收发现金红包之退回篇

场景： 
将剩余的未领取的红包资金退回红包发送方。 

调用流程： 

需要注意的点： 
  1.商户系统调用红包退回接口alipay.fund.coupon.order.refund完成红包剩余资金的退回，这个是提供给商户用的接口层面的退款。此外，支付宝端提供超时自动退款能力，用于将剩余资金全部退回，自助签约默认超时退款时间为48小 时；支付宝自动退款能力也有异步通知，会通知到支付接口的异步通知地址。 
  2.异步通知示例: 

[url]https://www.merchant.com/receive_notify.htm?notify_type=trade_status_sync&notify_id=91722adff935e8cfa58b3aabf4dead6ibe&notify_time=2017-02-16[/url] 21:46:15&sign_type=RSA2&sign=WcO+t3D8Kg71dTlKwN7r9PzUOXeaBJwp8/FOuSxcuSkXsoVYxBpsAidprySCjHCjmaglNcjoKJQLJ28/Asl93joTW39FX6i07lXhnbPknezAlwmvPdnQuI01HZsZF9V1i6ggZjBiAd5lG8bZtTxZOJ87ub2i9GuJ3Nr/NUc9VeY=&auth_no=null&out_order_no=null&operation_id=null&out_request_no=null&operation_type=null&amount=null&status=null&gmt_create=null&gmt_trans=null&payer_logon_id=null&payer_user_id=null

3.out_request_no参数是商户本次资金操作的请求流水号 ，这里请不要使用和支付接口相同的参数值，同一商户每次不同的资金操作请求，商户请求流水号不要重复。   

代码示例： 

AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipay.com/gateway.do",AlipayConfig.app_id, AlipayConfig.merchant_private_key, "json","UTF-8", AlipayConfig.alipay_public_key,"RSA");
        AlipayFundCouponOrderRefundRequest request = new AlipayFundCouponOrderRefundRequest();
        request.setBizContent("{" +
        "\"auth_no\":\"2018022310002001400250708573\"," +
        "\"out_request_no\":\"20180222112830333\"," +
        "\"amount\":0.01," +
        "\"remark\":\"红包退款\"" +
        "}");
        AlipayFundCouponOrderRefundResponse response;
        try {
            response = alipayClient.execute(request);
              
            if(response.isSuccess()){
                System.out.println("调用成功"+response.getBody());
                } else {
                System.out.println("调用失败"+response.getBody());
                }
        } catch (AlipayApiException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally {
              
        }

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