diff --git a/src/redmine-net-api/Extensions/RedmineManagerExtensions.cs b/src/redmine-net-api/Extensions/RedmineManagerExtensions.cs
index d4447c21..254e4855 100644
--- a/src/redmine-net-api/Extensions/RedmineManagerExtensions.cs
+++ b/src/redmine-net-api/Extensions/RedmineManagerExtensions.cs
@@ -34,7 +34,106 @@ namespace Redmine.Net.Api.Extensions
     /// </summary>
     public static class RedmineManagerExtensions
     {
-       /// <summary>
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="redmineManager"></param>
+        /// <param name="projectIdentifier"></param>
+        /// <param name="requestOptions"></param>
+        /// <returns></returns>
+        public static void ArchiveProject(this RedmineManager redmineManager, string projectIdentifier, RequestOptions requestOptions = null)
+        {
+            var uri = redmineManager.RedmineApiUrls.ProjectArchive(projectIdentifier);
+
+            var escapedUri = Uri.EscapeDataString(uri);
+            
+            redmineManager.ApiClient.Update(escapedUri, string.Empty ,requestOptions);
+        }
+        
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="redmineManager"></param>
+        /// <param name="projectIdentifier"></param>
+        /// <param name="requestOptions"></param>
+        /// <returns></returns>
+        public static void UnarchiveProject(this RedmineManager redmineManager, string projectIdentifier, RequestOptions requestOptions = null)
+        {
+            var uri = redmineManager.RedmineApiUrls.ProjectUnarchive(projectIdentifier);
+
+            var escapedUri = Uri.EscapeDataString(uri);
+            
+            redmineManager.ApiClient.Update(escapedUri, string.Empty ,requestOptions);
+        }
+        
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="redmineManager"></param>
+        /// <param name="projectIdentifier"></param>
+        /// <param name="requestOptions"></param>
+        /// <returns></returns>
+        public static void ReopenProject(this RedmineManager redmineManager, string projectIdentifier, RequestOptions requestOptions = null)
+        {
+            var uri = redmineManager.RedmineApiUrls.ProjectReopen(projectIdentifier);
+
+            var escapedUri = Uri.EscapeDataString(uri);
+            
+            redmineManager.ApiClient.Update(escapedUri, string.Empty ,requestOptions);
+        }
+        
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="redmineManager"></param>
+        /// <param name="projectIdentifier"></param>
+        /// <param name="requestOptions"></param>
+        /// <returns></returns>
+        public static void CloseProject(this RedmineManager redmineManager, string projectIdentifier, RequestOptions requestOptions = null)
+        {
+            var uri = redmineManager.RedmineApiUrls.ProjectClose(projectIdentifier);
+
+            var escapedUri = Uri.EscapeDataString(uri);
+            
+            redmineManager.ApiClient.Update(escapedUri,string.Empty, requestOptions);
+        }
+        
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="redmineManager"></param>
+        /// <param name="projectIdentifier"></param>
+        /// <param name="repositoryIdentifier"></param>
+        /// <param name="revision"></param>
+        /// <param name="requestOptions"></param>
+        public static void ProjectRepositoryAddRelatedIssue(this RedmineManager redmineManager, string projectIdentifier, string repositoryIdentifier, string revision, RequestOptions requestOptions = null)
+        {
+            var uri = redmineManager.RedmineApiUrls.ProjectRepositoryAddRelatedIssue(projectIdentifier, repositoryIdentifier, revision);
+            
+            var escapedUri = Uri.EscapeDataString(uri);
+            
+            _ = redmineManager.ApiClient.Create(escapedUri,string.Empty, requestOptions);
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="redmineManager"></param>
+        /// <param name="projectIdentifier"></param>
+        /// <param name="repositoryIdentifier"></param>
+        /// <param name="revision"></param>
+        /// <param name="issueIdentifier"></param>
+        /// <param name="requestOptions"></param>
+        public static void ProjectRepositoryRemoveRelatedIssue(this RedmineManager redmineManager, string projectIdentifier, string repositoryIdentifier, string revision, string issueIdentifier, RequestOptions requestOptions = null)
+        {
+            var uri = redmineManager.RedmineApiUrls.ProjectRepositoryRemoveRelatedIssue(projectIdentifier, repositoryIdentifier, revision, issueIdentifier);
+            
+            var escapedUri = Uri.EscapeDataString(uri);
+           
+            _ = redmineManager.ApiClient.Delete(escapedUri, requestOptions);
+        }
+        
+        /// <summary>
