update

README.md

@@ -44,10 +44,11 @@
 * 电脑网站支付：client.AliPayTradePagePay()
 * APP支付：client.AliPayTradeAppPay()
 * 统一收单交易支付接口(当面付)：client.AliPayTradePay()
-* 统一收单交易创建接口：client.AliPayTradeCreate()
+* 统一收单交易创建接口(小程序支付)：client.AliPayTradeCreate()
 * 统一收单线下交易查询：client.AliPayTradeQuery()
 * 统一收单交易关闭接口：client.AliPayTradeClose()
 * 统一收单交易撤销接口：client.AliPayTradeCancel()
+* 统一收单交易退款接口：client.AliPayTradeRefund()
 
 ## 支付宝公共API
 
@@ -102,7 +103,7 @@ fmt.Println("SessionKey:", userIdRsp.SessionKey)
     * signType
     * paySign
 
-> 微信小程序支付官方文档[微信小程序支付API](https://developers.weixin.qq.com/miniprogram/dev/api/open-api/payment/wx.requestPayment.html)
+> 微信小程序支付官方文档：[微信小程序支付API](https://developers.weixin.qq.com/miniprogram/dev/api/open-api/payment/wx.requestPayment.html)
 ```go
 timeStamp := strconv.FormatInt(time.Now().Unix(), 10)
 packages := "prepay_id=" + wxRsp.PrepayId   //此处的 wxRsp.PrepayId ,统一下单成功后得到
@@ -127,7 +128,7 @@ fmt.Println("paySign：", paySign)
     * package 
     * signType
     * paySign
-> 微信内H5支付官方文档[微信内H5支付文档](https://pay.weixin.qq.com/wiki/doc/api/external/jsapi.php?chapter=7_7&index=6)
+> 微信内H5支付官方文档：[微信内H5支付文档](https://pay.weixin.qq.com/wiki/doc/api/external/jsapi.php?chapter=7_7&index=6)
 ```go
 timeStamp := strconv.FormatInt(time.Now().Unix(), 10)
 packages := "prepay_id=" + wxRsp.PrepayId   //此处的 wxRsp.PrepayId ,统一下单成功后得到
@@ -153,7 +154,7 @@ fmt.Println("paySign：", paySign)
     * package 
     * timestamp
     * sign
-> APP支付官方文档[APP端调起支付的参数列表文档](https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=9_12)
+> APP支付官方文档：[APP端调起支付的参数列表文档](https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=9_12)
 ```go
 timeStamp := strconv.FormatInt(time.Now().Unix(), 10)
 //注意：signType：此处签名方式，务必与统一下单时用的签名方式一致
@@ -173,7 +174,7 @@ fmt.Println("paySign：", paySign)
 
 ### 1、支付结果异步通知参数解析；2、参数解析和Sign值的验证
 
-> 微信支付后的异步通知文档[支付结果通知](https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=9_7&index=8)
+> 微信支付后的异步通知文档：[支付结果通知](https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=9_7&index=8)
 
 ```go
 //解析支付完成后的异步通知参数信息
@@ -199,9 +200,9 @@ log.Println("sign:", sign)
 
 > 拿小程序获取手机号为例
 
-button按钮获取手机号码:[button组件文档](https://developers.weixin.qq.com/miniprogram/dev/component/button.html)
+button按钮获取手机号码：[button组件文档](https://developers.weixin.qq.com/miniprogram/dev/component/button.html)
 
-微信解密算法文档:[解密算法文档](https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/signature.html)
+微信解密算法文档：[解密算法文档](https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/signature.html)
 ```go
 data := "Kf3TdPbzEmhWMuPKtlKxIWDkijhn402w1bxoHL4kLdcKr6jT1jNcIhvDJfjXmJcgDWLjmBiIGJ5acUuSvxLws3WgAkERmtTuiCG10CKLsJiR+AXVk7B2TUQzsq88YVilDz/YAN3647REE7glGmeBPfvUmdbfDzhL9BzvEiuRhABuCYyTMz4iaM8hFjbLB1caaeoOlykYAFMWC5pZi9P8uw=="
 iv := "Cds8j3VYoGvnTp1BrjXdJg=="
@@ -221,7 +222,7 @@ fmt.Println("Watermark:", phone.Watermark)
 
 ### 微信付款结果异步通知,需回复微信平台是否成功
 
-> 代码中return写法，由于本人用的[Echo Web框架](https://github.com/labstack/echo)，有兴趣的可以尝试一下
+> 代码中return写法，由于本人用的 [Echo Web框架](https://github.com/labstack/echo)，有兴趣的可以尝试一下
 
 ```go
 rsp := new(gopay.WeChatNotifyResponse) //回复微信的数据
@@ -358,7 +359,7 @@ fmt.Println("Response：", wxRsp)
 
