diff --git a/API/Controllers/AgeGroupController.cs b/API/Controllers/AgeGroupController.cs
index 8280bf1..2d9241f 100644
--- a/API/Controllers/AgeGroupController.cs
+++ b/API/Controllers/AgeGroupController.cs
@@ -1,5 +1,5 @@
-using API.Models.Ingoing.Altersgruppen;
-using API.Repository.AgeGroup;
+using API.Models.Internal.Altersgruppen;
+using API.Repository.AgeGroupRepo;
 using Microsoft.AspNetCore.Mvc;
 
 namespace API.Controllers
diff --git a/API/Controllers/AuthController.cs b/API/Controllers/AuthController.cs
index fea2dea..e0458ec 100644
--- a/API/Controllers/AuthController.cs
+++ b/API/Controllers/AuthController.cs
@@ -1,10 +1,16 @@
-using Microsoft.AspNetCore.Mvc;
+using API.Models.Internal.User;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Identity.UI.Services;
+using Microsoft.AspNetCore.Mvc;
 
 namespace API.Controllers;
 
 [ApiController]
 [Route("api/account")]
-public class AuthController : ControllerBase
+public class AuthController(UserManager<User> userManager, SignInManager<User> signInManager, IEmailSender emailSender)
+    : ControllerBase
 {
-
+    private readonly UserManager<User> _userManager = userManager;
+    private readonly SignInManager<User> _signInManager = signInManager;
+    private readonly IEmailSender _emailSender = emailSender;
 }
diff --git a/API/Controllers/RegistrationKeyController.cs b/API/Controllers/RegistrationKeyController.cs
new file mode 100644
index 0000000..330a5c3
--- /dev/null
+++ b/API/Controllers/RegistrationKeyController.cs
@@ -0,0 +1,21 @@
+using API.Repository.RegistrationKeyRepo;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Mvc;
+
+namespace API.Controllers;
+
+[ApiController]
+[Route("api/registrationKey")]
+public class RegistrationKeyController : ControllerBase
+{
+    private IRegistrationKeyService _keyService;
+    private readonly RoleManager<IdentityRole> _roleManager;
+
+    public RegistrationKeyController(IRegistrationKeyService keyService, RoleManager<IdentityRole> roleManager)
+    {
+        _keyService = keyService;
+        _roleManager = roleManager;
+    }
+
+
+}
\ No newline at end of file
diff --git a/API/Database/ApplicationDbContext.cs b/API/Database/ApplicationDbContext.cs
index 029f21e..aaedc61 100644
--- a/API/Database/ApplicationDbContext.cs
+++ b/API/Database/ApplicationDbContext.cs
@@ -12,6 +12,7 @@ namespace API.Database
         }
 
         public DbSet<AltersGruppe> Altersgruppen { get; set; }
+        public DbSet<RegistrationKey> RegistrationKeys { get; set; }
 
