關於微信和支付寶自動退款介面的接入總結

一：支付寶的自動退款介面接入

支付寶官方api：https://doc.open.alipay.com/doc2/apiDetail.htm?spm=a219a.7629065.0.0.PlTwKb&apiId=759&docType=4

支付寶的自動退款按照官方文檔開發都非常明了，不做太多的累贅：

有一點不太清楚的地方是，在退款成功後沒有返回支付寶自己的退款單號

官方文檔截圖如下：

部分代碼如下：

public void orderPayRefund(OpsOrderRefundDetailModel refundDetailModel, String refundPrice) throws Exception{
String appId = DataRequest.resources.getProperty("ali.app.appId");
String publicKey = DataRequest.resources.getProperty("ali.public.key");
AlipayClient alipayClient = new DefaultAlipayClient(
"https://openapi.alipay.com/gateway.do",appId,PRIVATE_KEY,"json",
"utf-8",publicKey,AlipayConstants.SIGN_TYPE_RSA);
AlipayTradeRefundRequest request = new AlipayTradeRefundRequest;
request.setBizContent("{" +
" "out_trade_no":""+refundDetailModel.getOutTradeNo+""," +
" "refund_amount":"+refundPrice+"," +
" "refund_reason":"正常退款"," +
" "out_request_no":""+refundDetailModel.getId+""" +
" }");
AlipayTradeRefundResponse response = alipayClient.execute(request);
if(response.isSuccess){
dealRefundSuccess(refundDetailModel,refundPrice,response.getTradeNo);
} else {
logger.error(response.getMsg+"退款失敗");
throw new UserHintException(response.getMsg);
}
}

二：微信的自動退款介面接入

微信官方api：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_4

微信退款比較麻煩的是需要證書的雙向認證，並且有簽名演算法做簽名認證。

官方文檔截圖如下：

對於證書的使用以及簽名生成演算法可以在官方文檔中詳細去閱讀，部分代碼如下：

public void refundApp(OpsOrderRefundDetailModel refundDetailModel,String refundPrice) throws Exception{
// 1.證書的使用（這個證書使用可以在官方文檔證書使用裡面有官方demo）
KeyStore keyStore = KeyStore.getInstance("PKCS12");
InputStream instream = this.getClass.getResourceAsStream(DataRequest.resources.getProperty("weixin.app.cert"));
try {
keyStore.load(instream, DataRequest.resources.getProperty("weixin.app.mchId").toCharArray);
} catch (Exception e){
e.printStackTrace;
}finally {
instream.close;
}
// Trust own CA and all self-signed certs
SSLContext sslcontext = SSLContexts.custom.loadKeyMaterial(keyStore,DataRequest.resources.getProperty("weixin.app.mchId").toCharArray).build;
// Allow TLSv1 protocol only
SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
sslcontext,
new String[] { "TLSv1" },
null,
SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);
CloseableHttpClient httpclient = HttpClients.custom
.setSSLSocketFactory(sslsf)
.build;
//http請求創建
HttpPost httppost = new HttpPost("https://api.mch.weixin.qq.com/secapi/pay/refund");
UnifiedRefundRequest req = new UnifiedRefundRequest;
req.setAppid(DataRequest.resources.getProperty("weixin.app.appId"));
req.setMch_id(DataRequest.resources.getProperty("weixin.app.mchId"));
req.setOut_trade_no(refundDetailModel.getOutTradeNo);
req.setOut_refund_no(refundDetailModel.getId);
req.setTotal_fee(refundDetailModel.getOrderPayedPrice.multiply(new BigDecimal(100)).intValue);
req.setRefund_fee(new BigDecimal(refundPrice).multiply(new BigDecimal(100)).intValue);
req.setOp_user_id("admin");
// 這裡createXml 方法已經完成了簽名
String xml = req.createXml;
//
// wx2421b1c4370ec43b
// 10000100
// 6cefdb308e1e2e8aabd48cf79e546a02
// 10000100
// 1415701182
// 1415757673
// 1
// 1
// // FE56DD4AA85C0EECA82C35595A69E153
//
//上面注掉的就是createXml的結果 紅色的地方就是簽名
StringEntity entity = new StringEntity(xml, "UTF-8");
httppost.setEntity(entity);
//退款介面請求結果接受和處理
CloseableHttpResponse responseEntry = httpclient.execute(httppost);
HttpEntity resEntity = responseEntry.getEntity;
String returnObj = (resEntity == null) ? null : EntityUtils.toString(resEntity, Consts.UTF_8);
UnifiedOrderResponse resp = AbstractWxResponse.toBean(returnObj, UnifiedOrderResponse.class);
resp.toVerify;
if("SUCCESS".equals(resp.getResult_code)){
dealRefundSuccess(refundDetailModel,refundPrice,resp.getRefund_id);
}else{
logger.error(resp.getErr_code_des+"退款失敗");
throw new UserHintException(resp.getErr_code_des);
}
}

簡單的一個總結，希望能對大家有所幫助或者啟發，當然最直接的東西還是看官方文檔。

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