diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 00000000..e574bd95
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,7 @@
+## v2.0.1 / 2021-07-21
+
+- 增加卡商网服务
+
+## v2.0.0 / 2021-07-20
+
+- 发布v2版本
diff --git a/kashangwl/kashangwl.go b/kashangwl/kashangwl.go
new file mode 100644
index 00000000..1b2e597d
--- /dev/null
+++ b/kashangwl/kashangwl.go
@@ -0,0 +1,72 @@
+package kashangwl
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/bitly/go-simplejson"
+	md52 "gopkg.in/dtapps/go-library.v2/md5"
+	params2 "gopkg.in/dtapps/go-library.v2/params"
+	string2 "gopkg.in/dtapps/go-library.v2/string"
+	"io/ioutil"
+	"net/http"
+	"sort"
+	"strings"
+	"time"
+)
+
+const api = "http://www.kashangwl.com/api/"
+
+// KaShangWl 每次请求需传入以下参数
+type KaShangWl struct {
+	customerId  int    // 商家编号
+	customerKey string // 商家密钥
+}
+
+// Send 发送 http://cha.kashangwl.com/api-doc/
+func (w *KaShangWl) Send(msg interface{}, url string) (*simplejson.Json, error) {
+	// 	当前时间戳（单位：秒）
+	timestamp := time.Now().UnixNano() / 1e6
+	// 处理数据
+	marshal, _ := json.Marshal(msg)
+	newJson, _ := simplejson.NewJson(marshal)
+	newJson.Set("customer_id", w.customerId)
+	newJson.Set("timestamp", timestamp)
+	signStr := sign(newJson, w.customerKey)
+	newJson.Set("sign", signStr)
+	j, e := newJson.MarshalJSON()
+	if e != nil {
+		return nil, e
+	}
+	resp, e := http.Post(api+url, "application/json", strings.NewReader(string(j)))
+	if e != nil {
+		return nil, e
+	}
+	defer resp.Body.Close()
+
+	body, _ := ioutil.ReadAll(resp.Body)
+	respJson, err := simplejson.NewJson(body)
+	if err != nil {
+		return nil, err
+	}
+	return respJson, nil
+}
+
+// md5(key + 参数1名称 + 参数1值 + 参数2名称 + 参数2值...) 加密源串应为{key}customer_id1192442order_id827669582783timestamp1626845767
+func sign(params *simplejson.Json, key string) string {
+	var dataParams string
+	// 参数按照参数名的字典升序排列
+	var keys []string
+	for k := range params.MustMap() {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	// 拼接
+	dataParams = fmt.Sprintf("%s%s", dataParams, key)
+	for _, k := range keys {
+		dataParams = fmt.Sprintf("%s%s%s", dataParams, k, params2.GetParamsString(params.Get(k)))
+	}
+	// MD5加密
+	md5Str := md52.GetMD5Encode(dataParams)
+	str := string2.ToLower(md5Str)
+	return str
+}
diff --git a/kashangwl/kashangwl_test.go b/kashangwl/kashangwl_test.go
new file mode 100644
index 00000000..7e5e5ae7
--- /dev/null
+++ b/kashangwl/kashangwl_test.go
@@ -0,0 +1,24 @@
+package kashangwl
+
+import (
+	"gopkg.in/dtapps/go-library.v2/kashangwl/message"
+	"gopkg.in/dtapps/go-library.v2/kashangwl/url"
+	"log"
+	"testing"
+)
+
+func TestName(t *testing.T) {
+	wl := KaShangWl{
+		customerId:  0000000,
+		customerKey: "xxx",
+	}
+	msg := message.Order{
+		OrderId: 827669582783,
+	}
+	send, err := wl.Send(msg, url.Order)
+	if err != nil {
+		log.Printf("错误：%v\n", err)
+		return
+	}
+	log.Printf("返回：%s\n", send)
+}
diff --git a/kashangwl/message/message.go b/kashangwl/message/message.go
new file mode 100644
index 00000000..f1b8c0f1
--- /dev/null
+++ b/kashangwl/message/message.go
@@ -0,0 +1,30 @@
+package message
+
+type Product struct {
+	ProductId int `json:"product_id"` //true 商品编号
+}
+
+// ProductRechargeParams 获取商品的充值参数。
+type ProductRechargeParams struct {
+	ProductId int `json:"product_id"` //true 商品编号
+}
+
+// Buy 购买商品（不支持购买选号类型的商品）
+type Buy struct {
+	ProductId                  int         `json:"product_id"`                    //true 商品编号
+	RechargeAccount            string      `json:"recharge_account"`              //false	充值账号
+	RechargeTemplateInputItems interface{} `json:"recharge_template_input_items"` //false	模板充值参数（[1]见下方说明）
+	Quantity                   int         `json:"quantity"`                      //true	购买数量
+	NotifyUrl                  string      `json:"notify_url"`                    //false	异步通知地址
+	OuterOrderId               string      `json:"outer_order_id"`                //false	外部订单号
+}
+
+// Order 获取单个订单信息
+type Order struct {
+	OrderId int64 `json:"order_id"` //true	订单号
+}
+
+// Customer 获取商家信息
+type Customer struct {
+	CustomerId int `json:"customer_id"` //true	商家编号
+}
diff --git a/kashangwl/url/url.go b/kashangwl/url/url.go
new file mode 100644
index 00000000..77be40c5
--- /dev/null
+++ b/kashangwl/url/url.go
@@ -0,0 +1,9 @@
+package url
+
+const (
+	Product               = "product"                 // 获取单个商品信息
+	ProductRechargeParams = "product/recharge-params" // 获取商品的充值参数
+	Buy                   = "buy"                     // 购买商品（不支持购买选号类型的商品）
+	Order                 = "order"                   // 获取单个订单信息
+	Customer              = "customer"                // 获取商家信息
+)
diff --git a/library/go.go b/library/go.go
index 2945f60e..b90040c3 100644
--- a/library/go.go
+++ b/library/go.go
@@ -1,5 +1,5 @@
 package library
 
 func Version() string {
-	return "2.0.0"
+	return "2.0.1"
 }
diff --git a/md5/md5.go b/md5/md5.go
index b8fd6e63..3013168a 100644
--- a/md5/md5.go
+++ b/md5/md5.go
@@ -18,3 +18,15 @@ func Md5ToUpper(str string) string {
 	cipherStr := h.Sum(nil)
 	return strings.ToUpper(hex.EncodeToString(cipherStr))
 }
+
+// GetMD5Encode 返回一个32位md5加密后的字符串
+func GetMD5Encode(data string) string {
+	h := md5.New()
+	h.Write([]byte(data))
+	return hex.EncodeToString(h.Sum(nil))
+}
+
+// Get16MD5Encode 返回一个16位md5加密后的字符串
+func Get16MD5Encode(data string) string {
+	return GetMD5Encode(data)[8:24]
+}
diff --git a/string/string.go b/string/string.go
index 36bb5d9d..714c7d2a 100644
--- a/string/string.go
+++ b/string/string.go
@@ -4,6 +4,7 @@ import (
 	"crypto/hmac"
 	"crypto/sha256"
 	"encoding/hex"
+	"strings"
 )
 
 func HmacSha256Hex(key, strToSign string) string {
@@ -11,3 +12,7 @@ func HmacSha256Hex(key, strToSign string) string {
 	hasher.Write([]byte(strToSign))
 	return hex.EncodeToString(hasher.Sum(nil))
 }
+
+func ToLower(str string) string {
+	return strings.ToLower(str)
+}