         protected override void OnModelCreating(ModelBuilder modelBuilder)
         {
diff --git a/API/Models/Ingoing/Altersgruppen/AltersGruppeIngoing.cs b/API/Models/Ingoing/Altersgruppen/AltersGruppeIngoing.cs
deleted file mode 100644
index d382c45..0000000
--- a/API/Models/Ingoing/Altersgruppen/AltersGruppeIngoing.cs
+++ /dev/null
@@ -1,28 +0,0 @@
-using API.Models.Internal.Altersgruppen;
-using System.ComponentModel.DataAnnotations;
-
-namespace API.Models.Ingoing.Altersgruppen
-{
-    public class AltersGruppeIngoing
-    {
-        [Required]
-        public string Name { get; set; }
-        [Required]
-        public int StartingAge { get; set; }
-        [Required]
-        public int EndingAge { get; set; }
-    }
-
-    public static class AltersgruppeMapper
-    {
-        public static AltersGruppe ToInternalFromIngoing(this AltersGruppeIngoing group)
-        {
-            return new AltersGruppe
-            {
-                Name = group.Name,
-                StartingAge = group.StartingAge,
-                EndingAge = group.EndingAge,
-            };
-        }
-    }
-}
diff --git a/API/Models/Internal/Altersgruppen/AltersGruppe.cs b/API/Models/Internal/Altersgruppen/AltersGruppe.cs
index ad480fc..28b1db5 100644
--- a/API/Models/Internal/Altersgruppen/AltersGruppe.cs
+++ b/API/Models/Internal/Altersgruppen/AltersGruppe.cs
@@ -9,4 +9,27 @@ namespace API.Models.Internal.Altersgruppen
         public int StartingAge { get; set; }
         public int EndingAge { get; set; }
     }
+
+    public class AltersGruppeIngoing
+    {
+        [Required]
+        public string Name { get; set; }
+        [Required]
+        public int StartingAge { get; set; }
+        [Required]
+        public int EndingAge { get; set; }
+    }
+
+    public static class AltersgruppeMapper
+    {
+        public static AltersGruppe ToInternalFromIngoing(this AltersGruppeIngoing group)
+        {
+            return new AltersGruppe
+            {
+                Name = group.Name,
+                StartingAge = group.StartingAge,
+                EndingAge = group.EndingAge,
+            };
+        }
+    }
 }
diff --git a/API/Models/Internal/User/RegistrationKey.cs b/API/Models/Internal/User/RegistrationKey.cs
new file mode 100644
index 0000000..1a6c690
--- /dev/null
+++ b/API/Models/Internal/User/RegistrationKey.cs
@@ -0,0 +1,24 @@
+namespace API.Models.Internal.User;
+
+public class RegistrationKey
+{
+    public string Id { get; set; } = Ulid.NewUlid().ToString();
+    public string? LinkedRole { get; set; }
+    public DateTime Created { get; set; } = DateTime.UtcNow;
+}
+
+public class RegistrationKeyIngoing
+{
+    public string? LinkedRole { get; set; }
+}
+
+public static class RegistrationKeyMapper
+{
+    public static RegistrationKey ToInternalFromIngoing(this RegistrationKeyIngoing key)
+    {
+        return new RegistrationKey
+        {
+            LinkedRole = key.LinkedRole,
+        };
+    }
+}
\ No newline at end of file
diff --git a/API/Program.cs b/API/Program.cs
index f15c0a9..0403ead 100644
--- a/API/Program.cs
+++ b/API/Program.cs
@@ -1,6 +1,6 @@
 using API.Database;
 using API.Models.Internal.User;
-using API.Repository.AgeGroup;
+using API.Repository.AgeGroupRepo;
 using API.Services;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.AspNetCore.Identity.UI.Services;
@@ -27,7 +27,7 @@ builder.Services.AddIdentityCore<User>(options =>
 {
     options.SignIn.RequireConfirmedAccount = true;
     options.User.RequireUniqueEmail = true;
-}).AddEntityFrameworkStores<ApplicationDbContext>().AddDefaultTokenProviders();
+}).AddEntityFrameworkStores<ApplicationDbContext>().AddRoles<IdentityRole>().AddDefaultTokenProviders();
 
 
 // Database
diff --git a/API/Repository/AgeGroup/AgeGroupService.cs b/API/Repository/AgeGroupRepo/AgeGroupService.cs
similarity index 97%
rename from API/Repository/AgeGroup/AgeGroupService.cs
rename to API/Repository/AgeGroupRepo/AgeGroupService.cs
index 3b41cd6..d66249a 100644
--- a/API/Repository/AgeGroup/AgeGroupService.cs
+++ b/API/Repository/AgeGroupRepo/AgeGroupService.cs
@@ -2,7 +2,7 @@
 using API.Models.Internal.Altersgruppen;
 using Microsoft.EntityFrameworkCore;
 
