diff --git a/lib/features/finance_workflow/data/datasources/finance_workflow_remote_datasource.dart b/lib/features/finance_workflow/data/datasources/finance_workflow_remote_datasource.dart
index fbbaf14..f8c9e02 100644
--- a/lib/features/finance_workflow/data/datasources/finance_workflow_remote_datasource.dart
+++ b/lib/features/finance_workflow/data/datasources/finance_workflow_remote_datasource.dart
@@ -129,6 +129,66 @@ class FinanceWorkflowRemoteDatasource {
     }
   }
 
+  Future<TransactionApprovalModel> requestApproval({
+    required String transactionId,
+    required String transactionType,
+    required double amount,
+    String? organizationId,
+  }) async {
+    final uri = Uri.parse('${AppConfig.apiBaseUrl}/api/finance/approvals');
+
+    final body = json.encode({
+      'transactionId': transactionId,
+      'transactionType': transactionType,
+      'amount': amount,
+      if (organizationId != null) 'organizationId': organizationId,
+    });
+
+    final response = await client.post(
+      uri,
+      headers: await _getHeaders(),
+      body: body,
+    );
+
+    if (response.statusCode == 201 || response.statusCode == 200) {
+      return TransactionApprovalModel.fromJson(json.decode(response.body));
+    } else if (response.statusCode == 401) {
+      throw UnauthorizedException();
+    } else if (response.statusCode == 400) {
+      throw ValidationException('Données invalides');
+    } else {
+      throw ServerException('Erreur lors de la demande d\'approbation');
+    }
+  }
+
+  Future<List<TransactionApprovalModel>> getApprovalsHistory({
+    required String organizationId,
+    DateTime? startDate,
+    DateTime? endDate,
+    String? status,
+  }) async {
+    final uri = Uri.parse('${AppConfig.apiBaseUrl}/api/finance/approvals/history')
+        .replace(queryParameters: {
+      'organizationId': organizationId,
+      if (startDate != null) 'startDate': startDate.toIso8601String(),
+      if (endDate != null) 'endDate': endDate.toIso8601String(),
+      if (status != null) 'status': status,
+    });
+
+    final response = await client.get(uri, headers: await _getHeaders());
+
+    if (response.statusCode == 200) {
+      final List<dynamic> jsonList = json.decode(response.body);
+      return jsonList
+          .map((json) => TransactionApprovalModel.fromJson(json))
+          .toList();
+    } else if (response.statusCode == 401) {
+      throw UnauthorizedException();
+    } else {
+      throw ServerException('Erreur lors de la récupération de l\'historique');
+    }
+  }
+
   // === BUDGETS ===
 