 ### 换取授权访问令牌（得到access_token，user_id等信息）
 
-> 支付宝换取授权访问令牌文档[换取授权访问令牌](https://docs.open.alipay.com/api_9/alipay.system.oauth.token)
+> 支付宝换取授权访问令牌文档：[换取授权访问令牌](https://docs.open.alipay.com/api_9/alipay.system.oauth.token)
 
 ```go
 privateKey := "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"
@@ -379,9 +380,9 @@ fmt.Println("rsp:", *rsp)
 
 > 拿小程序获取手机号为例
 
-获取用户手机号文档:[获取用户手机号](https://docs.alipay.com/mini/api/getphonenumber)
+获取用户手机号文档：[获取用户手机号](https://docs.alipay.com/mini/api/getphonenumber)
 
-敏感信息加解密官方文档:[敏感信息加解密方法](https://docs.alipay.com/mini/introduce/aes)
+敏感信息加解密官方文档：[敏感信息加解密方法](https://docs.alipay.com/mini/introduce/aes)
 ```go
 data := "MkvuiIZsGOC8S038cu/JIpoRKnF+ZFjoIRGf5d/K4+ctYjCtb/eEkwgrdB5TeH/93bxff1Ylb+SE+UGStlpvcg=="
 key := "TDftre9FpItr46e9BVNJcw=="
@@ -400,7 +401,7 @@ fmt.Println("rsp.Mobile:", rsp.Mobile)
 
 ### 1、支付结果异步通知参数解析；2、验签操作
 
-> 支付宝支付后的异步通知验签文档[支付结果通知](https://docs.open.alipay.com/200/106120)
+> 支付宝支付后的异步通知验签文档：[支付结果通知](https://docs.open.alipay.com/200/106120)
 
 ```go
 //解析支付完成后的异步通知参数信息
@@ -430,7 +431,7 @@ fmt.Println("ok:", ok)
 
 * 程序执行完后必须打印输出“success”（不包含引号）。如果商户反馈给支付宝的字符不是success这7个字符，支付宝服务器会不断重发通知，直到超过24小时22分钟。一般情况下，25小时以内完成8次通知（通知的间隔频率一般是：4m,10m,10m,1h,2h,6h,15h）
 
-> 代码中return写法，由于本人用的[Echo Web框架](https://github.com/labstack/echo)，有兴趣的可以尝试一下
+> 代码中return写法，由于本人用的 [Echo Web框架](https://github.com/labstack/echo)，有兴趣的可以尝试一下
 
 ```go
 return c.String(http.StatusOK, "success")
@@ -440,9 +441,9 @@ return c.String(http.StatusOK, "success")
 
 * 手机网站支付是通过服务端获取支付URL后，然后返回给客户端，请求URL地址即可打开支付页面
 
-> 文档说明[手机网站支付-请求参数说明](https://docs.open.alipay.com/203/107090/) 
+> 文档说明：[手机网站支付-请求参数说明](https://docs.open.alipay.com/203/107090/) 
 
-> 文档说明[手机网站支付接口2.0](https://docs.open.alipay.com/api_1/alipay.trade.wap.pay/) 
+> 文档说明：[手机网站支付接口2.0](https://docs.open.alipay.com/api_1/alipay.trade.wap.pay/) 
 
 ```go
 privateKey := "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"
@@ -477,9 +478,9 @@ fmt.Println("payUrl:", payUrl)
 
 * APP支付是通过服务端获取支付参数后，然后通过Android/iOS客户端的SDK调用支付功能
 
-> 文档说明[APP支付-请求参数说明](https://docs.open.alipay.com/204/105465/) 
+> 文档说明：[APP支付-请求参数说明](https://docs.open.alipay.com/204/105465/) 
 
-> 文档说明[APP支付接口2.0](https://docs.open.alipay.com/api_1/alipay.trade.app.pay/) 
+> 文档说明：[APP支付接口2.0](https://docs.open.alipay.com/api_1/alipay.trade.app.pay/) 
 
