diff --git a/Habitica.Todoist.Integration.Function.Sync/HttpSyncFunction.cs b/Habitica.Todoist.Integration.Function.Sync/HttpSyncFunction.cs
index a9af22e..78c70d8 100644
--- a/Habitica.Todoist.Integration.Function.Sync/HttpSyncFunction.cs
+++ b/Habitica.Todoist.Integration.Function.Sync/HttpSyncFunction.cs
@@ -1,16 +1,20 @@
 using System;
 using System.IO;
+using System.Linq;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Mvc;
+using Habitica.Todoist.Integration.Data;
+using Habitica.Todoist.Integration.Model.Habitica.Enums;
+using Habitica.Todoist.Integration.Model.Storage;
+using Habitica.Todoist.Integration.Model.Todoist;
+using Habitica.Todoist.Integration.Services;
 using Microsoft.Azure.WebJobs;
+using Microsoft.Azure.WebJobs.Host;
 using Microsoft.Azure.WebJobs.Extensions.Http;
 using Microsoft.AspNetCore.Http;
-using Microsoft.Extensions.Logging;
-using Newtonsoft.Json;
+using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Configuration;
-using Habitica.Todoist.Integration.Model.Todoist;
+using Microsoft.Extensions.Logging;
 using HabiticaTask = Habitica.Todoist.Integration.Model.Habitica.Task;
-using Habitica.Todoist.Integration.Model.Habitica.Enums;
 
 namespace Habitica.Todoist.Integration.Function.Sync
 {
@@ -18,10 +22,61 @@ namespace Habitica.Todoist.Integration.Function.Sync
     {
         public static Configuration HttpConfiguration { get; set; } = new Configuration();
 
+        [Singleton("SyncLock", SingletonScope.Host)]
         [FunctionName("HttpSyncFunction")]
         public static async Task<IActionResult> Run([HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req, ILogger log)
         {
-            return new OkObjectResult("TEST");
+            // initialize all the clients 
+            var habiticaClient = new HabiticaServiceClient(HttpConfiguration.HabiticaUserId, HttpConfiguration.HabiticaApiKey);
+            var todoistClient = new TodoistServiceClient(HttpConfiguration.TodoistApiKey);
+            var storageClient = new TableStorageClient(HttpConfiguration.TableStorageConnectionString);
+
+            // initialize integration services
+            var todoistIntegration = new TodoistIntegrationService(todoistClient, storageClient, HttpConfiguration.GiosUserId);
+            var giosUserId = HttpConfiguration.GiosUserId;
+
+            // get all changed items from todoist
+            var items = await todoistIntegration.ReadItemChanges();
+
+            // perform actions
+            foreach (var addedItem in items.WhereAdded())
+            {
+                var task = (await habiticaClient.CreateTask(TaskFromTodoistItem(addedItem))).Data;
+                var link = new TodoHabitLink(giosUserId, addedItem.Id, task.Id);
+
+                await storageClient.InsertOrUpdate(link);
+                await storageClient.InsertOrUpdate(link.Reverse());
+            }
+
+            foreach (var updatedItem in items.WhereUpdated())
+            {
+                var habiticaId = storageClient.Query<TodoHabitLink>()
+                    .Where(x => x.PartitionKey == giosUserId && x.RowKey == updatedItem.Id)
+                    .ToList().First().HabiticaId;
+                await habiticaClient.UpdateTask(TaskFromTodoistItem(updatedItem, habiticaId));
+            }
+
+            foreach (var completedItem in items.WhereCompleted())
+            {
+                var habiticaId = storageClient.Query<TodoHabitLink>()
+                    .Where(x => x.PartitionKey == giosUserId && x.RowKey == completedItem.Id)
+                    .ToList().First().HabiticaId;
+                await habiticaClient.ScoreTask(habiticaId, ScoreAction.Up);
+            }
+
+            foreach (var deleteItem in items.WhereDeleted())
+            {
+                var habiticaId = storageClient.Query<TodoHabitLink>()
+                    .Where(x => x.PartitionKey == giosUserId && x.RowKey == deleteItem.Id)
+                    .ToList().First().HabiticaId;
+                await habiticaClient.DeleteTask(habiticaId);
+            }
+
+            // commit read changes
+            await todoistIntegration.CommitRead();
+
+            // return success
+            return new OkResult();
         }
 
         private static string GetHabiticaDifficulty(int todoistDifficulty)
diff --git a/Habitica.Todoist.Integration.Function.Sync/ScheduledSyncFunction.cs b/Habitica.Todoist.Integration.Function.Sync/ScheduledSyncFunction.cs
index 2041757..0fe431c 100644
--- a/Habitica.Todoist.Integration.Function.Sync/ScheduledSyncFunction.cs
+++ b/Habitica.Todoist.Integration.Function.Sync/ScheduledSyncFunction.cs
@@ -19,9 +19,9 @@ namespace Habitica.Todoist.Integration.Function.Sync
     {
         public static Configuration ScheduledConfiguration { get; set; } = new Configuration();
 
-        [Singleton]
+        [Singleton("SyncLock", SingletonScope.Host)]
         [FunctionName("ScheduledSyncFunction")]
-        public static async Task Run([TimerTrigger("0 */1 * * * *")]TimerInfo myTimer, ILogger log)
+        public static async Task Run([TimerTrigger("0 0 * * * *")]TimerInfo myTimer, ILogger log)
         {
             // initialize all the clients 
             var habiticaClient = new HabiticaServiceClient(ScheduledConfiguration.HabiticaUserId, ScheduledConfiguration.HabiticaApiKey);