diff --git a/wechat_export.go b/wechat_servier_api.go
similarity index 58%
rename from wechat_export.go
rename to wechat_servier_api.go
index abe2a084..cec962d2 100644
--- a/wechat_export.go
+++ b/wechat_servier_api.go
@@ -12,11 +12,16 @@ import (
 	"crypto/sha256"
 	"crypto/tls"
 	"encoding/hex"
-	"fmt"
 	"github.com/parnurzeal/gorequest"
 	"strings"
 )
 
+func HttpAgent() (agent *gorequest.SuperAgent) {
+	agent = gorequest.New()
+	agent.TLSClientConfig(&tls.Config{InsecureSkipVerify: true})
+	return
+}
+
 //JSAPI支付，支付参数后，再次计算出小程序用的paySign
 func GetMiniPaySign(appId, nonceStr, prepayId, signType, timeStamp, secretKey string) (paySign string) {
 	buffer := new(bytes.Buffer)
@@ -92,20 +97,50 @@ func GetH5PaySign(appId, nonceStr, prepayId, signType, timeStamp, secretKey stri
 }
 
 //获取微信用户的OpenId、SessionKey、UnionId
-func GetWeChatUserId(appId, secretKey, wxCode string) (userRsp *WeChatUserIdRsp, err error) {
-	userRsp = new(WeChatUserIdRsp)
+//    appId:APPID
+//    appSecret:AppSecret
+//    wxCode:小程序调用wx.login 获取的code
+func Code2Session(appId, appSecret, wxCode string) (userRsp *Code2SessionRsp, err error) {
+	userRsp = new(Code2SessionRsp)
+	url := "https://api.weixin.qq.com/sns/jscode2session?appid=" + appId + "&secret=" + appSecret + "&js_code=" + wxCode + "&grant_type=authorization_code"
+	agent := HttpAgent()
+	_, _, errs := agent.Get(url).EndStruct(userRsp)
+	if len(errs) > 0 {
+		return nil, errs[0]
+	} else {
+		return userRsp, nil
+	}
+}
 
-	url := fmt.Sprintf("https://api.weixin.qq.com/sns/jscode2session?appid=%v&secret=%v&js_code=%v&grant_type=authorization_code", appId, secretKey, wxCode)
+//获取小程序全局唯一后台接口调用凭据(AccessToken:157字符)
+//    appId:APPID
+//    appSecret:AppSecret
+func GetAccessToken(appId, appSecret string) (rsp *GetAccessTokenRsp, err error) {
+	rsp = new(GetAccessTokenRsp)
+	url := "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appId + "&secret=" + appSecret
 
-	agent := gorequest.New()
-	tlsCfg := &tls.Config{
-		InsecureSkipVerify: true,
+	agent := HttpAgent()
+	_, _, errs := agent.Get(url).EndStruct(rsp)
+	if len(errs) > 0 {
+		return nil, errs[0]
+	} else {
+		return rsp, nil
 	}
-	agent.TLSClientConfig(tlsCfg)
-	_, _, errs := agent.Get(url).EndStruct(userRsp)
+}
+
+//用户支付完成后，获取该用户的 UnionId，无需用户授权。
+//    accessToken：接口调用凭据
+//    openId：用户的OpenID
+//    transactionId：微信支付订单号
+func GetPaidUnionId(accessToken, openId, transactionId string) (rsp *GetPaidUnionIdRsp, err error) {
+	rsp = new(GetPaidUnionIdRsp)
+	url := "https://api.weixin.qq.com/wxa/getpaidunionid?access_token=" + accessToken + "&openid=" + openId + "&transaction_id=" + transactionId
+
+	agent := HttpAgent()
+	_, _, errs := agent.Get(url).EndStruct(rsp)
 	if len(errs) > 0 {
 		return nil, errs[0]
 	} else {
-		return userRsp, nil
+		return rsp, nil
 	}
 }