 ```go
 privateKey := "MIIEogIBAAKCAQEAy+CRzKw4krA2RzCDTqg5KJg92XkOY0RN3pW4sYInPqnGtHV7YDHu5nMuxY6un+dLfo91OFOEg+RI+WTOPoM4xJtsOaJwQ1lpjycoeLq1OyetGW5Q8wO+iLWJASaMQM/t/aXR/JHaguycJyqlHSlxANvKKs/tOHx9AhW3LqumaCwz71CDF/+70scYuZG/7wxSjmrbRBswxd1Sz9KHdcdjqT8pmieyPqnM24EKBexHDmQ0ySXvLJJy6eu1dJsPIz+ivX6HEfDXmSmJ71AZVqZyCI1MhK813R5E7XCv5NOtskTe3y8uiIhgGpZSdB77DOyPLcmVayzFVLAQ3AOBDmsY6wIDAQABAoIBAHjsNq31zAw9FcR9orQJlPVd7vlJEt6Pybvmg8hNESfanO+16rpwg2kOEkS8zxgqoJ1tSzJgXu23fgzl3Go5fHcoVDWPAhUAOFre9+M7onh2nPXDd6Hbq6v8OEmFapSaf2b9biHnBHq5Chk08v/r74l501w3PVVOiPqulJrK1oVb+0/YmCvVFpGatBcNaefKUEcA+vekWPL7Yl46k6XeUvRfTwomCD6jpYLUhsAKqZiQJhMGoaLglZvkokQMF/4G78K7FbbVLMM1+JDh8zJ/DDVdY2vHREUcCGhl4mCVQtkzIbpxG++vFg7/g/fDI+PquG22hFILTDdtt2g2fV/4wmkCgYEA6goRQYSiM03y8Tt/M4u1Mm7OWYCksqAsU7rzQllHekIN3WjD41Xrjv6uklsX3sTG1syo7Jr9PGE1xQgjDEIyO8h/3lDQyLyycYnyUPGNNMX8ZjmGwcM51DQ/QfIrY/CXjnnW+MVpmNclAva3L33KXCWjw20VsROV1EA8LCL94BUCgYEA3wH4ANpzo7NqXf+2WlPPMuyRrF0QPIRGlFBNtaKFy0mvoclkREPmK7+N4NIGtMf5JNODS5HkFRgmU4YNdupA2I8lIYpD+TsIobZxGUKUkYzRZYZ1m1ttL69YYvCVz9Xosw/VoQ+RrW0scS5yUKqFMIUOV2R/Imi//c5TdKx6VP8CgYAnJ1ADugC4vI2sNdvt7618pnT3HEJxb8J6r4gKzYzbszlGlURQQAuMfKcP7RVtO1ZYkRyhmLxM4aZxNA9I+boVrlFWDAchzg+8VuunBwIslgLHx0/4EoUWLzd1/OGtco6oU1HXhI9J9pRGjqfO1iiIifN/ujwqx7AFNknayG/YkQKBgD6yNgA/ak12rovYzXKdp14Axn+39k2dPp6J6R8MnyLlB3yruwW6NSbNhtzTD1GZ+wCQepQvYvlPPc8zm+t3tl1r+Rtx3ORf5XBZc3iPkGdPOLubTssrrAnA+U9vph61W+OjqwLJ9sHUNK9pSHhHSIS4k6ycM2YAHyIC9NGTgB0PAoGAJjwd1DgMaQldtWnuXjvohPOo8cQudxXYcs6zVRbx6vtjKe2v7e+eK1SSVrR5qFV9AqxDfGwq8THenRa0LC3vNNplqostuehLhkWCKE7Y75vXMR7N6KU1kdoVWgN4BhXSwuRxmHMQfSY7q3HG3rDGz7mzXo1FVMr/uE4iDGm0IXY="
@@ -512,9 +513,9 @@ fmt.Println("payParam:", payParam)
 
 * 电脑网站支付是通过服务端获取支付URL后，然后返回给客户端，请求URL地址即可打开支付页面
 
-> 文档说明[电脑网站支付](https://docs.open.alipay.com/270) 
+> 文档说明：[电脑网站支付](https://docs.open.alipay.com/270) 
 
-> 文档说明[统一收单下单并支付页面接口](https://docs.open.alipay.com/api_1/alipay.trade.page.pay) 
+> 文档说明：[统一收单下单并支付页面接口](https://docs.open.alipay.com/api_1/alipay.trade.page.pay) 
 
 ```go
 privateKey := "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"
@@ -549,9 +550,9 @@ fmt.Println("payUrl:", payUrl)
 
 * 商家使用扫码枪等条码识别设备扫描用户支付宝钱包上的条码/二维码，完成收款。
 
-> 文档说明[当面付-条码支付](https://docs.open.alipay.com/194) 
+> 文档说明：[当面付-条码支付](https://docs.open.alipay.com/194) 
 
-> 文档说明[统一收单交易支付接口](https://docs.open.alipay.com/api_1/alipay.trade.pay) 
+> 文档说明：[统一收单交易支付接口](https://docs.open.alipay.com/api_1/alipay.trade.pay) 
 
 ```go
 privateKey := "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"
@@ -583,6 +584,37 @@ if err != nil {
 }
 fmt.Println("aliRsp:", *aliRsp)
 ```
+
+### 统一收单交易退款接口
+
+* 交易订单退款接口，具体条件请看官方文档介绍
+
+> 文档说明：[统一收单交易退款接口](https://docs.open.alipay.com/api_1/alipay.trade.refund) 
+
+```go
+privateKey := "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"
+//初始化支付宝客户端
+//    appId：应用ID
+//    privateKey：应用秘钥
+//    isProd：是否是正式环境
+client := NewAliPayClient("2016091200494382", privateKey, false)
+//配置公共参数
+client.SetCharset("utf-8").
+	SetSignType("RSA2")
+//请求参数
+body := make(BodyMap)
+body.Set("out_trade_no", "GZ201907261437329516")
+body.Set("refund_amount", "100.00")
+body.Set("refund_reason", "测试支付退款")
+//发起退款请求
+aliRsp, err := client.AliPayTradeRefund(body)
+if err != nil {
+	fmt.Println("err:", err)
+	return
+}
+fmt.Println("aliRsp:", *aliRsp)
+```
+
 ## License
 ```
 Copyright 2019 Jerry