diff --git a/Webshop.Api/Controllers/Public/ProductsController.cs b/Webshop.Api/Controllers/Public/ProductsController.cs
index 77316a9..a546f5b 100644
--- a/Webshop.Api/Controllers/Public/ProductsController.cs
+++ b/Webshop.Api/Controllers/Public/ProductsController.cs
@@ -4,16 +4,17 @@ using Microsoft.AspNetCore.Authorization;
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using Webshop.Application.DTOs.Products;
-using Webshop.Application.Services.Public.Interfaces; // <-- WICHTIGES USING HINZUFÜGEN
+using Webshop.Application.Services.Public.Interfaces;
+using Microsoft.AspNetCore.Http;
+using Webshop.Application;
 
 namespace Webshop.Api.Controllers.Public
 {
     [ApiController]
-    [Route("api/v1/public/[controller]")] // Route explizit gemacht für Klarheit
+    [Route("api/v1/public/[controller]")]
     [AllowAnonymous]
     public class ProductsController : ControllerBase
     {
-        // --- KORREKTUR: Abhängigkeit vom Interface, nicht von der Klasse ---
         private readonly IProductService _productService;
 
         public ProductsController(IProductService productService)
@@ -21,43 +22,35 @@ namespace Webshop.Api.Controllers.Public
             _productService = productService;
         }
 
-        /// <summary>
-        /// Ruft eine Liste aller öffentlichen, aktiven Produkte ab.
-        /// </summary>
         [HttpGet]
-        [ProducesResponseType(typeof(IEnumerable<ProductDto>), 200)]
-        public async Task<ActionResult<IEnumerable<ProductDto>>> GetAllProducts()
+        [ProducesResponseType(typeof(IEnumerable<ProductDto>), StatusCodes.Status200OK)]
+        public async Task<IActionResult> GetAllProducts()
         {
-            var products = await _productService.GetAllProductsAsync();
-            return Ok(products);
+            var result = await _productService.GetAllProductsAsync();
+            return Ok(result.Value);
         }
 
-        /// <summary>
-        /// Ruft ein einzelnes öffentliches Produkt anhand seines URL-Slugs ab.
-        /// </summary>
-        [HttpGet("{slug}")] // Ergibt die Route z.B. /api/v1/public/products/mein-produkt-slug
-        [ProducesResponseType(typeof(ProductDto), 200)]
-        [ProducesResponseType(404)] // Not Found
-        public async Task<ActionResult<ProductDto>> GetProductBySlug(string slug)
+        [HttpGet("{slug}")]
+        [ProducesResponseType(typeof(ProductDto), StatusCodes.Status200OK)]
+        [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status404NotFound)]
+        public async Task<IActionResult> GetProductBySlug(string slug)
         {
-            var product = await _productService.GetProductBySlugAsync(slug);
+            var result = await _productService.GetProductBySlugAsync(slug);
 