   Future<List<BudgetModel>> getBudgets({
@@ -226,4 +286,160 @@ class FinanceWorkflowRemoteDatasource {
       throw ServerException('Erreur lors de la récupération du suivi budgétaire');
     }
   }
+
+  Future<BudgetModel> updateBudget({
+    required String budgetId,
+    required Map<String, dynamic> updates,
+  }) async {
+    final uri =
+        Uri.parse('${AppConfig.apiBaseUrl}/api/finance/budgets/$budgetId');
+
+    final body = json.encode(updates);
+
+    final response = await client.put(
+      uri,
+      headers: await _getHeaders(),
+      body: body,
+    );
+
+    if (response.statusCode == 200) {
+      return BudgetModel.fromJson(json.decode(response.body));
+    } else if (response.statusCode == 404) {
+      throw NotFoundException('Budget non trouvé');
+    } else if (response.statusCode == 401) {
+      throw UnauthorizedException();
+    } else if (response.statusCode == 400) {
+      throw ValidationException('Données invalides');
+    } else {
+      throw ServerException('Erreur lors de la mise à jour du budget');
+    }
+  }
+
+  Future<void> deleteBudget({required String budgetId}) async {
+    final uri =
+        Uri.parse('${AppConfig.apiBaseUrl}/api/finance/budgets/$budgetId');
+
+    final response = await client.delete(uri, headers: await _getHeaders());
+
+    if (response.statusCode != 204 && response.statusCode != 200) {
+      if (response.statusCode == 404) {
+        throw NotFoundException('Budget non trouvé');
+      } else if (response.statusCode == 401) {
+        throw UnauthorizedException();
+      } else {
+        throw ServerException('Erreur lors de la suppression du budget');
+      }
+    }
+  }
+
+  // === WORKFLOW STATS & AUDIT ===
+
+  Future<Map<String, dynamic>> getWorkflowStats({
+    String? organizationId,
+    DateTime? startDate,
+    DateTime? endDate,
+  }) async {
+    final uri = Uri.parse('${AppConfig.apiBaseUrl}/api/finance/stats')
+        .replace(queryParameters: {
+      if (organizationId != null) 'organizationId': organizationId,
+      if (startDate != null) 'startDate': startDate.toIso8601String(),
+      if (endDate != null) 'endDate': endDate.toIso8601String(),
+    });
+
+    final response = await client.get(uri, headers: await _getHeaders());
+
+    if (response.statusCode == 200) {
+      return json.decode(response.body) as Map<String, dynamic>;
+    } else if (response.statusCode == 401) {
+      throw UnauthorizedException();
+    } else {
+      throw ServerException('Erreur lors de la récupération des statistiques');
+    }
+  }
+
+  Future<List<Map<String, dynamic>>> getAuditLogs({
+    String? organizationId,
+    DateTime? startDate,
+    DateTime? endDate,
+    String? operation,
+    String? entityType,
+    String? severity,
+    int limit = 100,
+  }) async {
+    final uri = Uri.parse('${AppConfig.apiBaseUrl}/api/finance/audit-logs')
+        .replace(queryParameters: {
+      if (organizationId != null) 'organizationId': organizationId,
+      if (startDate != null) 'startDate': startDate.toIso8601String(),
+      if (endDate != null) 'endDate': endDate.toIso8601String(),
+      if (operation != null) 'operation': operation,
+      if (entityType != null) 'entityType': entityType,
+      if (severity != null) 'severity': severity,
+      'limit': limit.toString(),
+    });
+
+    final response = await client.get(uri, headers: await _getHeaders());
+
+    if (response.statusCode == 200) {
+      final List<dynamic> jsonList = json.decode(response.body);
+      return jsonList.map((e) => e as Map<String, dynamic>).toList();
+    } else if (response.statusCode == 401) {
+      throw UnauthorizedException();
+    } else {
+      throw ServerException('Erreur lors de la récupération des logs d\'audit');
+    }
+  }
+
+  Future<List<Map<String, dynamic>>> getAnomalies({
+    String? organizationId,
+    DateTime? startDate,
+    DateTime? endDate,
+  }) async {
+    final uri = Uri.parse('${AppConfig.apiBaseUrl}/api/finance/audit-logs/anomalies')
+        .replace(queryParameters: {
+      if (organizationId != null) 'organizationId': organizationId,
+      if (startDate != null) 'startDate': startDate.toIso8601String(),
+      if (endDate != null) 'endDate': endDate.toIso8601String(),
+    });
+
+    final response = await client.get(uri, headers: await _getHeaders());
+
+    if (response.statusCode == 200) {
+      final List<dynamic> jsonList = json.decode(response.body);
+      return jsonList.map((e) => e as Map<String, dynamic>).toList();
+    } else if (response.statusCode == 401) {
+      throw UnauthorizedException();
+    } else {
+      throw ServerException('Erreur lors de la récupération des anomalies');
+    }
+  }
+
+  Future<Map<String, dynamic>> exportAuditLogs({
+    String? organizationId,
+    String format = 'csv',
+    DateTime? startDate,
+    DateTime? endDate,
+  }) async {
+    final uri = Uri.parse('${AppConfig.apiBaseUrl}/api/finance/audit-logs/export');
+
+    final body = json.encode({
+      if (organizationId != null) 'organizationId': organizationId,
+      'format': format,
+      if (startDate != null) 'startDate': startDate.toIso8601String(),
+      if (endDate != null) 'endDate': endDate.toIso8601String(),
+    });
+
+    final response = await client.post(
+      uri,
+      headers: await _getHeaders(),
+      body: body,
+    );
+
+    if (response.statusCode == 200) {
+      return json.decode(response.body) as Map<String, dynamic>;
+    } else if (response.statusCode == 401) {
+      throw UnauthorizedException();
+    } else {
+      throw ServerException('Erreur lors de l\'export des logs d\'audit');
+    }
+  }
 }
diff --git a/lib/features/finance_workflow/data/repositories/finance_workflow_repository_impl.dart b/lib/features/finance_workflow/data/repositories/finance_workflow_repository_impl.dart
index 010d942..39f7ac2 100644
--- a/lib/features/finance_workflow/data/repositories/finance_workflow_repository_impl.dart
+++ b/lib/features/finance_workflow/data/repositories/finance_workflow_repository_impl.dart
@@ -325,7 +325,7 @@ class FinanceWorkflowRepositoryImpl implements FinanceWorkflowRepository {
     return false;
   }
 
