diff --git a/backend/src/controllers/invitationController.js b/backend/src/controllers/invitationController.js
index a2e5f62..b3c297a 100644
--- a/backend/src/controllers/invitationController.js
+++ b/backend/src/controllers/invitationController.js
@@ -11,7 +11,7 @@ const invitationService = require('../services/invitationService');
  */
 const generateInvitationCode = async (req, res) => {
   try {
-    const userId = req.user.userId;
+    const userId = req.user.id;
 
     const user = await invitationService.generateInvitationCodeForUser(userId);
 
@@ -39,7 +39,7 @@ const generateInvitationCode = async (req, res) => {
  */
 const getInvitationStats = async (req, res) => {
   try {
-    const userId = req.user.userId;
+    const userId = req.user.id;
 
     const stats = await invitationService.getInvitationStats(userId);
 
@@ -65,7 +65,7 @@ const getInvitationStats = async (req, res) => {
  */
 const getInvitationRecords = async (req, res) => {
   try {
-    const userId = req.user.userId;
+    const userId = req.user.id;
     const { page, limit } = req.query;
 
     const result = await invitationService.getInvitationRecords(userId, {
diff --git a/backend/src/services/invitationService.js b/backend/src/services/invitationService.js
index 0b5b3d9..52c68e0 100644
--- a/backend/src/services/invitationService.js
+++ b/backend/src/services/invitationService.js
@@ -1,7 +1,4 @@
-const User = require('../models/User');
-const Invitation = require('../models/Invitation');
-const Appointment = require('../models/Appointment');
-const { sequelize } = require('../config/database');
+const { User, Invitation, Appointment, sequelize } = require('../models');
 const { generateInvitationCode } = require('./authService');
 
 /**