diff --git a/GAMSS/Sources/Core/Network/Endpoint.swift b/GAMSS/Sources/Core/Network/Endpoint.swift
deleted file mode 100644
index 239976f..0000000
--- a/GAMSS/Sources/Core/Network/Endpoint.swift
+++ /dev/null
@@ -1,60 +0,0 @@
-//
-//  Endpoint.swift
-//  GAMSS
-//
-//  Created by 이건준 on 7/19/26.
-//
-
-import Foundation
-
-protocol Endpoint {
-    var baseURLString: String { get }
-    var path: String { get }
-    var method: HTTPMethod { get }
-    var body: Encodable? { get }
-}
-
-extension Endpoint {
-    var baseURLString: String {
-        return Environment.baseURL
-    }
-    
-    var headers: [String: String] {
-        return [
-            "Content-Type": "application/json",
-            "Accept": "application/json"
-        ]
-    }
-    
-    func asURLRequest() throws -> URLRequest {
-        guard let url = URL(
-            string: "\(baseURLString)\(path)"
-        ) else {
-            throw NetworkError.invalidURL
-        }
-        
-        var request = URLRequest(url: url)
-        request.httpMethod = method.rawValue
-        
-        headers.forEach {
-            request.setValue(
-                $1,
-                forHTTPHeaderField: $0
-            )
-        }
-        
-        if let body {
-            request.httpBody = try JSONEncoder().encode(body)
-        }
-        
-        return request
-    }
-}
-
-enum HTTPMethod: String {
-    case get = "GET"
-    case post = "POST"
-    case put = "PUT"
-    case patch = "PATCH"
-    case delete = "DELETE"
-}
diff --git a/GAMSS/Sources/Core/Network/Foundation/Endpoint.swift b/GAMSS/Sources/Core/Network/Foundation/Endpoint.swift
new file mode 100644
index 0000000..274fda2
--- /dev/null
+++ b/GAMSS/Sources/Core/Network/Foundation/Endpoint.swift
@@ -0,0 +1,64 @@
+//
+//  Endpoint.swift
+//  GAMSS
+//
+//  Created by 이건준 on 7/19/26.
+//
+
+import Foundation
+
+protocol Endpoint {
+    var baseURLString: String { get }
+    var path: String { get }
+    var method: HTTPMethod { get }
+    var parameters: [RequestParameter] { get }
+    var header: HTTPHeader { get }
+}
+
+extension Endpoint {
+    var baseURLString: String {
+        return Environment.baseURL
+    }
+    
+    func asURLRequest() throws -> URLRequest {
+        guard var components = URLComponents(
+            string: "\(baseURLString)\(path)"
+        ) else {
+            throw NetworkError.invalidURL
+        }
+        
+        var httpBody: Data?
+        
+        for parameter in parameters {
+            switch parameter {
+            case let .query(query):
+                components.queryItems = (components.queryItems ?? []) + query.map {
+                    URLQueryItem(
+                        name: $0.key,
+                        value: $0.value
+                    )
+                }
+                
+            case let .body(body):
+                httpBody = try JSONEncoder().encode(body)
+            }
+        }
+        
+        guard let url = components.url else {
+            throw NetworkError.invalidURL
+        }
+        
+        var request = URLRequest(url: url)
+        request.httpMethod = method.rawValue
+        request.httpBody = httpBody
+        
+        header.fields.forEach {
+            request.setValue(
+                $1,
+                forHTTPHeaderField: $0
+            )
+        }
+        
+        return request
+    }
+}
diff --git a/GAMSS/Sources/Core/Network/Foundation/HttpHeader.swift b/GAMSS/Sources/Core/Network/Foundation/HttpHeader.swift
new file mode 100644
index 0000000..2fca924
--- /dev/null
+++ b/GAMSS/Sources/Core/Network/Foundation/HttpHeader.swift
@@ -0,0 +1,40 @@
+//
+//  HttpHeader.swift
+//  GAMSS
+//
+//  Created by 이건준 on 8/8/26.
