diff --git a/fems-api/src/services/permission.service.js b/fems-api/src/services/permission.service.js
index 4c3205a..04cfdc0 100644
--- a/fems-api/src/services/permission.service.js
+++ b/fems-api/src/services/permission.service.js
@@ -1,7 +1,7 @@
 // src/services/permission.service.js
 const { Role, UserRole, User } = require("../models");
 const redis = require("../config/redis");
-const logger = require("../utils/logger");
+const logger = require("./config/logger");
 
 class PermissionService {
   constructor() {
diff --git a/fems-realtime-api/src/app.js b/fems-realtime-api/src/app.js
index 55a745e..e8af1df 100644
--- a/fems-realtime-api/src/app.js
+++ b/fems-realtime-api/src/app.js
@@ -6,7 +6,8 @@ const MainBackendService = require("./services/mainBackend.service");
 const MQTTService = require("./services/mqtt.service");
 const SensorDataModel = require("./models/SensorData");
 const createDataController = require("./controllers/data.controller");
-const logger = require("./utils/logger");
+// 다른 서비스나 컨트롤러 파일들
+const logger = require("./config/logger");
 const config = require("./config/config");
 
 async function bootstrap() {
diff --git a/fems-realtime-api/src/middleware/apiKey.middleware.js b/fems-realtime-api/src/middleware/apiKey.middleware.js
index 1e41615..3ef2edd 100644
--- a/fems-realtime-api/src/middleware/apiKey.middleware.js
+++ b/fems-realtime-api/src/middleware/apiKey.middleware.js
@@ -1,5 +1,5 @@
 // fems-realtime-api/src/middleware/apiKey.middleware.js
-const logger = require("../utils/logger");
+const logger = require("./config/logger");
 
 const apiKeyAuth = async (req, res, next) => {
   const apiKey = req.header("X-API-Key");
diff --git a/fems-realtime-api/src/services/mainBackend.service.js b/fems-realtime-api/src/services/mainBackend.service.js
index c121302..52ba818 100644
--- a/fems-realtime-api/src/services/mainBackend.service.js
+++ b/fems-realtime-api/src/services/mainBackend.service.js
@@ -1,6 +1,6 @@
 // fems-realtime-api/src/services/mainBackend.service.js
 const axios = require("axios");
-const logger = require("../utils/logger");
+const logger = require("./config/logger");
 
 class MainBackendService {
   constructor(redis, baseURL, adminApiKey) {
@@ -16,21 +16,21 @@ class MainBackendService {
   async checkSubscription(companyId) {
     try {
       // Redis에서 캐시된 구독 상태 확인
-      const cached = await this.redis.get(`subscription:${companyId}`);
+      const cached = await this.redis.get(`contracts:${companyId}`);
       if (cached) {
         return JSON.parse(cached);
       }
 
       // 메인 백엔드에서 구독 상태 조회
       const response = await this.client.get(
-        `/api/v1/admin/subscription/companies/${companyId}/subscription/status`
+        `/api/v1/admin/contracts/companies/${companyId}/subscription/status`
       );
 
       const status = response.data;
 
       // 구독 상태 캐싱 (1시간)
       await this.redis.set(
-        `subscription:${companyId}`,
+        `contracts:${companyId}`,
         JSON.stringify(status),
         "EX",
         3600
diff --git a/fems-realtime-api/src/services/mqtt.service.js b/fems-realtime-api/src/services/mqtt.service.js
index d534bcd..73c37f8 100644
--- a/fems-realtime-api/src/services/mqtt.service.js
+++ b/fems-realtime-api/src/services/mqtt.service.js
@@ -1,6 +1,6 @@
 // fems-realtime-api/src/services/mqtt.service.js
 const mqtt = require("mqtt");
-const logger = require("../utils/logger");
+const logger = require("./config/logger");
 
 class MQTTService {
   constructor(mainBackend, sensorData, redis, brokerUrl, options) {
diff --git a/fems-realtime-api/src/utils/logger.js b/fems-realtime-api/src/utils/logger.js
deleted file mode 100644
index 0c1fd11..0000000
--- a/fems-realtime-api/src/utils/logger.js
+++ /dev/null
@@ -1,59 +0,0 @@
-// src/utils/logger.js
-const winston = require("winston");
-const { createLogger, format, transports } = winston;
-const { combine, timestamp, printf, colorize } = format;
-
-// 로그 포맷 정의
-const logFormat = printf(({ level, message, timestamp, ...metadata }) => {
-  let msg = `${timestamp} [${level}] : ${message}`;
-
-  if (Object.keys(metadata).length > 0) {
-    msg += JSON.stringify(metadata);
-  }
-
-  return msg;
-});
-
-// 로거 생성
-const logger = createLogger({
-  format: combine(timestamp({ format: "YYYY-MM-DD HH:mm:ss" }), logFormat),
-  transports: [
-    // 콘솔 출력
-    new transports.Console({
-      format: combine(colorize(), logFormat),
-    }),
-    // 에러 로그 파일
-    new transports.File({
-      filename: "logs/error.log",
-      level: "error",
-    }),
-    // 전체 로그 파일
-    new transports.File({
-      filename: "logs/combined.log",
-    }),
-  ],
-});
-
-// 감사 로그를 위한 별도 로거
-const auditLogger = createLogger({
-  format: combine(
-    timestamp(),
-    printf(({ message, timestamp, ...metadata }) => {
-      return JSON.stringify({
-        timestamp,
-        ...message,
-        ...metadata,
-      });
-    })
-  ),
-  transports: [
-    new transports.File({
-      filename: "logs/audit.log",
-    }),
-  ],
-});
-
-module.exports = {
-  logger,
-  auditLogger,
-};