WeChat payment v 3.3.6, payment 3.3.6

Payment v 3.3.6, payment 3.3.6

Text description;

Prerequisites: Register and apply for a service number, and activate payment.

Parameters involved: AppId, AppSecret, original ID (automatic reply), mch_id (merchant ID), and Key (merchant Key: set by yourself .)

Unified Specifications:

• Requirements

• Unified encryption mode: MD5.

• Unified Signature generation method:
  • Input parameter ascii code by field nameSort from small to large, UseFormat of url key-value pairs(Key1 = value1 & key2 = value2...) concatenate the string(Note: parameters with null values do not participate in the signature). In the stringFinally, connect them.& Key = Key (merchant key)And then proceedMD5 Encryption.Convert string to uppercase.

Payment:

• Jsapi payment and native payment both need to call the unified payment interface (URL address: https://api.mch.weixin.qq.com/pay/unifiedorder)

• Jsapi payment

• • The openid parameter is required to call the unified payment interface of jsapi (obtained through Oath2.0 authorization ).
  • The return parameters of the unified payment interface must first verify the signature and then obtain the prepay_id.

  • Document. addEventListener ('weixinjsbridgeready', function onBridgeReady () {// jQuery ('# wxpay') paid by the public account '). click (function (e) {WeixinJSBridge. invoke ('getbrandwcpayrequest', {"appId": appId, // public account name, passed by the merchant "timeStamp": timeStamp, // timeStamp "nonceStr": nonceStr, // random string "package": package, // format: prepay_id = xxxx "signType": signType, // signature method: MD5 "paySign": paySign // signature: generate signature parameters appId, timeStamp, nonceStr, package, and sign Type and key are case sensitive. }, Function (res) {if (res. err_msg = "get_brand_wcpay_request: OK") {window. location. href = url; // The page displayed after successful payment} // else {// alert (res. err_code + res. err_desc + res. err_msg); //});}, false)

• • Note: The jsapi page clicks "pay" twice to generate two orders. You need to add a secondary click protection mechanism on the page's PAYMENT button.

• Native payment
  • REQUIRED for the product_id Parameter
  • Call the unified payment interface to obtain the code_url and generate a QR code image.

Payment callback y_url:

Obtain xml format parameters, verify the signature, and process the logic (The notification background calls back multiple times. First, check whether the callback has been processed.).

 

Code area:

• Generate the Sign public method:

• Public string CreateSign (Dictionary <string, string> collection) {// sort List <KeyValuePair <string, string> list = new List <KeyValuePair <string, string >>( collection); list. sort (delegate (KeyValuePair <string, string> pair1, KeyValuePair <string, string> pair2) {return pair1.Key. compareTo (pair2.Key) ;}); StringBuilder sb = new StringBuilder (); foreach (KeyValuePair <string, string> pair in list) {sb. append (pair. key); sb. append ("="); sb. append (pair. value); sb. append ("&");} string str = sb. append ("key = value "). toString (); string signValue = MD5 (str ). toUpper (); // md5 encryption and conversion to big write return signValue ;}

• Xml and Dictionary conversion methods:

• public string DictionaryToXml(Dictionary<string, string> collection){　　StringBuilder sb = new StringBuilder();　　sb.Append("<xml>");　　foreach (KeyValuePair<string, string> pair in collection)　　{　　　　sb.Append("<" + pair.Key + ">");　　　　sb.Append("<![CDATA[" + pair.Value + "]]>");　　　　sb.Append("</" + pair.Key + ">");　　}　　sb.Append("</xml>");　　return sb.ToString();}public Dictionary<string, string> XmlToDictionary(XmlDocument doc){　　Dictionary<string, string> collection = new Dictionary<string, string>();　　foreach (XmlElement element in doc.DocumentElement.ChildNodes)　　{　　　　string key = element.Name;　　　　string value = element.InnerText;　　　　if (value != "")　　　　{　　　　　　collection.Add(key, value);　　　　}　　}　　return collection;}

• Obtain a Json key value:

• Public string GetJosnValue (string jsonStr, string key) {string result = string. Empty; if (! String. isNullOrEmpty (jsonStr) {key = "\" "+ key. trim ('"') +" \ ""; int index = jsonStr. indexOf (key) + key. length + 1; if (index> key. length + 1) {// cut the comma first. If it is the last one, cut the "}" and take the minimum value int end = jsonStr. indexOf (',', index); if (end =-1) {end = jsonStr. indexOf ('}', index);} // index = json. indexOf ('"', index + key. length + 1) + 1; result = jsonStr. substring (index, end-index); // filter quotation marks or spaces. result = result. trim (new char [] {'"','', '\ ''}) ;}} return result ;}