+//
+
+import Foundation
+
+enum HTTPHeader {
+    case `default`
+    case authorization
+    case custom([String: String])
+    
+    private var commonFields: [String: String] {
+        [
+            "Content-Type": "application/json",
+            "Accept": "application/json"
+        ]
+    }
+    
+    var fields: [String: String] {
+        switch self {
+        case .default:
+            return commonFields
+            
+        case .authorization:
+            var fields = commonFields
+            
+            if let accessToken = TokenStorage.shared.readToken(.accessToken) {
+                fields["Authorization"] = "Bearer \(accessToken)"
+            }
+            
+            return fields
+            
+        case let .custom(headers):
+            return headers
+        }
+    }
+}
diff --git a/GAMSS/Sources/Core/Network/Foundation/HttpMethod.swift b/GAMSS/Sources/Core/Network/Foundation/HttpMethod.swift
new file mode 100644
index 0000000..aa8dcb4
--- /dev/null
+++ b/GAMSS/Sources/Core/Network/Foundation/HttpMethod.swift
@@ -0,0 +1,16 @@
+//
+//  HttpMethod.swift
+//  GAMSS
+//
+//  Created by 이건준 on 8/8/26.
+//
+
+import Foundation
+
+enum HTTPMethod: String {
+    case get = "GET"
+    case post = "POST"
+    case put = "PUT"
+    case patch = "PATCH"
+    case delete = "DELETE"
+}
diff --git a/GAMSS/Sources/Core/Network/Foundation/RequestParameter.swift b/GAMSS/Sources/Core/Network/Foundation/RequestParameter.swift
new file mode 100644
index 0000000..4410aea
--- /dev/null
+++ b/GAMSS/Sources/Core/Network/Foundation/RequestParameter.swift
@@ -0,0 +1,13 @@
+//
+//  RequestParameter.swift
+//  GAMSS
+//
+//  Created by 이건준 on 8/8/26.
+//
+
+import Foundation
+
+enum RequestParameter {
+    case query([String: String])
+    case body(Encodable)
+}
diff --git a/GAMSS/Sources/Data/DTO/LoginRequestDTO.swift b/GAMSS/Sources/Data/DTO/Auth/Request/LoginRequestDTO.swift
similarity index 100%
rename from GAMSS/Sources/Data/DTO/LoginRequestDTO.swift
rename to GAMSS/Sources/Data/DTO/Auth/Request/LoginRequestDTO.swift
diff --git a/GAMSS/Sources/Data/DTO/Auth/Request/ReissueTokenRequestDTO.swift b/GAMSS/Sources/Data/DTO/Auth/Request/ReissueTokenRequestDTO.swift
new file mode 100644
index 0000000..2ede1e5
--- /dev/null
+++ b/GAMSS/Sources/Data/DTO/Auth/Request/ReissueTokenRequestDTO.swift
@@ -0,0 +1,12 @@
+//
+//  ReissueTokenRequestDTO.swift
+//  GAMSS
+//
+//  Created by 이건준 on 8/8/26.
+//
+
+import Foundation
+
+struct ReissueTokenRequestDTO: Encodable {
+    let refreshToken: String
+}
diff --git a/GAMSS/Sources/Data/DTO/LoginResponseDTO.swift b/GAMSS/Sources/Data/DTO/Auth/Response/LoginResponseDTO.swift
similarity index 100%
rename from GAMSS/Sources/Data/DTO/LoginResponseDTO.swift
rename to GAMSS/Sources/Data/DTO/Auth/Response/LoginResponseDTO.swift
diff --git a/GAMSS/Sources/Data/DTO/Card/Request/CreateCardRequestDTO.swift b/GAMSS/Sources/Data/DTO/Card/Request/CreateCardRequestDTO.swift
new file mode 100644
index 0000000..1b4319a
--- /dev/null
+++ b/GAMSS/Sources/Data/DTO/Card/Request/CreateCardRequestDTO.swift
@@ -0,0 +1,14 @@
+//
+//  CreateCardsRequestDTO.swift
+//  GAMSS
+//
+//  Created by 이건준 on 8/8/26.
