feat: implement idempotency key for critical API endpoints

lib/infrastructure/order/repositories/order_repository.dart

@@ -110,6 +110,7 @@ class OrderRepository implements IOrderRepository {
   Future<Either<OrderFailure, Order>> addItemOrder({
     required String id,
     required List<AddItemOrderRequest> request,
+    String? idempotencyKey,
   }) async {
     try {
       final result = await _dataProvider.addItemOrder(
@@ -117,6 +118,7 @@ class OrderRepository implements IOrderRepository {
         request: request
             .map((e) => AddItemOrderRequestDto.fromDomain(e))
             .toList(),
+        idempotencyKey: idempotencyKey,
       );
 
       if (result.hasError) {
@@ -134,10 +136,12 @@ class OrderRepository implements IOrderRepository {
   @override
   Future<Either<OrderFailure, Payment>> createPayment({
     required PaymentRequest request,
+    String? idempotencyKey,
   }) async {
     try {
       final result = await _dataProvider.storePayment(
         PaymentRequestDto.fromDomain(request),
+        idempotencyKey: idempotencyKey,
       );
 
       if (result.hasError) {
@@ -158,6 +162,7 @@ class OrderRepository implements IOrderRepository {
     required String reason,
     String type = "ITEM",
     required List<OrderItem> orderItems,
+    String? idempotencyKey,
   }) async {
     try {
       final result = await _dataProvider.voidOrder(
@@ -165,6 +170,7 @@ class OrderRepository implements IOrderRepository {
         reason: reason,
         type: type,
         orderItems: orderItems.map((e) => OrderItemDto.fromDomain(e)).toList(),
+        idempotencyKey: idempotencyKey,
       );
 
       if (result.hasError) {
@@ -180,11 +186,13 @@ class OrderRepository implements IOrderRepository {
 
   @override
   Future<Either<OrderFailure, Payment>> createSplitBill(
-    PaymentSplitBillRequest request,
-  ) async {
+    PaymentSplitBillRequest request, {
+    String? idempotencyKey,
+  }) async {
     try {
       final result = await _dataProvider.createSplitBill(
         PaymentSplitBillRequestDto.fromDomain(request),
+        idempotencyKey: idempotencyKey,
       );
 
       if (result.hasError) {
@@ -204,12 +212,14 @@ class OrderRepository implements IOrderRepository {
     required String id,
     required String reason,
     required int refundAmount,
+    String? idempotencyKey,
   }) async {
     try {
       final result = await _dataProvider.refundPayment(
         id: id,
         reason: reason,
         refundAmount: refundAmount,
+        idempotencyKey: idempotencyKey,
       );
       if (result.hasError) {
         return left(result.error!);