Merge pull request #134 from TechyChap/main

Fixed ListingItemPutRequest serilization

Author: abuzuhri

Source/FikaAmazonAPI/Parameter/ListingsItems/ParameterPutListingItem.cs

@@ -1,5 +1,7 @@
-using FikaAmazonAPI.Search;
+using FikaAmazonAPI.Search;
 using FikaAmazonAPI.Utils;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Converters;
 using System;
 using System.Collections.Generic;
 using System.IO;
@@ -29,11 +31,11 @@ public bool Check()
             {
                 throw new InvalidDataException("ListingsItemPutRequest is a required property for ParameterPutListingItem and cannot be null");
             }
-            if (string.IsNullOrWhiteSpace(this.listingsItemPutRequest.ProductType)) 
+            if (string.IsNullOrWhiteSpace(this.listingsItemPutRequest.productType)) 
             {
                 throw new InvalidDataException("ProductType is a required property for ListingsItemPutRequest and cannot be null");
             }
-            if (this.listingsItemPutRequest.Attributes==null)
+            if (this.listingsItemPutRequest.attributes==null)
             {
                 throw new InvalidDataException("Attributes is a required property for ListingsItemPutRequest and cannot be null");
             }
@@ -53,13 +55,14 @@ public bool Check()
 
     public class ListingsItemPutRequest
     {
-        public string ProductType { get; set; }
+        public string productType { get; set; }
 
-        public Requirements Requirements { get; set; }
+        public Requirements requirements { get; set; }
 
-        public Object Attributes { get; set; }
+        public Object attributes { get; set; }
     }
 
+    [JsonConverter(typeof(StringEnumConverter))]
     public enum Requirements
     {
         LISTING,