+//
+
+import Foundation
+
+struct CreateCardRequestDTO: Encodable {
+    let conversationId: Int
+    let emotion: String
+    let summary: String
+}
diff --git a/GAMSS/Sources/Data/DTO/Chat/Request/CreateCommentRequestDTO.swift b/GAMSS/Sources/Data/DTO/Chat/Request/CreateCommentRequestDTO.swift
new file mode 100644
index 0000000..b176a38
--- /dev/null
+++ b/GAMSS/Sources/Data/DTO/Chat/Request/CreateCommentRequestDTO.swift
@@ -0,0 +1,13 @@
+//
+//  CreateCommentRequestDTO.swift
+//  GAMSS
+//
+//  Created by 이건준 on 8/8/26.
+//
+
+import Foundation
+
+struct CreateCommentRequestDTO: Encodable {
+    let messageId: Int
+    let currentConversationSummary: String
+}
diff --git a/GAMSS/Sources/Data/DTO/Chat/Request/CreateMessageRequestDTO.swift b/GAMSS/Sources/Data/DTO/Chat/Request/CreateMessageRequestDTO.swift
new file mode 100644
index 0000000..8f821e5
--- /dev/null
+++ b/GAMSS/Sources/Data/DTO/Chat/Request/CreateMessageRequestDTO.swift
@@ -0,0 +1,16 @@
+//
+//  CreateMessageRequestDTO.swift
+//  GAMSS
+//
+//  Created by 이건준 on 8/8/26.
+//
+
+import Foundation
+
+struct CreateMessageRequestDTO: Encodable {
+    let conversationId: Int
+    let content: String
+    let repliesMessageId: Int
+    let currentConversationSummary: String
+    let excludeCharacters: [String]
+}
diff --git a/GAMSS/Sources/Data/DTO/Chat/Request/UpdateChatTitleRequestDTO.swift b/GAMSS/Sources/Data/DTO/Chat/Request/UpdateChatTitleRequestDTO.swift
new file mode 100644
index 0000000..b4dda5b
--- /dev/null
+++ b/GAMSS/Sources/Data/DTO/Chat/Request/UpdateChatTitleRequestDTO.swift
@@ -0,0 +1,12 @@
+//
+//  UpdateChatTitleRequestDTO.swift
+//  GAMSS
+//
+//  Created by 이건준 on 8/8/26.
+//
+
+import Foundation
+
+struct UpdateChatTitleRequestDTO: Encodable {
+    let title: String
+}
diff --git a/GAMSS/Sources/Data/DTO/APIResponse.swift b/GAMSS/Sources/Data/DTO/Common/APIResponse.swift
similarity index 100%
rename from GAMSS/Sources/Data/DTO/APIResponse.swift
rename to GAMSS/Sources/Data/DTO/Common/APIResponse.swift
diff --git a/GAMSS/Sources/Data/DTO/EmptyResponseDTO.swift b/GAMSS/Sources/Data/DTO/Common/EmptyResponseDTO.swift
similarity index 100%
rename from GAMSS/Sources/Data/DTO/EmptyResponseDTO.swift
rename to GAMSS/Sources/Data/DTO/Common/EmptyResponseDTO.swift
diff --git a/GAMSS/Sources/Data/DTO/Member/Request/UpdateNicknameRequestDTO.swift b/GAMSS/Sources/Data/DTO/Member/Request/UpdateNicknameRequestDTO.swift
new file mode 100644
index 0000000..ac56960
--- /dev/null
+++ b/GAMSS/Sources/Data/DTO/Member/Request/UpdateNicknameRequestDTO.swift
@@ -0,0 +1,12 @@
+//
+//  UpdateNicknameRequestDTO.swift
+//  GAMSS
+//
+//  Created by 이건준 on 8/8/26.