-namespace API.Repository.AgeGroup
+namespace API.Repository.AgeGroupRepo
 {
     public class AgeGroupService : IAgeGroupService
     {
diff --git a/API/Repository/AgeGroup/IAgeGroupService.cs b/API/Repository/AgeGroupRepo/IAgeGroupService.cs
similarity index 91%
rename from API/Repository/AgeGroup/IAgeGroupService.cs
rename to API/Repository/AgeGroupRepo/IAgeGroupService.cs
index 9da50d3..2095cac 100644
--- a/API/Repository/AgeGroup/IAgeGroupService.cs
+++ b/API/Repository/AgeGroupRepo/IAgeGroupService.cs
@@ -1,6 +1,6 @@
 using API.Models.Internal.Altersgruppen;
 
-namespace API.Repository.AgeGroup
+namespace API.Repository.AgeGroupRepo
 {
     public interface IAgeGroupService
     {
diff --git a/API/Repository/RegistrationKeyRepo/IRegistrationKeyService.cs b/API/Repository/RegistrationKeyRepo/IRegistrationKeyService.cs
new file mode 100644
index 0000000..630f33c
--- /dev/null
+++ b/API/Repository/RegistrationKeyRepo/IRegistrationKeyService.cs
@@ -0,0 +1,13 @@
+using API.Models.Internal.User;
+
+namespace API.Repository.RegistrationKeyRepo;
+
+public interface IRegistrationKeyService
+{
+    public Task<List<RegistrationKey>> GetAllAsync();
+    public Task<RegistrationKey?> GetAsync(string id);
+    public Task<RegistrationKey> CreateAsync(RegistrationKeyIngoing key);
+    public Task<RegistrationKey?> DeleteAsync(string id);
+
+    public Task<int> DeleteOldRegistrationKeysAsync(int x);
+}
\ No newline at end of file
diff --git a/API/Repository/RegistrationKeyRepo/RegistrationKeyService.cs b/API/Repository/RegistrationKeyRepo/RegistrationKeyService.cs
new file mode 100644
index 0000000..6babbf5
--- /dev/null
+++ b/API/Repository/RegistrationKeyRepo/RegistrationKeyService.cs
@@ -0,0 +1,76 @@
+using API.Database;
+using API.Models.Internal.User;
+using Microsoft.EntityFrameworkCore;
+
+namespace API.Repository.RegistrationKeyRepo;
+
+public class RegistrationKeyService : IRegistrationKeyService
+{
+    private ApplicationDbContext _context;
+
+    public RegistrationKeyService(ApplicationDbContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<List<RegistrationKey>> GetAllAsync()
+    {
+        var allKeys = await _context.RegistrationKeys.ToListAsync();
+
+        return allKeys;
+    }
+
+    public async Task<RegistrationKey?> GetAsync(string id)
+    {
+        return await _context.RegistrationKeys.FindAsync(id);
+    }
+
+    public async Task<RegistrationKey> CreateAsync(RegistrationKeyIngoing key)
+    {
+        var internalKey = key.ToInternalFromIngoing();
+
+        await _context.RegistrationKeys.AddAsync(internalKey);
+        await _context.SaveChangesAsync();
+
+        return internalKey;
+    }
+
+    public async Task<RegistrationKey?> DeleteAsync(string id)
+    {
+        var key = await _context.RegistrationKeys.FirstOrDefaultAsync(x => x.Id == id);
+
+        if (key == null)
+        {
+            return null;
+        }
+
+        _context.RegistrationKeys.Remove(key);
+        await _context.SaveChangesAsync();
+
+        return key;
+    }
+
+    public async Task<int> DeleteOldRegistrationKeysAsync(int x)
+    {
+        if (x <= 0)
+        {
+            return 0;
+        }
+
+        var cutoff = DateTime.UtcNow.AddDays(-x);
+
+        var oldKeys = await _context.RegistrationKeys
+            .Where(k => k.Created < cutoff)
+            .ToListAsync();
+
+        if (oldKeys.Count == 0)
+        {
+            return 0;
+        }
+
+        _context.RegistrationKeys.RemoveRange(oldKeys);
+        await _context.SaveChangesAsync();
+
+        return oldKeys.Count;
+    }
+}
\ No newline at end of file