diff --git a/src/Integration.Hub/IntegrationBase.cs b/src/Integration.Hub/IntegrationBase.cs
index b4929a6..e2f3bde 100644
--- a/src/Integration.Hub/IntegrationBase.cs
+++ b/src/Integration.Hub/IntegrationBase.cs
@@ -6,11 +6,24 @@ namespace Integration.Hub;
 public class IntegrationBase
 {
     protected static readonly HttpClient _httpClient;
+    protected static JsonSerializerOptions _options = default!;
     static IntegrationBase()
     {
         _httpClient = new HttpClient();
     }
 
+    protected void IntializeDefaultHeaders(Dictionary<string, string> headers)
+    {
+        // Add default headers to the request
+        foreach (var header in headers)
+            _httpClient.DefaultRequestHeaders.Add(header.Key, header.Value);
+    }
+
+    protected void SetSerializerOptions(JsonSerializerOptions options)
+    {
+        _options = options;
+    }
+
     public async Task<TResponse> InvokeRequestAsync<TResponse>(Func<HttpClient, Task<HttpResponseMessage>> httpRequest) where TResponse : IResponseModel
     {
         var response = await httpRequest.Invoke(_httpClient);
@@ -19,7 +32,7 @@ public async Task<TResponse> InvokeRequestAsync<TResponse>(Func<HttpClient, Task
         if (!isSuccess)
             throw new Exception(responseAsString);
 
-        return JsonSerializer.Deserialize<TResponse>(responseAsString)!;
+        return JsonSerializer.Deserialize<TResponse>(responseAsString, _options)!;
     }
 
     public async Task<bool> InvokeRequestAsync(Func<HttpClient, Task<HttpResponseMessage>> httpRequest)
@@ -43,7 +56,7 @@ public async Task<TResponse> InvokeRequestAsync<TResponse>(Func<HttpClient, Stri
         var isSuccess = response.IsSuccessStatusCode;
         if (!isSuccess)
             throw new Exception(responseAsString);
-        return JsonSerializer.Deserialize<TResponse>(responseAsString)!;
+        return JsonSerializer.Deserialize<TResponse>(responseAsString, _options)!;
     }
 
     public async Task<bool> InvokeRequestAsync(Func<HttpClient, StringContent?, Task<HttpResponseMessage>> httpRequest, IRequestModel requestModel)
diff --git a/src/Marketplaces/Integration.Marketplaces.Hepsiburada/Infrastructure/HepsiburadaIntegration.cs b/src/Marketplaces/Integration.Marketplaces.Hepsiburada/Infrastructure/HepsiburadaIntegration.cs
index ac641d4..1ed49b7 100644
--- a/src/Marketplaces/Integration.Marketplaces.Hepsiburada/Infrastructure/HepsiburadaIntegration.cs
+++ b/src/Marketplaces/Integration.Marketplaces.Hepsiburada/Infrastructure/HepsiburadaIntegration.cs
@@ -1,3 +1,5 @@
+using System.Text;
+using System.Text.Json;
 using Integration.Hub;
 
 namespace Integration.Marketplaces.Trendyol.Infrastructure;
@@ -14,6 +16,17 @@ public HepsiburadaIntegrationBase(string username, string password, bool isInPro
         _username = username ?? throw new ArgumentNullException(nameof(username));
         _password = password ?? throw new ArgumentNullException(nameof(password));
         _isInProduction = isInProduction;
+
+        IntializeDefaultHeaders(new Dictionary<string, string>
+        {
+            { "Accept", "application/json" },
+            { "Authorization", $"Basic {Convert.ToBase64String(Encoding.ASCII.GetBytes($"{_username}:{_password}"))}"}
+        });
+
+        SetSerializerOptions(new JsonSerializerOptions
+        {
+            PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+        });
     }
 
     public string GetBaseUrl() => _isInProduction ? ProdBaseUrl : StageBaseUrl;
diff --git a/src/Marketplaces/Integration.Marketplaces.Hepsiburada/Infrastructure/ProductIntegration/HepsiburadaProductIntegration.cs b/src/Marketplaces/Integration.Marketplaces.Hepsiburada/Infrastructure/ProductIntegration/HepsiburadaProductIntegration.cs
index ecda96c..7d8ca54 100644
--- a/src/Marketplaces/Integration.Marketplaces.Hepsiburada/Infrastructure/ProductIntegration/HepsiburadaProductIntegration.cs
+++ b/src/Marketplaces/Integration.Marketplaces.Hepsiburada/Infrastructure/ProductIntegration/HepsiburadaProductIntegration.cs
@@ -6,9 +6,9 @@ namespace Integration.Marketplaces.Hepsiburada.Infrastructure.ProductIntegration
 
