This time I will bring you the development of the refund function of WeChat payment. What are the precautions for the development of the refund function of WeChat payment. The following is a practical case, let's take a look.

Let’s first complain about WeChat’s documentation and demo. The important step information is not emphasized clearly, and the .net demo has never been successfully run.

1. Scan the WeChat QR code to log in

2. WeChat PC payment

It took several attempts to get through this refund function. The following introduces the development steps of the WeChat payment refund function:

1. Download the certificate and import it into the system

WeChat refund requires a certificate. This certificate is not the certificate in the official demo, but You need to download the certificate from the api security column in the WeChat merchant platform. In a word document of the official certificate usage example, you can see the following words: C# There is one thing to note, in addition to using ## in the code In addition to #apiclient_cert.p12, the certificate also needs to be imported into the operating system before it can be used. 1. Used in the code; 2. Imported into the operating system, both of which are indispensable. .NET version needs to be greater than 2.0 I didn’t know these two steps before and wasted too much time. So download the certificate first:

# When downloading, you need mobile phone verification and login password. After downloading, find the certificate

apiclient_cert.p12 and double-click to import it. When importing, you will be prompted to enter a password. This password is the merchant ID, and it must be the certificate downloaded on your own merchant platform. Otherwise, a password error prompt will appear:

Import the correct prompt:

2. Code Refund

You can directly use the code in the official demo here. To download the demo, you need to modify several parameters in WxPayConfig:

?　　　??public?const?string?APPID?=?"wxf6dd794bcexxxx";????????public?const?string?MCHID?=?"xxxx";????????public?const?string?KEY?=?"xxxxx849ba56abbe56e05xxxxx";????????public?const?string?APPSECRET?=?"---";????????//=======【證書路徑設(shè)置】=====================================?
????????/*?證書路徑,注意應(yīng)該填寫絕對路徑（僅退款、撤銷訂單時需要）????????*/
????????public?const?string?SSLCERT_PATH?=?"/WxPayAPI/cert/apiclient_cert.p12";????????public?const?string?SSLCERT_PASSWORD?=?"131xxxx";

The SSLCERT_PASSWORD above is MCHID, which is the merchant ID. SSLCERT_PASSWORD error will prompt that the specified network password is incorrect:

Next, add a refund method in controller

, including the WeChat order number , merchant order number, total amount and refund amount. Choose one of the merchant order number and WeChat order number. Detailed parameters

??public?ActionResult?DoRefund()
????????{????????????string?result?=?Refund.Run("","131667780120trade_no",?"1",?"1");????????????return?Content(result);
????????}

Run method of Refund class:

?/***
????????*?申請退款完整業(yè)務(wù)流程邏輯
????????*?@param?transaction_id?微信訂單號（優(yōu)先使用）
????????*?@param?out_trade_no?商戶訂單號
????????*?@param?total_fee?訂單總金額
????????*?@param?refund_fee?退款金額
????????*?@return?退款結(jié)果（xml格式）????????*/
????????public?static?string?Run(string?transaction_id,?string?out_trade_no,?string?total_fee,?string?refund_fee)
????????{
????????????Logger.Info("Refund?is?processing...");
????????????WxPayData?data?=?new?WxPayData();????????????if?(!string.IsNullOrEmpty(transaction_id))//微信訂單號存在的條件下，則已微信訂單號為準(zhǔn)????????????{
????????????????data.SetValue("transaction_id",?transaction_id);
????????????}????????????else//微信訂單號不存在，才根據(jù)商戶訂單號去退款????????????{
????????????????data.SetValue("out_trade_no",?out_trade_no);
????????????}
????????????data.SetValue("total_fee",?int.Parse(total_fee));//訂單總金額
????????????data.SetValue("refund_fee",?int.Parse(refund_fee));//退款金額
????????????data.SetValue("out_refund_no",?out_trade_no);//隨機生成商戶退款單號
????????????data.SetValue("op_user_id",?WxPayConfig.MCHID);//操作員，默認(rèn)為商戶號
????????????WxPayData?result?=?WxPayApi.Refund(data);//提交退款申請給API，接收返回數(shù)據(jù)
????????????Logger.Info("Refund?process?complete,?result?:?"?+?result.ToXml());????????????return?result.ToPrintStr();
????????}

Refund: Method

?/**
????????*?
????????*?申請退款
????????*?@param?WxPayData?inputObj?提交給申請退款A(yù)PI的參數(shù)
????????*?@param?int?timeOut?超時時間
????????*?@throws?WxPayException
????????*?@return?成功時返回接口調(diào)用結(jié)果，其他拋異常????????*/
????????public?static?WxPayData?Refund(WxPayData?inputObj,?int?timeOut?=?6)
????????{????????????string?url?=?"https://api.mch.weixin.qq.com/secapi/pay/refund";????????????//檢測必填參數(shù)
????????????if?(!inputObj.IsSet("out_trade_no")?&&?!inputObj.IsSet("transaction_id"))
????????????{????????????????throw?new?WxPayException("退款申請接口中，out_trade_no、transaction_id至少填一個！");
????????????}????????????else?if?(!inputObj.IsSet("out_refund_no"))
????????????{????????????????throw?new?WxPayException("退款申請接口中，缺少必填參數(shù)out_refund_no！");
????????????}????????????else?if?(!inputObj.IsSet("total_fee"))
????????????{????????????????throw?new?WxPayException("退款申請接口中，缺少必填參數(shù)total_fee！");
????????????}????????????else?if?(!inputObj.IsSet("refund_fee"))
????????????{????????????????throw?new?WxPayException("退款申請接口中，缺少必填參數(shù)refund_fee！");
????????????}????????????else?if?(!inputObj.IsSet("op_user_id"))
????????????{????????????????throw?new?WxPayException("退款申請接口中，缺少必填參數(shù)op_user_id！");
????????????}
????????????inputObj.SetValue("appid",?WxPayConfig.APPID);//公眾賬號ID
????????????inputObj.SetValue("mch_id",?WxPayConfig.MCHID);//商戶號
????????????inputObj.SetValue("nonce_str",?Guid.NewGuid().ToString().Replace("-",?""));//隨機字符串
????????????inputObj.SetValue("sign",?inputObj.MakeSign());//簽名
????????????
????????????string?xml?=?inputObj.ToXml();????????????var?start?=?DateTime.Now;
????????????Log.Debug("WxPayApi",?"Refund?request?:?"?+?xml);????????????string?response?=?HttpService.Post(xml,?url,?true,?timeOut);//調(diào)用HTTP通信接口提交數(shù)據(jù)到API
????????????Log.Debug("WxPayApi",?"Refund?response?:?"?+?response);????????????var?end?=?DateTime.Now;????????????int?timeCost?=?(int)((end?-?start).TotalMilliseconds);//獲得接口耗時????????????//將xml格式的結(jié)果轉(zhuǎn)換為對象以返回
????????????WxPayData?result?=?new?WxPayData();
????????????result.FromXml(response);
????????????ReportCostTime(url,?timeCost,?result);//測速上報
????????????return?result;
????????}

Remember to modify it to your own parameters in the production environment. If the parameters are correct, it will return:

Moreover, WeChat will immediately receive a refund notification:

Summary : At this point, the refund function has been implemented. In fact, if the parameters and process are correct, this place is still very simple. WeChat’s regulations allow you to apply for refunds for transactions within one year.

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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The above is the detailed content of Development of refund function for WeChat Pay. For more information, please follow other related articles on the PHP Chinese website!