diff --git a/src/ZendeskApi_v2/Core.cs b/src/ZendeskApi_v2/Core.cs
index 93baeec9..58c9cce5 100644
--- a/src/ZendeskApi_v2/Core.cs
+++ b/src/ZendeskApi_v2/Core.cs
@@ -13,6 +13,7 @@
 using Newtonsoft.Json;
 using ZendeskApi_v2.Extensions;
 using ZendeskApi_v2.Models.Shared;
+using System.Collections.Specialized;
 
 namespace ZendeskApi_v2
 {
@@ -28,14 +29,14 @@ public interface ICore
     {
 #if SYNC
         T GetByPageUrl<T>(string pageUrl, int perPage = 100);
-        T RunRequest<T>(string resource, string requestMethod, object body = null, int? timeout = null, Dictionary<string, object> formParameters = null);
-        RequestResult RunRequest(string resource, string requestMethod, object body = null, int? timeout = null, Dictionary<string, object> formParameters = null);
+        T RunRequest<T>(string resource, string requestMethod, object body = null, int? timeout = null, Dictionary<string, object> formParameters = null, NameValueCollection headers = null);
+        RequestResult RunRequest(string resource, string requestMethod, object body = null, int? timeout = null, Dictionary<string, object> formParameters = null, NameValueCollection headers = null);
 #endif
 
 #if ASYNC
         Task<T> GetByPageUrlAsync<T>(string pageUrl, int perPage = 100);
-        Task<T> RunRequestAsync<T>(string resource, string requestMethod, object body = null, int? timeout = null, Dictionary<string, object> formParameters = null);
-        Task<RequestResult> RunRequestAsync(string resource, string requestMethod, object body = null, int? timeout = null, Dictionary<string, object> formParameters = null);
+        Task<T> RunRequestAsync<T>(string resource, string requestMethod, object body = null, int? timeout = null, Dictionary<string, object> formParameters = null, NameValueCollection headers = null);
+        Task<RequestResult> RunRequestAsync(string resource, string requestMethod, object body = null, int? timeout = null, Dictionary<string, object> formParameters = null, NameValueCollection headers = null);
 #endif
     }
 
@@ -116,14 +117,14 @@ public T GetByPageUrl<T>(string pageUrl, int perPage = 100)
             return RunRequest<T>(resource, RequestMethod.Get);
         }
 
-        public T RunRequest<T>(string resource, string requestMethod, object body = null, int? timeout = null, Dictionary<string, object> formParameters = null)
+        public T RunRequest<T>(string resource, string requestMethod, object body = null, int? timeout = null, Dictionary<string, object> formParameters = null, NameValueCollection headers = null)
         {
-            var response = RunRequest(resource, requestMethod, body, timeout, formParameters);
+            var response = RunRequest(resource, requestMethod, body, timeout, formParameters, headers);
             var obj = JsonConvert.DeserializeObject<T>(response.Content, jsonSettings);
             return obj;
         }
 
-        public RequestResult RunRequest(string resource, string requestMethod, object body = null, int? timeout = null, Dictionary<string, object> formParameters = null)
+        public RequestResult RunRequest(string resource, string requestMethod, object body = null, int? timeout = null, Dictionary<string, object> formParameters = null, NameValueCollection headers = null)
         {
             try
             {
@@ -137,6 +138,11 @@ public RequestResult RunRequest(string resource, string requestMethod, object bo
                 }
 
                 req.Headers["Authorization"] = GetPasswordOrTokenAuthHeader();
+                if (headers != null)
+                {
+                    req.Headers.Add(headers);
+                }
+
                 req.PreAuthenticate = true;
                 AddCustomHeaders(req);
 
@@ -297,9 +303,9 @@ protected T GenericDelete<T>(string resource)
             return res;
         }
 
-        protected T GenericPost<T>(string resource, object body = null)
+        protected T GenericPost<T>(string resource, object body = null, NameValueCollection headers = null)
         {
-            var res = RunRequest<T>(resource, RequestMethod.Post, body);
+            var res = RunRequest<T>(resource, RequestMethod.Post, body, headers: headers);
             return res;
         }
 
@@ -373,14 +379,14 @@ public async Task<T> GetByPageUrlAsync<T>(string pageUrl, int perPage = 100)
             return await RunRequestAsync<T>(resource, RequestMethod.Get);
         }
 
-        public async Task<T> RunRequestAsync<T>(string resource, string requestMethod, object body = null, int? timeout = null, Dictionary<string, object> formParameters = null)
+        public async Task<T> RunRequestAsync<T>(string resource, string requestMethod, object body = null, int? timeout = null, Dictionary<string, object> formParameters = null, NameValueCollection headers = null)
         {
             var response = await RunRequestAsync(resource, requestMethod, body, timeout, formParameters);
             var obj = Task.Factory.StartNew(() => JsonConvert.DeserializeObject<T>(response.Content, jsonSettings));
             return await obj;
         }
 
-        public async Task<RequestResult> RunRequestAsync(string resource, string requestMethod, object body = null, int? timeout = null, Dictionary<string, object> formParameters = null)
+        public async Task<RequestResult> RunRequestAsync(string resource, string requestMethod, object body = null, int? timeout = null, Dictionary<string, object> formParameters = null, NameValueCollection headers = null)
         {
             var requestUrl = ZendeskUrl + resource;
             try
@@ -389,6 +395,11 @@ public async Task<RequestResult> RunRequestAsync(string resource, string request
                 req.ContentType = "application/json";
 
                 req.Headers["Authorization"] = GetPasswordOrTokenAuthHeader();
+                if (headers != null)
+                {
+                    req.Headers.Add(headers);
+                }
+
                 req.Method = requestMethod; //GET POST PUT DELETE
                 req.Accept = "application/json, application/xml, text/json, text/x-json, text/javascript, text/xml";
                 AddCustomHeaders(req);
@@ -546,9 +557,9 @@ protected async Task<T> GenericDeleteAsync<T>(string resource)
             return await res;
         }
 