 public class HepsiburadaProductIntegration : HepsiburadaIntegrationBase, IHepsiburadaProductIntegration, IMarketplaceIntegration
 {
-    private string GetCategoriesUrl() => $"{GetBaseUrl}product/api/categories/get-all-categories";
-    private string GetCategoryAttributesUrl(int categoryId) => $"{GetBaseUrl}product/api/categories/{categoryId}/attributes";
-    private string GetCategoryAttributeValueUrl(int categoryId, string attributeId) => $"{GetBaseUrl}product/api/categories/{categoryId}/attribute/{attributeId}/v";
+    private string GetCategoriesUrl() => $"{GetBaseUrl()}product/api/categories/get-all-categories";
+    private string GetCategoryAttributesUrl(int categoryId) => $"{GetBaseUrl()}product/api/categories/{categoryId}/attributes";
+    private string GetCategoryAttributeValueUrl(int categoryId, string attributeId) => $"{GetBaseUrl()}product/api/categories/{categoryId}/attribute/{attributeId}/v";
 
     public HepsiburadaProductIntegration(string username, string password, bool isInProduction = true) : base(username, password, isInProduction)
     {
diff --git a/src/Marketplaces/Integration.Marketplaces.Trendyol/Infrastructure/ClaimIntegration/TrendyolClaimIntegration.cs b/src/Marketplaces/Integration.Marketplaces.Trendyol/Infrastructure/ClaimIntegration/TrendyolClaimIntegration.cs
index 11c4f7f..f4ba81a 100644
--- a/src/Marketplaces/Integration.Marketplaces.Trendyol/Infrastructure/ClaimIntegration/TrendyolClaimIntegration.cs
+++ b/src/Marketplaces/Integration.Marketplaces.Trendyol/Infrastructure/ClaimIntegration/TrendyolClaimIntegration.cs
@@ -6,9 +6,9 @@
 