-  // === MÉTHODES NON IMPLÉMENTÉES (Stubs) ===
+  // === WORKFLOW APPROVALS (EXTENDED) ===
 
   @override
   Future<Either<Failure, TransactionApproval>> requestApproval({
@@ -333,8 +333,29 @@ class FinanceWorkflowRepositoryImpl implements FinanceWorkflowRepository {
     required TransactionType transactionType,
     required double amount,
   }) async {
-    return Left(
-        NotImplementedFailure('Fonctionnalité en cours de développement'));
+    if (!await networkInfo.isConnected) {
+      return Left(NetworkFailure('Pas de connexion Internet'));
+    }
+
+    try {
+      final approval = await _retryPolicy.execute(
+        operation: () => remoteDatasource.requestApproval(
+          transactionId: transactionId,
+          transactionType: transactionType.name,
+          amount: amount,
+        ),
+        shouldRetry: (error) => _isRetryableError(error),
+      );
+      return Right(approval);
+    } on UnauthorizedException {
+      return Left(UnauthorizedFailure('Session expirée'));
+    } on ValidationException catch (e) {
+      return Left(ValidationFailure(e.message));
+    } on ServerException catch (e) {
+      return Left(ServerFailure(e.message));
+    } catch (e) {
+      return Left(UnexpectedFailure('Erreur inattendue: $e'));
+    }
   }
 
   @override
@@ -344,10 +365,36 @@ class FinanceWorkflowRepositoryImpl implements FinanceWorkflowRepository {
     DateTime? endDate,
     ApprovalStatus? status,
   }) async {
-    return Left(
-        NotImplementedFailure('Fonctionnalité en cours de développement'));
+    if (!await networkInfo.isConnected) {
+      return Left(NetworkFailure('Pas de connexion Internet'));
+    }
+
+    try {
+      if (organizationId == null) {
+        return Left(ValidationFailure('organizationId requis'));
+      }
+
+      final approvals = await _retryPolicy.execute(
+        operation: () => remoteDatasource.getApprovalsHistory(
+          organizationId: organizationId,
+          startDate: startDate,
+          endDate: endDate,
+          status: status?.name,
+        ),
+        shouldRetry: (error) => _isRetryableError(error),
+      );
+      return Right(approvals);
+    } on UnauthorizedException {
+      return Left(UnauthorizedFailure('Session expirée'));
+    } on ServerException catch (e) {
+      return Left(ServerFailure(e.message));
+    } catch (e) {
+      return Left(UnexpectedFailure('Erreur inattendue: $e'));
+    }
   }
 
+  // === BUDGETS (EXTENDED) ===
+
   @override
   Future<Either<Failure, Budget>> updateBudget({
     required String budgetId,
@@ -356,16 +403,63 @@ class FinanceWorkflowRepositoryImpl implements FinanceWorkflowRepository {
     List<BudgetLine>? lines,
     BudgetStatus? status,
   }) async {
-    return Left(
-        NotImplementedFailure('Fonctionnalité en cours de développement'));
+    if (!await networkInfo.isConnected) {
+      return Left(NetworkFailure('Pas de connexion Internet'));
+    }
+
+    try {
+      final updates = <String, dynamic>{};
+      if (name != null) updates['name'] = name;
+      if (description != null) updates['description'] = description;
+      if (status != null) updates['status'] = status.name;
+      // Note: lines update not implemented in backend yet
+
+      final budget = await _retryPolicy.execute(
+        operation: () => remoteDatasource.updateBudget(
+          budgetId: budgetId,
+          updates: updates,
+        ),
+        shouldRetry: (error) => _isRetryableError(error),
+      );
+      return Right(budget);
+    } on UnauthorizedException {
+      return Left(UnauthorizedFailure('Session expirée'));
+    } on NotFoundException catch (e) {
+      return Left(NotFoundFailure(e.message));
+    } on ValidationException catch (e) {
+      return Left(ValidationFailure(e.message));
+    } on ServerException catch (e) {
+      return Left(ServerFailure(e.message));
+    } catch (e) {
+      return Left(UnexpectedFailure('Erreur inattendue: $e'));
+    }
   }
 
   @override
   Future<Either<Failure, void>> deleteBudget(String budgetId) async {
-    return Left(
-        NotImplementedFailure('Fonctionnalité en cours de développement'));
+    if (!await networkInfo.isConnected) {
+      return Left(NetworkFailure('Pas de connexion Internet'));
+    }
+
+    try {
+      await _retryPolicy.execute(
+        operation: () => remoteDatasource.deleteBudget(budgetId: budgetId),
+        shouldRetry: (error) => _isRetryableError(error),
+      );
+      return const Right(null);
+    } on UnauthorizedException {
+      return Left(UnauthorizedFailure('Session expirée'));
+    } on NotFoundException catch (e) {
+      return Left(NotFoundFailure(e.message));
+    } on ServerException catch (e) {
+      return Left(ServerFailure(e.message));
+    } catch (e) {
+      return Left(UnexpectedFailure('Erreur inattendue: $e'));
+    }
   }
 
