
 * 退款
 *
 * @param model
 * @return
 * @throws AlipayApiException
 */
AlipayTradeRefundResponse refund(AlipayTradeRefundModel model) throws AlipayApiException;