class LoginRequest { final String email; final String password; const LoginRequest({required this.email, required this.password}); Map toJson() => {'email': email, 'password': password}; } class RefreshRequest { final String refreshToken; const RefreshRequest({required this.refreshToken}); Map toJson() => {'refresh_token': refreshToken}; } class LogoutRequest { final String refreshToken; const LogoutRequest({required this.refreshToken}); Map toJson() => {'refresh_token': refreshToken}; }