+//
+
+import Foundation
+
+struct UpdateNicknameRequestDTO: Encodable {
+    let nickname: String
+}
diff --git a/GAMSS/Sources/Data/Endpoint/AuthEndpoint.swift b/GAMSS/Sources/Data/Endpoint/AuthEndpoint.swift
index a7381ba..a9c41b4 100644
--- a/GAMSS/Sources/Data/Endpoint/AuthEndpoint.swift
+++ b/GAMSS/Sources/Data/Endpoint/AuthEndpoint.swift
@@ -9,11 +9,17 @@ import Foundation
 
 enum AuthEndpoint: Endpoint {
     case login(LoginRequestDTO)
+    case logout
+    case reissueToken(ReissueTokenRequestDTO)
     
     var path: String {
         switch self {
         case .login:
             return "/api/auth/login"
+        case .logout:
+            return "/api/auth/logout"
+        case .reissueToken:
+            return "/api/auth/reissue"
         }
     }
     
@@ -21,13 +27,30 @@ enum AuthEndpoint: Endpoint {
         switch self {
         case .login:
             return .post
+        case .logout:
+            return .post
+        case .reissueToken:
+            return .post
         }
     }
     
-    var body: Encodable? {
+    var parameters: [RequestParameter] {
         switch self {
         case let .login(request):
-            return request
+            return [.body(request)]
+        case .logout:
+            return []
+        case let .reissueToken(request):
+            return [.body(request)]
+        }
+    }
+    
+    var header: HTTPHeader {
+        switch self {
+        case .login, .reissueToken:
+            return .default
+        case .logout:
+            return .authorization
         }
     }
 }
diff --git a/GAMSS/Sources/Data/Endpoint/CardEndpoint.swift b/GAMSS/Sources/Data/Endpoint/CardEndpoint.swift
new file mode 100644
index 0000000..c6623d2
--- /dev/null
+++ b/GAMSS/Sources/Data/Endpoint/CardEndpoint.swift
@@ -0,0 +1,79 @@
+//
+//  CardEndpoint.swift
+//  GAMSS
+//
+//  Created by 이건준 on 8/8/26.
+//
+
+import Foundation
+
+enum CardEndpoint: Endpoint {
+    case fetchCards(date: String)
+    case createCard(CreateCardRequestDTO)
+    case deleteAllCards
+    case fetchCard(cardId: String)
+    case deleteCard(cardId: String)
+    case fetchMonthlyCards(yearMonth: String)
+    case deleteCardsByEmotion(emotion: String)
+    
+    var path: String {
+        switch self {
+        case .fetchCards:
+            return "/api/cards"
+        case .createCard:
+            return "/api/cards"
+        case .deleteAllCards:
+            return "/api/cards"
+        case let .fetchCard(cardId):
+            return "/api/cards/\(cardId)"
+        case let .deleteCard(cardId):
+            return "/api/cards/\(cardId)"
+        case .fetchMonthlyCards:
+            return "/api/cards/monthly"
+        case let .deleteCardsByEmotion(emotion):
+            return "/api/cards/emotions/\(emotion)"
+        }
+    }
+    
+    var method: HTTPMethod {
+        switch self {
+        case .fetchCards:
+            return .get
+        case .createCard:
+            return .post
+        case .deleteAllCards:
+            return .delete
+        case .fetchCard:
+            return .get
+        case .deleteCard:
+            return .delete
+        case .fetchMonthlyCards:
+            return .get
+        case .deleteCardsByEmotion:
+            return .delete
+        }
+    }
+    
+    var parameters: [RequestParameter] {
+        switch self {
+        case let .fetchCards(date):
+            return [.query(["date": date])]
+        case let .createCard(request):
+            return [.body(request)]
+        case .deleteAllCards:
+            return []
+        case .fetchCard:
+            return []
+        case .deleteCard:
+            return []
+        case let .fetchMonthlyCards(yearMonth):
+            return [.query(["yearMonth": yearMonth])]
+        case .deleteCardsByEmotion:
+            return []
+        }
+    }
+    
+    var header: HTTPHeader {
+        .authorization
+    }
+}
diff --git a/GAMSS/Sources/Data/Endpoint/ChatEndpoint.swift b/GAMSS/Sources/Data/Endpoint/ChatEndpoint.swift
new file mode 100644
index 0000000..08a8a9d
--- /dev/null
+++ b/GAMSS/Sources/Data/Endpoint/ChatEndpoint.swift
@@ -0,0 +1,94 @@
+//
+//  ChatEndpoint.swift
+//  GAMSS
+//
+//  Created by 이건준 on 8/8/26.