         /// 
         /// </summary>
         /// <param name="redmineManager"></param>
@@ -374,6 +473,107 @@ private static NameValueCollection CreateSearchParameters(string q, int limit, i
 
         #if !(NET20)
 
+        /// <summary>
+        /// Archives the project asynchronously
+        /// </summary>
+        /// <param name="redmineManager"></param>
+        /// <param name="projectIdentifier"></param>
+        /// <param name="requestOptions"></param>
+        /// <param name="cancellationToken"></param>
+        public static async Task ArchiveProjectAsync(this RedmineManager redmineManager, string projectIdentifier, RequestOptions requestOptions = null, CancellationToken cancellationToken = default)
+        {
+            var uri = redmineManager.RedmineApiUrls.ProjectArchive(projectIdentifier);
+            
+            var escapedUri = Uri.EscapeDataString(uri);
+           
+            await redmineManager.ApiClient.DeleteAsync(escapedUri,  requestOptions, cancellationToken).ConfigureAwait(false);
+        }
+        
+        /// <summary>
+        /// Unarchives the project asynchronously
+        /// </summary>
+        /// <param name="redmineManager"></param>
+        /// <param name="projectIdentifier"></param>
+        /// <param name="requestOptions"></param>
+        /// <param name="cancellationToken"></param>
+        public static async Task UnarchiveProjectAsync(this RedmineManager redmineManager, string projectIdentifier, RequestOptions requestOptions = null, CancellationToken cancellationToken = default)
+        {
+            var uri = redmineManager.RedmineApiUrls.ProjectUnarchive(projectIdentifier);
+            
+            var escapedUri = Uri.EscapeDataString(uri);
+           
+            await redmineManager.ApiClient.DeleteAsync(escapedUri,  requestOptions, cancellationToken).ConfigureAwait(false);
+        }
+
+        /// <summary>
+        /// Closes the project asynchronously
+        /// </summary>
+        /// <param name="redmineManager"></param>
+        /// <param name="projectIdentifier"></param>
+        /// <param name="requestOptions"></param>
+        /// <param name="cancellationToken"></param>
+        public static async Task CloseProjectAsync(this RedmineManager redmineManager, string projectIdentifier, RequestOptions requestOptions = null, CancellationToken cancellationToken = default)
+        {
+            var uri = redmineManager.RedmineApiUrls.ProjectClose(projectIdentifier);
+            
+            var escapedUri = Uri.EscapeDataString(uri);
+           
+            await redmineManager.ApiClient.UpdateAsync(escapedUri, string.Empty,  requestOptions, cancellationToken).ConfigureAwait(false);
+        }
+
+        /// <summary>
+        /// Reopens the project asynchronously
+        /// </summary>
+        /// <param name="redmineManager"></param>
+        /// <param name="projectIdentifier"></param>
+        /// <param name="requestOptions"></param>
+        /// <param name="cancellationToken"></param>
+        public static async Task ReopenProjectAsync(this RedmineManager redmineManager, string projectIdentifier, RequestOptions requestOptions = null, CancellationToken cancellationToken = default)
+        {
+            var uri = redmineManager.RedmineApiUrls.ProjectReopen(projectIdentifier);
+            
+            var escapedUri = Uri.EscapeDataString(uri);
+           
+            await redmineManager.ApiClient.UpdateAsync(escapedUri, string.Empty, requestOptions, cancellationToken).ConfigureAwait(false);
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="redmineManager"></param>
+        /// <param name="projectIdentifier"></param>
+        /// <param name="repositoryIdentifier"></param>
+        /// <param name="revision"></param>
+        /// <param name="requestOptions"></param>
+        /// <param name="cancellationToken"></param>
+        public static async Task ProjectRepositoryAddRelatedIssueAsync(this RedmineManager redmineManager, string projectIdentifier, string repositoryIdentifier, string revision, RequestOptions requestOptions = null, CancellationToken cancellationToken = default)
+        {
+            var uri = redmineManager.RedmineApiUrls.ProjectRepositoryAddRelatedIssue(projectIdentifier, repositoryIdentifier, revision);
+            
+            var escapedUri = Uri.EscapeDataString(uri);
+           
+            await redmineManager.ApiClient.CreateAsync(escapedUri, string.Empty ,requestOptions, cancellationToken).ConfigureAwait(false);
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="redmineManager"></param>
+        /// <param name="projectIdentifier"></param>
+        /// <param name="repositoryIdentifier"></param>
+        /// <param name="revision"></param>
