diff --git a/src/lib/types/index.ts b/src/lib/types/index.ts
index 0d4372f..4cbf327 100644
--- a/src/lib/types/index.ts
+++ b/src/lib/types/index.ts
@@ -1,3 +1,7 @@
+//////////////////////////
+//    product domain    //
+//////////////////////////
+
 // product
 export * from './product.type';
 
@@ -16,8 +20,15 @@ export * from './review.type';
 // session
 export * from './session.type';
 
+///////////////////////
+//    common type    //
+///////////////////////
+
 // storage
 export * from './storage.type';
 
 // weekday
 export * from './weekday.type';
+
+// oauth provider
+export * from './ouath-provider.type';
diff --git a/src/lib/types/ouath-provider.type.ts b/src/lib/types/ouath-provider.type.ts
new file mode 100644
index 0000000..d67d176
--- /dev/null
+++ b/src/lib/types/ouath-provider.type.ts
@@ -0,0 +1 @@
+export type OAuthProviderType = 'NAVER' | 'KAKAO' | 'APPLE' | 'BASIC';
diff --git a/src/lib/types/session.type.ts b/src/lib/types/session.type.ts
index e40dbcd..119d552 100644
--- a/src/lib/types/session.type.ts
+++ b/src/lib/types/session.type.ts
@@ -1,3 +1,5 @@
+import {OAuthProviderType} from './ouath-provider.type';
+
 export type SessionType = {
   accessToken: string;
   refreshToken?: string;
@@ -9,5 +11,5 @@ export type SessionType = {
    * @description refreshToken 만료 시간 (Oauth 로그인 시)
    */
   refreshTokenExpiresAt?: number;
-  OAuthProvider: 'NAVER' | 'KAKAO' | 'APPLE' | 'BASIC';
+  OAuthProvider: OAuthProviderType;
 };
diff --git a/src/network/api-client/api-client.ts b/src/network/api-client/api-client.ts
index a87aeee..877dfea 100644
--- a/src/network/api-client/api-client.ts
+++ b/src/network/api-client/api-client.ts
@@ -20,34 +20,9 @@ class ApiClient {
 
   private sessionOptions: ApiClientOptions['sessionOptions'];
 
-  private async expiredSession() {
-    await this.sessionOptions.setStorage('session', {});
-    this._jwt = null;
-    const expiredError = new CustomError({
-      errorCode: 401,
-      errorMessage: '세션이 만료되어 로그아웃되었습니다.',
-    });
-    throw expiredError;
-  }
-
-  private async setAuthorizationHeader(config: InternalAxiosRequestConfig): Promise<void> {
-    const session: SessionType | null = await this.sessionOptions.getStorage('session');
-    this._jwt = session?.accessToken ?? null;
-
-    if (!this._jwt) {
-      return;
-    }
-
-    // accessToken이 있으면 Authorization 헤더에 추가
-    if (this._jwt) {
-      config.headers.Authorization = `Bearer ${this._jwt}`;
-    } else {
-      config.headers.Authorization = null;
-    }
-  }
-
   private constructor({serverApiBaseUrl, sessionOptions}: ApiClientOptions) {
     this.sessionOptions = sessionOptions;
+
     this.axiosInstance = axios.create({
       baseURL: serverApiBaseUrl,
       headers: {
@@ -107,6 +82,32 @@ class ApiClient {
     );
   }
 
+  private async expiredSession() {
+    await this.sessionOptions.setStorage('session', {});
+    this._jwt = null;
+    const expiredError = new CustomError({
+      errorCode: 401,
+      errorMessage: '세션이 만료되어 로그아웃되었습니다.',
+    });
+    throw expiredError;
+  }
+
+  private async setAuthorizationHeader(config: InternalAxiosRequestConfig): Promise<void> {
+    const session: SessionType | null = await this.sessionOptions.getStorage('session');
+    this._jwt = session?.accessToken ?? null;
+
+    if (!this._jwt) {
+      return;
+    }
+
+    // accessToken이 있으면 Authorization 헤더에 추가
+    if (this._jwt) {
+      config.headers.Authorization = `Bearer ${this._jwt}`;
+    } else {
+      config.headers.Authorization = null;
+    }
+  }
+
   public static getInstance(): ApiClient {
     if (!ApiClient.instance) {
       throw new Error('ApiClient is not initialized:\nApiClient.create() must be called before getInstance()');