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lib/domain/usecases/create_advance_usecase.dart

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+import 'package:dartz/dartz.dart';
+import '../../core/error/failures.dart';
+import '../models/advance_request_model.dart';
+import '../repositories/advance_repository.dart';
+
+class CreateAdvanceUseCase {
+  final AdvanceRepository repository;
+
+  CreateAdvanceUseCase({required this.repository});
+
+  Future<Either<Failure, AdvanceResponseModel>> call(AdvanceRequestModel request) {
+    return repository.createAdvance(request);
+  }
+}

lib/domain/usecases/get_advances_usecase.dart

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+import 'package:dartz/dartz.dart';
+import '../../core/error/failures.dart';
+import '../models/advances_list_response_model.dart';
+import '../repositories/advance_repository.dart';
+
+class GetAdvancesUseCase {
+  final AdvanceRepository repository;
+
+  GetAdvancesUseCase({required this.repository});
+
+  Future<Either<Failure, AdvancesListResponseModel>> call() {
+    return repository.getAdvances();
+  }
+}

lib/domain/usecases/get_vacations_usecase.dart

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+import 'package:dartz/dartz.dart';
+import '../../core/error/failures.dart';
+import '../models/vacations_list_response_model.dart';
+import '../repositories/vacation_repository.dart';
+
+class GetVacationsUseCase {
+  final VacationRepository repository;
+
+  GetVacationsUseCase({required this.repository});
+
+  Future<Either<Failure, VacationsListResponseModel>> call() {
+    return repository.getVacations();
+  }
+}