-        protected async Task<T> GenericPostAsync<T>(string resource, object body = null)
+        protected async Task<T> GenericPostAsync<T>(string resource, object body = null, NameValueCollection headers = null)
         {
-            return await RunRequestAsync<T>(resource, RequestMethod.Post, body);
+            return await RunRequestAsync<T>(resource, RequestMethod.Post, body, headers: headers);
         }
 
         protected async Task<T> GenericPostFormAsync<T>(string resource, object body = null, Dictionary<string, object> formParameters = null)
diff --git a/src/ZendeskApi_v2/Requests/Tickets.cs b/src/ZendeskApi_v2/Requests/Tickets.cs
index 7c761c79..63d7d14c 100644
--- a/src/ZendeskApi_v2/Requests/Tickets.cs
+++ b/src/ZendeskApi_v2/Requests/Tickets.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Collections.Specialized;
 using System.Net;
 
 #if ASYNC
@@ -77,7 +78,16 @@ public interface ITickets : ICore
 
         GroupTicketResponse GetMultipleTickets(IEnumerable<long> ids, TicketSideLoadOptionsEnum sideLoadOptions = TicketSideLoadOptionsEnum.None);
 
-        IndividualTicketResponse CreateTicket(Ticket ticket);
+        /// <summary>
+        /// Creates a ticket.
+        /// If a idempotency-key is provided and the same request using the same body and idempotency key is repeated, another ticket is not created.
+        /// Instead, you'll get the same response as before that is cached under the idempotency key
+        /// </summary>
+        /// <param name="ticket"></param>
+        /// <param name="idempotencyKey">The Ticketing API lets you specify an idempotency key that allows you to retry a ticket creation request without the
+        /// risk of creating duplicate records.</param>
+        /// <returns></returns>
+        IndividualTicketResponse CreateTicket(Ticket ticket, string idempotencyKey = null);
 
         JobStatusResponse CreateManyTickets(IEnumerable<Ticket> tickets);
 
@@ -188,7 +198,16 @@ public interface ITickets : ICore
 
         Task<GroupTicketResponse> GetMultipleTicketsAsync(IEnumerable<long> ids, TicketSideLoadOptionsEnum sideLoadOptions = TicketSideLoadOptionsEnum.None);
 
-        Task<IndividualTicketResponse> CreateTicketAsync(Ticket ticket);
+        /// <summary>
+        /// Creates a ticket.
+        /// If a idempotency-key is provided and the same request using the same body and idempotency key is repeated, another ticket is not created.
+        /// Instead, you'll get the same response as before that is cached under the idempotency key
+        /// </summary>
+        /// <param name="ticket"></param>
+        /// <param name="idempotencyKey">The Ticketing API lets you specify an idempotency key that allows you to retry a ticket creation request without the
+        /// risk of creating duplicate records.</param>
+        /// <returns></returns>
+        Task<IndividualTicketResponse> CreateTicketAsync(Ticket ticket, string idempotencyKey = null);
 
         Task<JobStatusResponse> CreateManyTicketsAsync(IEnumerable<Ticket> tickets);
 
@@ -418,9 +437,18 @@ public GroupTicketResponse GetMultipleTickets(IEnumerable<long> ids, TicketSideL
             return GenericGet<GroupTicketResponse>(resource);
         }
 
-        public IndividualTicketResponse CreateTicket(Ticket ticket)
+        public IndividualTicketResponse CreateTicket(Ticket ticket, string idempotencyKey = null)
         {
-            return GenericPost<IndividualTicketResponse>($"{_tickets}.json", new { ticket });
+            NameValueCollection headers = null;
+            if (!string.IsNullOrEmpty(idempotencyKey))
+            {
+                headers = new NameValueCollection
+                {
+                    { "Idempotency-Key", idempotencyKey }
+                };
+            }
+
+            return GenericPost<IndividualTicketResponse>($"{_tickets}.json", new { ticket }, headers: headers);
         }
 
         public JobStatusResponse CreateManyTickets(IEnumerable<Ticket> tickets)
@@ -798,9 +826,18 @@ public async Task<GroupTicketResponse> GetMultipleTicketsAsync(IEnumerable<long>
             return await GenericGetAsync<GroupTicketResponse>(GetResourceStringWithSideLoadOptionsParam($"{_tickets}/show_many.json?ids={ids.ToCsv()}", sideLoadOptions));
         }
 
-        public async Task<IndividualTicketResponse> CreateTicketAsync(Ticket ticket)
+        public async Task<IndividualTicketResponse> CreateTicketAsync(Ticket ticket, string idempotencyKey = null)
         {
-            return await GenericPostAsync<IndividualTicketResponse>($"{_tickets}.json", new { ticket });
+            NameValueCollection headers = null;
+            if (!string.IsNullOrEmpty(idempotencyKey))
+            {
+                headers = new NameValueCollection
+                {
+                    { "Idempotency-Key", idempotencyKey }
+                };
+            }
+
+            return await GenericPostAsync<IndividualTicketResponse>($"{_tickets}.json", new { ticket }, headers: headers);
         }
 
         public async Task<JobStatusResponse> CreateManyTicketsAsync(IEnumerable<Ticket> tickets)
diff --git a/src/global.json b/src/global.json
index d5aa2bf7..27414bdd 100644
--- a/src/global.json
+++ b/src/global.json
@@ -1,5 +1,5 @@
 {
   "sdk": {
-    "version": "6.0.408"
+    "version": "6.0.423"
   }
 }