+        /// <param name="issueIdentifier"></param>
+        /// <param name="requestOptions"></param>
+        /// <param name="cancellationToken"></param>
+        public static async Task ProjectRepositoryRemoveRelatedIssueAsync(this RedmineManager redmineManager, string projectIdentifier, string repositoryIdentifier, string revision, string issueIdentifier, RequestOptions requestOptions = null, CancellationToken cancellationToken = default)
+        {
+            var uri = redmineManager.RedmineApiUrls.ProjectRepositoryRemoveRelatedIssue(projectIdentifier, repositoryIdentifier, revision, issueIdentifier);
+            
+            var escapedUri = Uri.EscapeDataString(uri);
+           
+            await redmineManager.ApiClient.DeleteAsync(escapedUri,  requestOptions, cancellationToken).ConfigureAwait(false);
+        }
+        
         /// <summary>
         /// 
         /// </summary>
diff --git a/src/redmine-net-api/Net/RedmineApiUrlsExtensions.cs b/src/redmine-net-api/Net/RedmineApiUrlsExtensions.cs
index 12f896f9..763060aa 100644
--- a/src/redmine-net-api/Net/RedmineApiUrlsExtensions.cs
+++ b/src/redmine-net-api/Net/RedmineApiUrlsExtensions.cs
@@ -31,6 +31,36 @@ public static string CurrentUser(this RedmineApiUrls redmineApiUrls)
         return $"{RedmineKeys.USERS}/{RedmineKeys.CURRENT}.{redmineApiUrls.Format}";
     }
 
+    public static string ProjectClose(this RedmineApiUrls redmineApiUrls, string projectIdentifier)
+    {
+        return $"{RedmineKeys.PROJECTS}/{projectIdentifier}/{RedmineKeys.CLOSE}.{redmineApiUrls.Format}";
+    }
+    
+    public static string ProjectReopen(this RedmineApiUrls redmineApiUrls, string projectIdentifier)
+    {
+        return $"{RedmineKeys.PROJECTS}/{projectIdentifier}/{RedmineKeys.REOPEN}.{redmineApiUrls.Format}";
+    }
+    
+    public static string ProjectArchive(this RedmineApiUrls redmineApiUrls, string projectIdentifier)
+    {
+        return $"{RedmineKeys.PROJECTS}/{projectIdentifier}/{RedmineKeys.ARCHIVE}.{redmineApiUrls.Format}";
+    }
+    
+    public static string ProjectUnarchive(this RedmineApiUrls redmineApiUrls, string projectIdentifier)
+    {
+        return $"{RedmineKeys.PROJECTS}/{projectIdentifier}/{RedmineKeys.UNARCHIVE}.{redmineApiUrls.Format}";
+    }
+    
+    public static string ProjectRepositoryAddRelatedIssue(this RedmineApiUrls redmineApiUrls, string projectIdentifier, string repositoryIdentifier, string revision)
+    {
+        return $"{RedmineKeys.PROJECTS}/{projectIdentifier}/{RedmineKeys.REPOSITORY}/{repositoryIdentifier}/{RedmineKeys.REVISIONS}/{revision}/{RedmineKeys.ISSUES}.{redmineApiUrls.Format}";
+    }
+    
+    public static string ProjectRepositoryRemoveRelatedIssue(this RedmineApiUrls redmineApiUrls, string projectIdentifier, string repositoryIdentifier, string revision, string issueIdentifier)
+    {
+        return $"{RedmineKeys.PROJECTS}/{projectIdentifier}/{RedmineKeys.REPOSITORY}/{repositoryIdentifier}/{RedmineKeys.REVISIONS}/{revision}/{RedmineKeys.ISSUES}/{issueIdentifier}.{redmineApiUrls.Format}";
+    }
+    
     public static string ProjectNews(this RedmineApiUrls redmineApiUrls, string projectIdentifier)
     {
         if (projectIdentifier.IsNullOrWhiteSpace())
diff --git a/src/redmine-net-api/RedmineKeys.cs b/src/redmine-net-api/RedmineKeys.cs
index 996b7142..5ecae9fd 100644
--- a/src/redmine-net-api/RedmineKeys.cs
+++ b/src/redmine-net-api/RedmineKeys.cs
@@ -116,6 +116,10 @@ public static class RedmineKeys
         /// <summary>
         /// 
         /// </summary>
+        public const string CLOSE = "close";
+        /// <summary>
+        /// 
+        /// </summary>
         public const string CLOSED_ON = "closed_on";
         /// <summary>
         /// 
@@ -636,6 +640,14 @@ public static class RedmineKeys
         /// <summary>
         /// 
         /// </summary>
+        public const string REOPEN = "reopen";
+        /// <summary>
+        /// 
+        /// </summary>
+        public const string REPOSITORY = "repository";
+        /// <summary>
+        /// 
+        /// </summary>
         public const string RESULT = "result";
         /// <summary>
         /// 
@@ -644,6 +656,10 @@ public static class RedmineKeys
         /// <summary>
         /// 
         /// </summary>
+        public const string REVISIONS = "revisions";
+        /// <summary>
+        /// 
+        /// </summary>
         public const string ROLE = "role";
         /// <summary>
         /// 
@@ -789,6 +805,10 @@ public static class RedmineKeys
         /// <summary>
         /// 
         /// </summary>
+        public const string UNARCHIVE = "unarchive";
+        /// <summary>
+        /// 
+        /// </summary>
         public const string UPDATED_ON = "updated_on";
         /// <summary>
         ///