+  // === AUDIT & STATS ===
+
   @override
   Future<Either<Failure, List<FinancialAuditLog>>> getAuditLogs({
     String? organizationId,
@@ -376,8 +470,36 @@ class FinanceWorkflowRepositoryImpl implements FinanceWorkflowRepository {
     AuditSeverity? severity,
     int? limit,
   }) async {
-    return Left(
-        NotImplementedFailure('Fonctionnalité en cours de développement'));
+    if (!await networkInfo.isConnected) {
+      return Left(NetworkFailure('Pas de connexion Internet'));
+    }
+
+    try {
+      final logs = await _retryPolicy.execute(
+        operation: () => remoteDatasource.getAuditLogs(
+          organizationId: organizationId,
+          startDate: startDate,
+          endDate: endDate,
+          operation: operation?.name,
+          entityType: entityType?.name,
+          severity: severity?.name,
+          limit: limit ?? 100,
+        ),
+        shouldRetry: (error) => _isRetryableError(error),
+      );
+
+      // Convert raw maps to FinancialAuditLog entities
+      final auditLogs = logs
+          .map((log) => FinancialAuditLog.fromJson(log))
+          .toList();
+      return Right(auditLogs);
+    } on UnauthorizedException {
+      return Left(UnauthorizedFailure('Session expirée'));
+    } on ServerException catch (e) {
+      return Left(ServerFailure(e.message));
+    } catch (e) {
+      return Left(UnexpectedFailure('Erreur inattendue: $e'));
+    }
   }
 
   @override
@@ -386,8 +508,32 @@ class FinanceWorkflowRepositoryImpl implements FinanceWorkflowRepository {
     DateTime? startDate,
     DateTime? endDate,
   }) async {
-    return Left(
-        NotImplementedFailure('Fonctionnalité en cours de développement'));
+    if (!await networkInfo.isConnected) {
+      return Left(NetworkFailure('Pas de connexion Internet'));
+    }
+
+    try {
+      final anomalies = await _retryPolicy.execute(
+        operation: () => remoteDatasource.getAnomalies(
+          organizationId: organizationId,
+          startDate: startDate,
+          endDate: endDate,
+        ),
+        shouldRetry: (error) => _isRetryableError(error),
+      );
+
+      // Convert raw maps to FinancialAuditLog entities
+      final auditLogs = anomalies
+          .map((log) => FinancialAuditLog.fromJson(log))
+          .toList();
+      return Right(auditLogs);
+    } on UnauthorizedException {
+      return Left(UnauthorizedFailure('Session expirée'));
+    } on ServerException catch (e) {
+      return Left(ServerFailure(e.message));
+    } catch (e) {
+      return Left(UnexpectedFailure('Erreur inattendue: $e'));
+    }
   }
 
   @override
@@ -397,8 +543,34 @@ class FinanceWorkflowRepositoryImpl implements FinanceWorkflowRepository {
     DateTime? endDate,
     String format = 'csv',
   }) async {
-    return Left(
-        NotImplementedFailure('Fonctionnalité en cours de développement'));
+    if (!await networkInfo.isConnected) {
+      return Left(NetworkFailure('Pas de connexion Internet'));
+    }
+
+    try {
+      final result = await _retryPolicy.execute(
+        operation: () => remoteDatasource.exportAuditLogs(
+          organizationId: organizationId,
+          startDate: startDate,
+          endDate: endDate,
+          format: format,
+        ),
+        shouldRetry: (error) => _isRetryableError(error),
+      );
+
+      // Extract export URL from response
+      final exportUrl = result['exportUrl'] as String?;
+      if (exportUrl == null) {
+        return Left(ServerFailure('URL d\'export non disponible'));
+      }
+      return Right(exportUrl);
+    } on UnauthorizedException {
+      return Left(UnauthorizedFailure('Session expirée'));
+    } on ServerException catch (e) {
+      return Left(ServerFailure(e.message));
+    } catch (e) {
+      return Left(UnexpectedFailure('Erreur inattendue: $e'));
+    }
   }
 
   @override
@@ -407,7 +579,26 @@ class FinanceWorkflowRepositoryImpl implements FinanceWorkflowRepository {
     DateTime? startDate,
     DateTime? endDate,
   }) async {
-    return Left(
-        NotImplementedFailure('Fonctionnalité en cours de développement'));
+    if (!await networkInfo.isConnected) {
+      return Left(NetworkFailure('Pas de connexion Internet'));
+    }
+
+    try {
+      final stats = await _retryPolicy.execute(
+        operation: () => remoteDatasource.getWorkflowStats(
+          organizationId: organizationId,
+          startDate: startDate,
+          endDate: endDate,
+        ),
+        shouldRetry: (error) => _isRetryableError(error),
+      );
+      return Right(stats);
+    } on UnauthorizedException {
+      return Left(UnauthorizedFailure('Session expirée'));
+    } on ServerException catch (e) {
+      return Left(ServerFailure(e.message));
+    } catch (e) {
+      return Left(UnexpectedFailure('Erreur inattendue: $e'));
+    }
   }
 }