-            if (product == null)
+            return result.Type switch
             {
-                return NotFound();
-            }
-
-            return Ok(product);
+                ServiceResultType.Success => Ok(result.Value),
+                ServiceResultType.NotFound => NotFound(new { Message = result.ErrorMessage }),
+                _ => StatusCode(StatusCodes.Status500InternalServerError, "Ein unerwarteter Fehler ist aufgetreten.")
+            };
         }
-        /// <summary>
-        /// Ruft eine Liste der Sonderangebote für die Startseite ab, sortiert nach Anzeigereihenfolge.
-        /// </summary>
+
         [HttpGet("featured")]
-        [ProducesResponseType(typeof(IEnumerable<ProductDto>), 200)]
-        public async Task<ActionResult<IEnumerable<ProductDto>>> GetFeaturedProducts()
+        [ProducesResponseType(typeof(IEnumerable<ProductDto>), StatusCodes.Status200OK)]
+        public async Task<IActionResult> GetFeaturedProducts()
         {
-            var products = await _productService.GetFeaturedProductsAsync();
-            return Ok(products);
+            var result = await _productService.GetFeaturedProductsAsync();
+            return Ok(result.Value);
         }
     }
 }
\ No newline at end of file
diff --git a/Webshop.Application/DTOs/Products/ProductDto.cs b/Webshop.Application/DTOs/Products/ProductDto.cs
index 6baa677..5494259 100644
--- a/Webshop.Application/DTOs/Products/ProductDto.cs
+++ b/Webshop.Application/DTOs/Products/ProductDto.cs
@@ -12,6 +12,7 @@ namespace Webshop.Application.DTOs.Products
         public string Description { get; set; } = string.Empty;
         public string SKU { get; set; } = string.Empty;
         public decimal Price { get; set; }
+        public decimal? OldPrice { get; set; }
         public bool IsActive { get; set; }
         public bool IsInStock { get; set; }
         public int StockQuantity { get; set; }
diff --git a/Webshop.Application/Services/Public/Interfaces/IProductService.cs b/Webshop.Application/Services/Public/Interfaces/IProductService.cs
index 035509b..6ecf3e4 100644
--- a/Webshop.Application/Services/Public/Interfaces/IProductService.cs
+++ b/Webshop.Application/Services/Public/Interfaces/IProductService.cs
@@ -1,15 +1,15 @@
-// RICHTIG - vollständig
+// src/Webshop.Application/Services/Public/Interfaces/IProductService.cs
 using System.Collections.Generic;
 using System.Threading.Tasks;
+using Webshop.Application;
 using Webshop.Application.DTOs.Products;
 
 namespace Webshop.Application.Services.Public.Interfaces
 {
     public interface IProductService
     {
-        Task<IEnumerable<ProductDto>> GetAllProductsAsync();
-
-        Task<ProductDto?> GetProductBySlugAsync(string slug);
-        Task<IEnumerable<ProductDto>> GetFeaturedProductsAsync(); // << NEU >>
+        Task<ServiceResult<IEnumerable<ProductDto>>> GetAllProductsAsync();
+        Task<ServiceResult<ProductDto>> GetProductBySlugAsync(string slug);
+        Task<ServiceResult<IEnumerable<ProductDto>>> GetFeaturedProductsAsync();
     }
 }
\ No newline at end of file
diff --git a/Webshop.Application/Services/Public/ProductService.cs b/Webshop.Application/Services/Public/ProductService.cs
index cc0de72..a745af1 100644
--- a/Webshop.Application/Services/Public/ProductService.cs
+++ b/Webshop.Application/Services/Public/ProductService.cs
@@ -3,10 +3,11 @@ using Microsoft.EntityFrameworkCore;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
+using Webshop.Application;
 using Webshop.Application.DTOs.Categorie;
 using Webshop.Application.DTOs.Products;
 using Webshop.Application.Services.Public.Interfaces;
-using Webshop.Domain.Interfaces;
+using Webshop.Domain.Entities;
 using Webshop.Infrastructure.Data;
 
 namespace Webshop.Application.Services.Public
@@ -20,77 +21,34 @@ namespace Webshop.Application.Services.Public
             _context = context;
         }
 
-        public async Task<IEnumerable<ProductDto>> GetAllProductsAsync()
+        public async Task<ServiceResult<IEnumerable<ProductDto>>> GetAllProductsAsync()
         {
             var products = await _context.Products
                 .Include(p => p.Productcategories).ThenInclude(pc => pc.categorie)
-                .Include(p => p.Images) // Lade Bilder mit
+                .Include(p => p.Images)
                 .Where(p => p.IsActive)
                 .ToListAsync();
 
-            return products.Select(p => new ProductDto
-            {
-                Id = p.Id,
-                Name = p.Name,
-                Description = p.ShortDescription,
-                Price = p.Price,
-                SKU = p.SKU,
-                IsInStock = p.IsInStock,
-                Slug = p.Slug,
-                categories = p.Productcategories.Select(pc => new CategorieDto
-                {
-                    Id = pc.categorie.Id,
-                    Name = pc.categorie.Name,
-                    Slug = pc.categorie.Slug
-                }).ToList(),
-                Images = p.Images.Select(img => new ProductImageDto
-                {
-                    Id = img.Id,
-                    Url = img.Url,
-                    IsMainImage = img.IsMainImage,
-                    DisplayOrder = img.DisplayOrder
-                }).ToList()
-            }).ToList();
+            var dtos = products.Select(p => MapToDto(p, useShortDescription: true)).ToList();
+            return ServiceResult.Ok<IEnumerable<ProductDto>>(dtos);
         }
 
