diff --git a/LeanderShiftPlannerV2/FileIO/GoogleApiLoader.cs b/LeanderShiftPlannerV2/FileIO/GoogleApiLoader.cs
new file mode 100644
index 0000000..1757cdb
--- /dev/null
+++ b/LeanderShiftPlannerV2/FileIO/GoogleApiLoader.cs
@@ -0,0 +1,54 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using LeanderShiftPlannerV2.Util;
+
+namespace LeanderShiftPlannerV2.FileIO;
+
+public static class GoogleApiLoader
+{
+    public static bool CheckFileSystem()
+    {
+        if (!Directory.Exists(Constants.DataPath))
+            Directory.CreateDirectory(Constants.DataPath);
+        if (!File.Exists(Constants.DataPath + Constants.GoogleApiFilePath))
+        {
+            File.Create(Constants.DataPath + Constants.GoogleApiFilePath).Close();
+            File.WriteAllLines(Constants.DataPath + Constants.GoogleApiFilePath, 
+                File.ReadAllLines(Constants.GoogleApiFileResource));
+            return false;
+        }
+        return true;
+    }
+
+    public static Dictionary<string, string> ReadFile()
+    {
+        if (!CheckFileSystem()) return new  Dictionary<string, string>();
+        Dictionary<string, string> apiSecrets = new Dictionary<string, string>();
+            
+        try
+        {
+            string[] lines = File.ReadAllLines(Constants.DataPath + Constants.GoogleApiFilePath);
+            foreach (string line in lines)
+            {
+                string[] parts = line.Split(new[] { '=' }, 2);
+                if (parts.Length == 2)
+                {
+                    string pattern = parts[0].Trim();
+                    string value = parts[1].Trim();
+                    if (!string.IsNullOrEmpty(pattern))
+                    {
+                        apiSecrets[pattern] = value;
+                    }
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            //TODO
+            Console.WriteLine($"Fehler beim Lesen der Datei: {ex.Message}");
+        }
+
+        return apiSecrets;
+    }
+}
\ No newline at end of file
diff --git a/LeanderShiftPlannerV2/LeanderShiftPlannerV2.csproj b/LeanderShiftPlannerV2/LeanderShiftPlannerV2.csproj
index 788560e..a5adc0f 100644
--- a/LeanderShiftPlannerV2/LeanderShiftPlannerV2.csproj
+++ b/LeanderShiftPlannerV2/LeanderShiftPlannerV2.csproj
@@ -8,10 +8,10 @@
         <ApplicationIcon>Resources/icon/ShiftPlannerIcon.ico</ApplicationIcon>
         <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
         <PackageIcon>Resources\icon\ShiftPlannerIcon.png</PackageIcon>
-        <AssemblyVersion>1.0.4</AssemblyVersion>
-        <FileVersion>1.0.4</FileVersion>
+        <AssemblyVersion>1.0.5</AssemblyVersion>
+        <FileVersion>1.0.5</FileVersion>
         <NeutralLanguage>en</NeutralLanguage>
-        <Version>1.0.1</Version>
+        <Version>1.0.5</Version>
     </PropertyGroup>
 
     <ItemGroup>
@@ -42,6 +42,9 @@
         <EmbeddedResource Include="Resources\templates\timesheet.xlsx">
             <CopyToOutputDirectory>Always</CopyToOutputDirectory>
         </EmbeddedResource>
+        <EmbeddedResource Include="Resources\templates\googleapi.txt">
+            <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+        </EmbeddedResource>
     </ItemGroup>
 
     <ItemGroup>
diff --git a/LeanderShiftPlannerV2/Resources/templates/googleapi.txt b/LeanderShiftPlannerV2/Resources/templates/googleapi.txt
new file mode 100644
index 0000000..7e858d3
--- /dev/null
+++ b/LeanderShiftPlannerV2/Resources/templates/googleapi.txt
@@ -0,0 +1,2 @@
+GoogleClientId=
+GoogleClientSecret=
\ No newline at end of file
diff --git a/LeanderShiftPlannerV2/Service/TimesheetService.cs b/LeanderShiftPlannerV2/Service/TimesheetService.cs
index 39bedb7..479eaf1 100644
--- a/LeanderShiftPlannerV2/Service/TimesheetService.cs
+++ b/LeanderShiftPlannerV2/Service/TimesheetService.cs
@@ -12,6 +12,7 @@ using LeanderShiftPlannerV2.Util;
 using Google.Apis.Auth.OAuth2;
 using Google.Apis.Calendar.v3;
 using Google.Apis.Services;
+using LeanderShiftPlannerV2.FileIO;
 using Newtonsoft.Json.Linq;
 
