diff --git a/utils/auth.go b/utils/auth.go
index d025161..bd10ce6 100644
--- a/utils/auth.go
+++ b/utils/auth.go
@@ -1,6 +1,8 @@
 package utils
 
 import (
+	"strings"
+
 	"domain0/config"
 	"encoding/json"
 	"errors"
@@ -16,6 +18,7 @@ type AccessTokenInfo struct {
 	ExpiresIn        int    `json:"expires_in"`
 	RefreshToken     string `json:"refresh_token"`
 	RefreshExpiresIn int    `json:"refresh_expires_in"`
+	Scope            string `json:"scope"`
 }
 
 type AuthInfo struct {
@@ -36,24 +39,41 @@ type AuthInfo struct {
 	// Mobile       string `json:"mobile"`
 }
 
-type FeishuAuthInfoResponse struct {
-	Code    int      `json:"code"`
-	Message string   `json:"msg"`
-	Data    AuthInfo `json:"data"`
+// enterprise email
+var AuthScope = strings.Join([]string{"mail:user_mailbox:readonly"}, " ")
+
+type FeishuGenericResponse[T any] struct {
+	Code    int    `json:"code"`
+	Message string `json:"msg"`
+	Data    T      `json:"data"`
+}
+
+type FeishuAccessTokenInfoResponse = FeishuGenericResponse[AccessTokenInfo]
+
+type FeishuAuthInfoResponse = FeishuGenericResponse[AuthInfo]
+
+type FeishuAppAccessTokenInfoResponse struct {
+	AppAccessToken    string `json:"app_access_token"`
+	Code              int    `json:"code"`
+	Expire            int    `json:"expire"`
+	Msg               string `json:"msg"`
+	TenantAccessToken string `json:"tenant_access_token"`
 }
 
 func FeishuRedirectToCodeURL() string {
-	return "https://passport.feishu.cn/suite/passport/oauth/authorize?client_id=" + config.CONFIG.Feishu.AppID +
+	return "https://open.feishu.cn/open-apis/authen/v1/authorize?app_id=" + config.CONFIG.Feishu.AppID +
 		"&redirect_uri=" + url.QueryEscape(config.CONFIG.Feishu.RedirectURL) +
-		"&response_type=code" +
+		"&scope=" + url.QueryEscape(AuthScope) +
 		"&state=feishu"
 }
 
+func feishuAppAccessTokenURL() string {
+	return "https://open.feishu.cn/open-apis/auth/v3/app_access_token/internal?app_id=" + config.CONFIG.Feishu.AppID +
+		"&app_secret=" + config.CONFIG.Feishu.AppSecret
+}
+
 func feishuRedirectToTokenURL(code string) string {
-	return "https://passport.feishu.cn/suite/passport/oauth/token?grant_type=authorization_code&client_id=" + config.CONFIG.Feishu.AppID +
-		"&client_secret=" + config.CONFIG.Feishu.AppSecret +
-		"&code=" + code +
-		"&redirect_uri=" + url.QueryEscape(config.CONFIG.Feishu.RedirectURL)
+	return "https://open.feishu.cn/open-apis/authen/v1/oidc/access_token?grant_type=authorization_code&code=" + code
 }
 
 func feishuGetUserInfoURL() string {
@@ -61,6 +81,35 @@ func feishuGetUserInfoURL() string {
 }
 
 func FeishuGetUserInfo(code string) (AuthInfo, error) {
+	// Query App access token
+	t := fiber.AcquireAgent()
+	defer fiber.ReleaseAgent(t)
+
+	app_req := t.Request()
+	app_req.Header.SetMethod("POST")
+	app_req.SetRequestURI(feishuAppAccessTokenURL())
+	if err := t.Parse(); err != nil {
+		logrus.Error(err)
+		return AuthInfo{}, err
+	}
+
+	hcode, body, errs := t.Bytes()
+	if len(errs) != 0 || hcode != 200 {
+		logrus.Error("fetch app token failed : ", string(body), errs)
+		return AuthInfo{}, errors.New("feishu auth failed")
+	}
+
+	var feishuAppAccessTokenInfo FeishuAppAccessTokenInfoResponse
+	err := json.Unmarshal(body, &feishuAppAccessTokenInfo)
+	if err != nil {
+		logrus.Error(err)
+		return AuthInfo{}, err
+	}
+	if feishuAppAccessTokenInfo.Code != 0 {
+		logrus.Error("fetch app token failed : ", feishuAppAccessTokenInfo.Msg)
+		return AuthInfo{}, errors.New("feishu auth failed")
+	}
+
 	// Query Access token
 	a := fiber.AcquireAgent()
 	defer fiber.ReleaseAgent(a)
@@ -68,24 +117,28 @@ func FeishuGetUserInfo(code string) (AuthInfo, error) {
 	act_req := a.Request()
 	act_req.Header.SetMethod("POST")
 	act_req.SetRequestURI(feishuRedirectToTokenURL(code))
-
+	act_req.Header.Set("Authorization", "Bearer "+feishuAppAccessTokenInfo.AppAccessToken)
 	if err := a.Parse(); err != nil {
 		logrus.Error(err)
 		return AuthInfo{}, err
 	}
 
-	hcode, body, errs := a.Bytes()
+	hcode, body, errs = a.Bytes()
 	if len(errs) != 0 || hcode != 200 {
-		logrus.Error(errs)
+		logrus.Error("fetch auth token failed : ", string(body), errs)
 		return AuthInfo{}, errors.New("feishu auth failed")
 	}
 
-	var accessTokenInfo AccessTokenInfo
-	err := json.Unmarshal(body, &accessTokenInfo)
+	var accessTokenInfo FeishuAccessTokenInfoResponse
+	err = json.Unmarshal(body, &accessTokenInfo)
 	if err != nil {
 		logrus.Error(err)
 		return AuthInfo{}, err
 	}
+	if accessTokenInfo.Code != 0 {
+		logrus.Error("fetch user info failed : ", accessTokenInfo.Message)
+		return AuthInfo{}, errors.New("feishu auth failed")
+	}
 
 	// Query User info
 	u := fiber.AcquireAgent()
@@ -94,10 +147,10 @@ func FeishuGetUserInfo(code string) (AuthInfo, error) {
 	user_req := u.Request()
 	user_req.Header.SetMethod("GET")
 	user_req.SetRequestURI(feishuGetUserInfoURL())
-	user_req.Header.Set("Authorization", "Bearer "+accessTokenInfo.AccessToken)
+	user_req.Header.Set("Authorization", "Bearer "+accessTokenInfo.Data.AccessToken)
 
 	if err := u.Parse(); err != nil {
-		logrus.Error(err)
+		logrus.Error("fetch user info failed : ", string(body), err)
 		return AuthInfo{}, err
 	}
 
@@ -114,9 +167,8 @@ func FeishuGetUserInfo(code string) (AuthInfo, error) {
 		return AuthInfo{}, err
 	}
 	if feishuInfoResponse.Code != 0 {
-		logrus.Error(feishuInfoResponse.Message)
+		logrus.Error("fetch user info failed : ", feishuInfoResponse.Message)
 		return AuthInfo{}, errors.New("feishu auth failed")
 	}
-
 	return feishuInfoResponse.Data, nil
 }