 public class TrendyolClaimIntegration : TrendyolIntegrationBase, ITrendyolClaimIntegration, IMarketplaceIntegration
 {
-    private string GetClaimsUrl() => $"{GetBaseUrl}suppliers/{_supplierId}/claims";
-    private string GetCreateClaimUrl() => $"{GetBaseUrl}suppliers/{_supplierId}/claims/create";
-    private string GetApproveClaimLineItemUrl(string claimId) => $"{GetBaseUrl}claims/{claimId}/items/approve";
+    private string GetClaimsUrl() => $"{GetBaseUrl()}suppliers/{_supplierId}/claims";
+    private string GetCreateClaimUrl() => $"{GetBaseUrl()}suppliers/{_supplierId}/claims/create";
+    private string GetApproveClaimLineItemUrl(string claimId) => $"{GetBaseUrl()}claims/{claimId}/items/approve";
     public TrendyolClaimIntegration(string supplierId, string apiKey, string apiSecret, bool isInProduction, string entegratorFirm) : base(supplierId, apiKey, apiSecret, isInProduction, entegratorFirm)
     {
     }
diff --git a/src/Marketplaces/Integration.Marketplaces.Trendyol/Infrastructure/PackageIntegration/TrendyolPackageIntegration.cs b/src/Marketplaces/Integration.Marketplaces.Trendyol/Infrastructure/PackageIntegration/TrendyolPackageIntegration.cs
index 2cb4673..33bd78e 100644
--- a/src/Marketplaces/Integration.Marketplaces.Trendyol/Infrastructure/PackageIntegration/TrendyolPackageIntegration.cs
+++ b/src/Marketplaces/Integration.Marketplaces.Trendyol/Infrastructure/PackageIntegration/TrendyolPackageIntegration.cs
@@ -6,16 +6,16 @@
 namespace Integration.Marketplaces.Trendyol.Infrastructure.ProductIntegration;
 public class TrendyolPackageIntegration : TrendyolIntegrationBase, ITrendyolPackageIntegration, IMarketplaceIntegration
 {
-    private string GetShipmentPackagesUrl() => $"{GetBaseUrl}suppliers/{_supplierId}/orders";
-    private string GetUpdateTrackingNumberUrl(long shipmentPackageId) => $"{GetBaseUrl}suppliers/{_supplierId}/{shipmentPackageId}/update-tracking-number";
-    private string GetUpdatePackageUrl(long shipmentPackageId) => $"{GetBaseUrl}suppliers/{_supplierId}//shipment-packages/{shipmentPackageId}";
-    private string GetAddInvoiceLinkUrl() => $"{GetBaseUrl}suppliers/{_supplierId}/supplier-invoice-links";
-    private string GetDeleteInvoiceLinkUrl() => $"{GetBaseUrl}suppliers/{_supplierId}/supplier-invoice-links/delete";
-    private string GetSplitMultiPackageByQuantityUrl(long _shipmentPackageId) => $"{GetBaseUrl}suppliers/{_supplierId}/shipment-packages/{_shipmentPackageId}/split-packages";
-    private string GetSplitMultiShipmentPackageUrl(long _shipmentPackageId) => $"{GetBaseUrl}suppliers/{_supplierId}/shipment-packages/{_shipmentPackageId}/split";
-    private string GetSplitShipmentPackageUrl(long _shipmentPackageId) => $"{GetBaseUrl}suppliers/{_supplierId}/shipment-packages/{_shipmentPackageId}/multi-split";
-    private string GetSplitShipmentPackageByQuantityUrl(long _shipmentPackageId) => $"{GetBaseUrl}suppliers/{_supplierId}/shipment-packages/{_shipmentPackageId}/quantity-split";
-    private string GetUpdateBoxInfoUrl(long _shipmentPackageId) => $"{GetBaseUrl}suppliers/{_supplierId}/shipment-packages/{_shipmentPackageId}/box-info";
+    private string GetShipmentPackagesUrl() => $"{GetBaseUrl()}suppliers/{_supplierId}/orders";
+    private string GetUpdateTrackingNumberUrl(long shipmentPackageId) => $"{GetBaseUrl()}suppliers/{_supplierId}/{shipmentPackageId}/update-tracking-number";
+    private string GetUpdatePackageUrl(long shipmentPackageId) => $"{GetBaseUrl()}suppliers/{_supplierId}//shipment-packages/{shipmentPackageId}";
+    private string GetAddInvoiceLinkUrl() => $"{GetBaseUrl()}suppliers/{_supplierId}/supplier-invoice-links";
+    private string GetDeleteInvoiceLinkUrl() => $"{GetBaseUrl()}suppliers/{_supplierId}/supplier-invoice-links/delete";
+    private string GetSplitMultiPackageByQuantityUrl(long _shipmentPackageId) => $"{GetBaseUrl()}suppliers/{_supplierId}/shipment-packages/{_shipmentPackageId}/split-packages";
+    private string GetSplitMultiShipmentPackageUrl(long _shipmentPackageId) => $"{GetBaseUrl()}suppliers/{_supplierId}/shipment-packages/{_shipmentPackageId}/split";
+    private string GetSplitShipmentPackageUrl(long _shipmentPackageId) => $"{GetBaseUrl()}suppliers/{_supplierId}/shipment-packages/{_shipmentPackageId}/multi-split";
+    private string GetSplitShipmentPackageByQuantityUrl(long _shipmentPackageId) => $"{GetBaseUrl()}suppliers/{_supplierId}/shipment-packages/{_shipmentPackageId}/quantity-split";
+    private string GetUpdateBoxInfoUrl(long _shipmentPackageId) => $"{GetBaseUrl()}suppliers/{_supplierId}/shipment-packages/{_shipmentPackageId}/box-info";
