[chore] Add Surcharge model

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Next Release
 
 - Fix pagination parameters for `GetNextPageOfChildren` function for User service
+- Add `Surcharges` property to `Rate` class
 
 ## v6.7.0 (2024-07-24)
 

EasyPost/Models/API/Beta/StatelessRate.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using EasyPost._base;
 using Newtonsoft.Json;
 
@@ -105,6 +106,12 @@ public class StatelessRate : EphemeralEasyPostObject
         [JsonProperty("shipment_id")]
         public string? ShipmentId { get; set; }
 
+        /// <summary>
+        ///     The list of <see cref="Surcharge"/>s for this rate.
+        /// </summary>
+        [JsonProperty("surcharges")]
+        public List<Surcharge>? Surcharges { get; set; }
+
         #endregion
     }
 }

EasyPost/Models/API/Rate.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using EasyPost._base;
 using Newtonsoft.Json;
 
@@ -104,8 +105,13 @@ public class Rate : EasyPostObject
         [JsonProperty("shipment_id")]
         public string? ShipmentId { get; set; }
 
-        #endregion
+        /// <summary>
+        ///     The list of <see cref="Surcharge"/>s for this rate.
+        /// </summary>
+        [JsonProperty("surcharges")]
+        public List<Surcharge>? Surcharges { get; set; }
 
+        #endregion
     }
 }
 #pragma warning disable CA1724 // Naming conflicts with Parameters.Beta.Rate

EasyPost/Models/API/Surcharge.cs

@@ -0,0 +1,45 @@
+using EasyPost._base;
+using Newtonsoft.Json;
+
+namespace EasyPost.Models.API
+{
+    /// <summary>
+    ///     Class representing a surcharge for a <see cref="Rate"/> object.
+    /// </summary>
+    public class Surcharge : EphemeralEasyPostObject
+    {
+        #region JSON Properties
+
+        /// <summary>
+        ///     The type of surcharge.
+        /// </summary>
+        [JsonProperty("type")]
+        public string? Type { get; set; }
+
+        /// <summary>
+        ///     The amount of the surcharge.
+        /// </summary>
+        [JsonProperty("carrier")]
+        public string? Amount { get; set; }
+
+        /// <summary>
+        ///     The list amount of the surcharge.
+        /// </summary>
+        [JsonProperty("list_amount")]
+        public string? ListAmount { get; set; }
+
+        /// <summary>
+        ///     The retail amount of the surcharge.
+        /// </summary>
+        [JsonProperty("retail_amount")]
+        public string? RetailAmount { get; set; }
+
+        /// <summary>
+        ///     The currency for the surcharge.
+        /// </summary>
+        [JsonProperty("currency")]
+        public string? Currency { get; set; }
+
+        #endregion
+    }
+}