+//
+
+import Foundation
+
+enum ChatEndpoint: Endpoint {
+    case endChat(chatId: Int)
+    case createMessage(CreateMessageRequestDTO)
+    case createComment(CreateCommentRequestDTO)
+    case createReply(messageId: Int)
+    case updateTitle(chatId: String, UpdateChatTitleRequestDTO)
+    case fetchChats(date: String)
+    case fetchMessages(chatId: String)
+    case searchChats(keyword: String, page: Int, size: Int)
+    case fetchIncompleteChats
+    case deleteChat(chatId: String)
+    
+    var path: String {
+        switch self {
+        case let .endChat(chatId):
+            return "/api/conversations/\(chatId)/end"
+        case .createMessage:
+            return "/api/conversations/messages"
+        case .createComment:
+            return "/api/conversations/messages/comments"
+        case let .createReply(messageId):
+            return "/api/conversations/messages/comments/\(messageId)"
+        case let .updateTitle(chatId, _):
+            return "/api/conversations/\(chatId)/title"
+        case .fetchChats:
+            return "/api/conversations"
+        case let .fetchMessages(chatId):
+            return "/api/conversations/\(chatId)/messages"
+        case .searchChats:
+            return "/api/conversations/search"
+        case .fetchIncompleteChats:
+            return "/api/conversations/incomplete"
+        case let .deleteChat(chatId):
+            return "/api/conversations/\(chatId)"
+        }
+    }
+    
+    var method: HTTPMethod {
+        switch self {
+        case .endChat,
+             .createMessage,
+             .createComment,
+             .createReply:
+            return .post
+        case .updateTitle:
+            return .patch
+        case .fetchChats,
+             .fetchMessages,
+             .searchChats,
+             .fetchIncompleteChats:
+            return .get
+        case .deleteChat:
+            return .delete
+        }
+    }
+    
+    var parameters: [RequestParameter] {
+        switch self {
+        case .endChat:
+            return []
+        case let .createMessage(request):
+            return [.body(request)]
+        case let .createComment(request):
+            return [.body(request)]
+        case .createReply:
+            return []
+        case let .updateTitle(_, request):
+            return [.body(request)]
+        case let .fetchChats(date):
+            return [.query(["date": date])]
+        case .fetchMessages:
+            return []
+        case let .searchChats(keyword, page, size):
+            return [.query(["keyword": keyword, "page": "\(page)", "size": "\(size)"])]
+        case .fetchIncompleteChats:
+            return []
+        case .deleteChat:
+            return []
+        }
+    }
+    
+    var header: HTTPHeader {
+        .authorization
+    }
+}
diff --git a/GAMSS/Sources/Data/Endpoint/MemberEndpoint.swift b/GAMSS/Sources/Data/Endpoint/MemberEndpoint.swift
new file mode 100644
index 0000000..ebd8155
--- /dev/null
+++ b/GAMSS/Sources/Data/Endpoint/MemberEndpoint.swift
@@ -0,0 +1,56 @@
+//
+//  MemberEndpoint.swift
+//  GAMSS
+//
+//  Created by 이건준 on 8/8/26.
+//
+
+import Foundation
+
+enum MemberEndpoint: Endpoint {
+    case fetchMyProfile
+    case updateNickname(UpdateNicknameRequestDTO)
+    case deleteAccount
+    case fetchMyTokenUsage
+    
+    var path: String {
+        switch self {
+        case .fetchMyProfile:
+            return "/api/members/me"
+        case .updateNickname:
+            return "/api/members/me/nickname"
+        case .deleteAccount:
+            return "/api/members/me"
+        case .fetchMyTokenUsage:
+            return "/api/members/me/token-usage"
+        }
+    }
+    
+    var method: HTTPMethod {
+        switch self {
+        case .fetchMyProfile:
+            return .get
+        case .updateNickname:
+            return .patch
+        case .deleteAccount:
+            return .delete
+        case .fetchMyTokenUsage:
+            return .get
+        }
+    }
+    
+    var parameters: [RequestParameter] {
+        switch self {
+        case .fetchMyProfile:
+            return []
+        case let .updateNickname(request):
+            return [.body(request)]
+        case .deleteAccount:
+            return []
+        case .fetchMyTokenUsage:
+            return []
+        }
+    }
+    
+    var header: HTTPHeader { .authorization }
+}