diff --git a/Iyzipay.Samples/CardManagementPageSample.cs b/Iyzipay.Samples/CardManagementPageSample.cs
index bf94ce2..5b7b07b 100644
--- a/Iyzipay.Samples/CardManagementPageSample.cs
+++ b/Iyzipay.Samples/CardManagementPageSample.cs
@@ -30,7 +30,7 @@ public async Task Should_Initialize_Card_Management_PageAsync()
                 Locale = Locale.TR.ToString()
             };
 
-            CardManagementPageInitialize cardManagementPageInitialize = await CardManagementPageInitialize.Create(request, options);
+            CardManagementPageInitialize cardManagementPageInitialize = CardManagementPageInitialize.Create(request, options);
             PrintResponse(cardManagementPageInitialize);
 
             Assert.AreEqual(Locale.TR.ToString(), cardManagementPageInitialize.Locale);
diff --git a/Iyzipay/IyzipayResourceV2.cs b/Iyzipay/IyzipayResourceV2.cs
index e2d0e73..3800127 100644
--- a/Iyzipay/IyzipayResourceV2.cs
+++ b/Iyzipay/IyzipayResourceV2.cs
@@ -4,6 +4,7 @@
 using System.Linq;
 using System.Net.Http;
 using System.Net.Http.Headers;
+using Newtonsoft.Json;
 
 namespace Iyzipay
 {
@@ -70,7 +71,7 @@ private static String PrepareAuthorizationStringWithRequestBody(BaseRequestV2 re
             String randomKey = GenerateRandomKey();
             String uriPath = FindUriPath(url);
 
-            String payload = request != null ? uriPath + JsonBuilder.SerializeObjectToPrettyJson(request) : uriPath;
+            String payload = request != null ? uriPath + JsonConvert.SerializeObject(request) : uriPath;
             String dataToEncrypt = randomKey + payload;
             String hash = HashGeneratorV2.GenerateHash(options.ApiKey, options.SecretKey, randomKey, dataToEncrypt); 
             return IYZIWS_V2_HEADER_NAME + hash;