added tier prices

BrickOwlSharp.Client/Inventory.cs

@@ -89,5 +89,8 @@ public class Inventory
 
         [JsonPropertyName("type")]
         public string Type{ get; set; }
+
+        [JsonPropertyName("tier_price"), JsonConverter(typeof(TierPriceListConverter))]
+        public List<TierPrice> TierPrices { get; set; }
     }
 }

BrickOwlSharp.Client/Json/TierPriceListConverter.cs

@@ -0,0 +1,59 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Text.Json.Serialization;
+using System.Text.Json;
+
+namespace BrickOwlSharp.Client.Json
+{
+    internal class TierPriceListConverter : JsonConverter<List<TierPrice>>
+    {
+        public override List<TierPrice> Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            var tierPrices = new List<TierPrice>();
+
+            if (reader.TokenType != JsonTokenType.StartArray)
+            {
+                throw new JsonException();
+            }
+
+            while (reader.Read())
+            {
+                if (reader.TokenType == JsonTokenType.EndArray)
+                {
+                    break;
+                }
+
+                if (reader.TokenType != JsonTokenType.StartArray)
+                {
+                    throw new JsonException();
+                }
+
+                reader.Read();
+                var threshold = reader.GetString();
+                reader.Read();
+                var price = reader.GetString();
+                tierPrices.Add(new TierPrice
+                {
+                    Quantity = int.Parse(threshold),
+                    Price = decimal.Parse(price)
+                });
+
+                reader.Read();
+                if (reader.TokenType != JsonTokenType.EndArray)
+                {
+                    throw new JsonException();
+                }
+            }
+
+            return tierPrices;
+        }
+
+
+        public override void Write(Utf8JsonWriter writer, List<TierPrice> value, JsonSerializerOptions options)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
+

BrickOwlSharp.Client/TierPrice.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace BrickOwlSharp.Client
+{
+    public class TierPrice
+    {
+        public int Quantity { get; set; }
+        public decimal Price { get; set; }
+    }
+}