-        public async Task<ProductDto?> GetProductBySlugAsync(string slug)
+        public async Task<ServiceResult<ProductDto>> GetProductBySlugAsync(string slug)
         {
             var product = await _context.Products
                 .Include(p => p.Productcategories).ThenInclude(pc => pc.categorie)
-                .Include(p => p.Images) // Lade Bilder mit
+                .Include(p => p.Images)
                 .FirstOrDefaultAsync(p => p.Slug == slug && p.IsActive);
 
             if (product == null)
             {
-                return null;
+                return ServiceResult.Fail<ProductDto>(ServiceResultType.NotFound, $"Produkt mit dem Slug '{slug}' wurde nicht gefunden.");
             }
 
-            return new ProductDto
-            {
-                Id = product.Id,
-                Name = product.Name,
-                Description = product.Description,
-                Price = product.Price,
-                SKU = product.SKU,
-                IsInStock = product.IsInStock,
-                Slug = product.Slug,
-                categories = product.Productcategories.Select(pc => new CategorieDto
-                {
-                    Id = pc.categorie.Id,
-                    Name = pc.categorie.Name,
-                    Slug = pc.categorie.Slug
-                }).ToList(),
-                Images = product.Images.Select(img => new ProductImageDto
-                {
-                    Id = img.Id,
-                    Url = img.Url,
-                    IsMainImage = img.IsMainImage,
-                    DisplayOrder = img.DisplayOrder
-                }).ToList()
-            };
+            return ServiceResult.Ok(MapToDto(product, useShortDescription: false));
         }
 
-        public async Task<IEnumerable<ProductDto>> GetFeaturedProductsAsync()
+        public async Task<ServiceResult<IEnumerable<ProductDto>>> GetFeaturedProductsAsync()
         {
             var products = await _context.Products
                 .Where(p => p.IsActive && p.IsFeatured)
@@ -99,32 +57,38 @@ namespace Webshop.Application.Services.Public
                 .Include(p => p.Productcategories).ThenInclude(pc => pc.categorie)
                 .ToListAsync();
 
-            return products.Select(p => new ProductDto
+            var dtos = products.Select(p => MapToDto(p, useShortDescription: true)).ToList();
+            return ServiceResult.Ok<IEnumerable<ProductDto>>(dtos);
+        }
+
+        // Private Hilfsmethode, um Codeduplizierung zu vermeiden
+        private ProductDto MapToDto(Product product, bool useShortDescription)
+        {
+            return new ProductDto
             {
-                Id = p.Id,
-                Name = p.Name,
-                Description = p.ShortDescription, // Für die Startseite ist die Kurzbeschreibung ideal
-                SKU = p.SKU,
-                Price = p.Price,
-                IsActive = p.IsActive,
-                IsInStock = p.IsInStock,
-                StockQuantity = p.StockQuantity,
-                Slug = p.Slug,
-                categories = p.Productcategories.Select(pc => new CategorieDto
+                Id = product.Id,
+                Name = product.Name,
+                Description = useShortDescription ? product.ShortDescription : product.Description,
+                Price = product.Price,
+                OldPrice = product.OldPrice,
+                SKU = product.SKU,
+                IsInStock = product.IsInStock,
+                StockQuantity = product.StockQuantity,
+                Slug = product.Slug,
+                categories = product.Productcategories.Select(pc => new CategorieDto
                 {
                     Id = pc.categorie.Id,
                     Name = pc.categorie.Name,
                     Slug = pc.categorie.Slug
                 }).ToList(),
-                Images = p.Images.OrderBy(i => i.DisplayOrder).Select(img => new ProductImageDto
+                Images = product.Images.OrderBy(i => i.DisplayOrder).Select(img => new ProductImageDto
                 {
                     Id = img.Id,
                     Url = img.Url,
                     IsMainImage = img.IsMainImage,
                     DisplayOrder = img.DisplayOrder
                 }).ToList()
-            }).ToList();
+            };
         }
-
     }
 }
\ No newline at end of file