 namespace LeanderShiftPlannerV2.Service;
@@ -21,8 +22,6 @@ public class TimesheetService
     private readonly AppService _appService;
     private const string HolidayApiUriPart1 = "https://feiertage-api.de/api/?jahr=";
     private const string HolidayApiUriPart2 = "&nur_land=";
-    private const string GoogleClientId = "823920428427-ub5n9a9dkfpuvjlut4eneg2058so49o3.apps.googleusercontent.com";
-    private const string GoogleClientSecret = "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";
 
     public TimesheetService(AppService appService)
     {
@@ -34,9 +33,18 @@ public class TimesheetService
         string[] scopes = { CalendarService.Scope.CalendarReadonly };
         const string applicationName = "LeanderShiftPlanner";
 
+        Dictionary<string, string> secrets = GoogleApiLoader.ReadFile();
+
+        if (!secrets.ContainsKey(Constants.GoogleClientId) || !secrets.ContainsKey(Constants.GoogleClientSecret))
+            return;
+        if (secrets[Constants.GoogleClientId].Equals(string.Empty) || secrets[Constants.GoogleClientSecret].Equals(string.Empty))
+            return;
+        
         ClientSecrets clientSecrets = new ClientSecrets();
-        clientSecrets.ClientId = GoogleClientId;
-        clientSecrets.ClientSecret = GoogleClientSecret;
+        clientSecrets.ClientId = secrets[Constants.GoogleClientId];
+        clientSecrets.ClientSecret = secrets[Constants.GoogleClientSecret];
+        //clientSecrets.ClientId = "823920428427-ub5n9a9dkfpuvjlut4eneg2058so49o3.apps.googleusercontent.com";
+        //clientSecrets.ClientSecret = "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";
         UserCredential credential = await GoogleWebAuthorizationBroker.AuthorizeAsync(clientSecrets, scopes, "user", CancellationToken.None);
             
         // Erstelle den CalendarService
diff --git a/LeanderShiftPlannerV2/Util/Constants.cs b/LeanderShiftPlannerV2/Util/Constants.cs
index 0158daa..f2730fa 100644
--- a/LeanderShiftPlannerV2/Util/Constants.cs
+++ b/LeanderShiftPlannerV2/Util/Constants.cs
@@ -17,6 +17,10 @@ namespace LeanderShiftPlannerV2.Util
         public const string FontPath = @"Resources/font/";
         public const string FontEmblem = "Emblem.ttf";
         public const string FontRoboto = "Roboto.ttf";
+        public const string GoogleApiFilePath = @"/googleapi.txt";
+        public const string GoogleClientId = "GoogleClientId";
+        public const string GoogleClientSecret = "GoogleClientSecret";
+        public const string GoogleApiFileResource = @"Resources/templates/googleapi.txt";
         
         // TimeSheets
         public static readonly string TimeSheetSourceRandom = "Random";
diff --git a/LeanderShiftPlannerV2/View/LeanderShiftPlannerView/LeanderShiftPlannerMainWindow.axaml.cs b/LeanderShiftPlannerV2/View/LeanderShiftPlannerView/LeanderShiftPlannerMainWindow.axaml.cs
index c362b6f..31044b8 100644
--- a/LeanderShiftPlannerV2/View/LeanderShiftPlannerView/LeanderShiftPlannerMainWindow.axaml.cs
+++ b/LeanderShiftPlannerV2/View/LeanderShiftPlannerView/LeanderShiftPlannerMainWindow.axaml.cs
@@ -31,6 +31,7 @@ public partial class LeanderShiftPlannerMainWindow : Window
         InitializeComponent();
 
         LoadData();
+        CreateApiFile();
 
         DeactivateView();
         ViewModePersons();
@@ -44,6 +45,11 @@ public partial class LeanderShiftPlannerMainWindow : Window
         _appService.FilterService.Filters.CollectionChanged += FilterListChanged;
     }
 
+    private void CreateApiFile()
+    {
+        GoogleApiLoader.CheckFileSystem();
+    }
+
     // ------------------------------------------------------UI-Interactions------------------------------------------------------
 
     private void ButtonAddPerson_Click(object? sender, RoutedEventArgs e)