     public TrendyolPackageIntegration(string supplierId, string apiKey, string apiSecret, bool isInProduction, string entegratorFirm) : base(supplierId, apiKey, apiSecret, isInProduction, entegratorFirm)
     {
     }
diff --git a/src/Marketplaces/Integration.Marketplaces.Trendyol/Infrastructure/ProductIntegration/TrendyolProductIntegration.cs b/src/Marketplaces/Integration.Marketplaces.Trendyol/Infrastructure/ProductIntegration/TrendyolProductIntegration.cs
index c76c2c2..e41467d 100644
--- a/src/Marketplaces/Integration.Marketplaces.Trendyol/Infrastructure/ProductIntegration/TrendyolProductIntegration.cs
+++ b/src/Marketplaces/Integration.Marketplaces.Trendyol/Infrastructure/ProductIntegration/TrendyolProductIntegration.cs
@@ -7,16 +7,16 @@
 namespace Integration.Marketplaces.Trendyol.Infrastructure.ProductIntegration;
 public class TrendyolProductIntegration : TrendyolIntegrationBase, ITrendyolProductIntegration, IMarketplaceIntegration
 {
-    private string GetCreateProducsUrl() => $"{GetBaseUrl}suppliers/{_supplierId}/v2/products";
-    private string GetSupplierAddressUrl() => $"{GetBaseUrl}suppliers/{_supplierId}/addresses";
-    private string GetBrandsUrl() => $"{GetBaseUrl}brands";
-    private string GetCategoryTreeUrl() => $"{GetBaseUrl}product-categories";
-    private string GetCategoryAttributesUrl(int categoryId) => $"{GetBaseUrl}product-categories/{categoryId}/attributes";
-    private string GetUpdateProductUrl() => $"{GetBaseUrl}suppliers/{_supplierId}/v2/products";
-    private string GetUpdatePriceAndStockUrl() => $"{GetBaseUrl}suppliers/{_supplierId}/products/price-and-inventory";
-    private string GetDeleteProductUrl() => $"{GetBaseUrl}suppliers/{_supplierId}/v2/products";
-    private string GetBatchRequestResultUrl(string batchRequestId) => $"{GetBaseUrl}suppliers/{_supplierId}/products/batch-requests/{batchRequestId}";
-    private string GetFilterProductsUrl() => $"{GetBaseUrl}suppliers/{_supplierId}/products";
+    private string GetCreateProducsUrl() => $"{GetBaseUrl()}suppliers/{_supplierId}/v2/products";
+    private string GetSupplierAddressUrl() => $"{GetBaseUrl()}suppliers/{_supplierId}/addresses";
+    private string GetBrandsUrl() => $"{GetBaseUrl()}brands";
+    private string GetCategoryTreeUrl() => $"{GetBaseUrl()}product-categories";
+    private string GetCategoryAttributesUrl(int categoryId) => $"{GetBaseUrl()}product-categories/{categoryId}/attributes";
+    private string GetUpdateProductUrl() => $"{GetBaseUrl()}suppliers/{_supplierId}/v2/products";
+    private string GetUpdatePriceAndStockUrl() => $"{GetBaseUrl()}suppliers/{_supplierId}/products/price-and-inventory";
+    private string GetDeleteProductUrl() => $"{GetBaseUrl()}suppliers/{_supplierId}/v2/products";
+    private string GetBatchRequestResultUrl(string batchRequestId) => $"{GetBaseUrl()}suppliers/{_supplierId}/products/batch-requests/{batchRequestId}";
+    private string GetFilterProductsUrl() => $"{GetBaseUrl()}suppliers/{_supplierId}/products";
     public TrendyolProductIntegration(string supplierId, string apiKey, string apiSecret, bool isInProduction, string entegratorFirm) : base(supplierId, apiKey, apiSecret, isInProduction, entegratorFirm)
     {
     }
diff --git a/src/Marketplaces/Integration.Marketplaces.Trendyol/Infrastructure/TrendyolIntegration.cs b/src/Marketplaces/Integration.Marketplaces.Trendyol/Infrastructure/TrendyolIntegration.cs
index ae7df70..bf1dcaa 100644
--- a/src/Marketplaces/Integration.Marketplaces.Trendyol/Infrastructure/TrendyolIntegration.cs
+++ b/src/Marketplaces/Integration.Marketplaces.Trendyol/Infrastructure/TrendyolIntegration.cs
@@ -1,3 +1,5 @@
+using System.Text;
+using System.Text.Json;
 using Integration.Hub;
 
 namespace Integration.Marketplaces.Trendyol.Infrastructure;
@@ -18,6 +20,18 @@ public TrendyolIntegrationBase(string supplierId, string apiKey, string apiSecre
         _apiSecret = apiSecret ?? throw new ArgumentNullException(nameof(apiSecret));
         _isInProduction = isInProduction;
         _entegratorFirm = entegratorFirm;
+
+        IntializeDefaultHeaders(new Dictionary<string, string>
+        {
+            { "Accept", "application/json" },
+            { "User-Agent", $"{_supplierId} - {_entegratorFirm}" },
+            { "Authorization", $"Basic {Convert.ToBase64String(Encoding.ASCII.GetBytes($"{_apiKey}:{_apiSecret}"))}"}
+        });
+
+        SetSerializerOptions(new JsonSerializerOptions
+        {
+            PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+        });
     }
 
     public string GetBaseUrl() => _isInProduction ? ProdBaseUrl : StageBaseUrl;