diff --git a/WEBSERVICES/ZUGFeRDRESTService/Config.cs b/WEBSERVICES/ZUGFeRDRESTService/Config.cs
new file mode 100644
index 00000000..599cc0d6
--- /dev/null
+++ b/WEBSERVICES/ZUGFeRDRESTService/Config.cs
@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace ZUGFeRDRESTService
+{
+    public class Config
+    {
+        public string Name { get; set; }
+        public string LogPath { get; set; }
+
+        public string MSSQLConnectionString { get; set; }
+    }
+}
diff --git a/WEBSERVICES/ZUGFeRDRESTService/Controllers/ValidationController.cs b/WEBSERVICES/ZUGFeRDRESTService/Controllers/ValidationController.cs
new file mode 100644
index 00000000..91ff5730
--- /dev/null
+++ b/WEBSERVICES/ZUGFeRDRESTService/Controllers/ValidationController.cs
@@ -0,0 +1,126 @@
+using System;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Collections.Generic;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Options;
+using DigitalData.Modules.Interfaces;
+using DigitalData.Modules.Logging;
+
+namespace ZUGFeRDRESTService.Controllers
+{    
+    [Route("api/[controller]")]
+    [ApiController]
+    public class ValidationController : ControllerBase
+    {
+        public static string RESPONSE_OK = "OK";
+        public static string RESPONSE_ERROR = "ERROR";
+
+        private readonly ZUGFeRDInterface _zugferd;
+        private readonly IDatabase _database;
+
+        private readonly DigitalData.Modules.Logging.LogConfig _logConfig;
+        private readonly DigitalData.Modules.Logging.Logger _logger;
+
+        private readonly PropertyValues _props;
+        private readonly Dictionary<String, XmlItemProperty> _propertyMap;
+
+        public class ValidationResponse
+        {
+            public string status;
+            public string message;
+            public List<string> errors;
+        
+            public ValidationResponse()
+            {
+                status = RESPONSE_OK;
+                message = String.Empty;
+                errors = new List<string>();
+            }
+        }
+
+        public ValidationController(ILogging logging, IDatabase database)
+        {
+            _logConfig = logging.LogConfig;
+            _logger = _logConfig.GetLogger();
+
+            _logger.Debug("Validation Controller initializing");
+
+            _database = database;
+            var oGDPictureKey = database.GetGDPictureKey();
+            var oPropertyMap = database.GetPropertyMap();
+
+            _propertyMap = oPropertyMap;
+
+            _zugferd = new ZUGFeRDInterface(_logConfig, oGDPictureKey);
+            _props = new PropertyValues(_logConfig);
+
+            _logger.Debug("Validation Controller initialized!");
+        }
+
+        /// <summary>
+        /// POST: api/Validation
+        /// </summary>
+        /// <param name="files">This parameter's name needs to correspond to the html form's file-input name</param>
+        [HttpPost]
+        public async Task<ValidationResponse> Post(IFormFile file, string user_id)
+        {
+            string oFilePath;
+            string oFileName;
+
+            oFilePath = Path.Combine(Path.GetTempPath(), file.FileName);
+            oFileName = file.FileName;
+
+            using FileStream oStream = new FileStream(oFilePath, FileMode.Create);
+            await file.CopyToAsync(oStream);
+
+            CrossIndustryDocumentType oDocument;
+
+            try
+            {
+                oDocument = _zugferd.ExtractZUGFeRDFileWithGDPicture(oFilePath);
+            }
+            catch (Exception ex)
+            {
+                _logger.Error(ex);
+                return new ValidationResponse()
+                {
+                    status = RESPONSE_ERROR,
+                    message = "The uploaded file is not a valid ZUGFeRD Invoice!"
+                };
+            }
+
+            try
+            {
+                PropertyValues.CheckPropertyValuesResult oResult = _props.CheckPropertyValues(oDocument, _propertyMap, "MESSAGEID");
+
+                if (oResult.MissingProperties.Count > 0)
+                {
+                    return new ValidationResponse()
+                    {
+                        status = RESPONSE_ERROR,
+                        message = "The uploaded file is a valid ZUGFeRD Invoice but missing some properties!",
+                        errors = oResult.MissingProperties
+                    };
+                }
+            }
+            catch (Exception ex)
+            {
+                _logger.Error(ex);
+                return new ValidationResponse()
+                {
+                    status = RESPONSE_ERROR,
+                    message = "The uploaded file is not a valid ZUGFeRD Invoice!"
+                };
+            }
+           
+            return new ValidationResponse()
+            {
+                status = RESPONSE_OK,
+                message = "The uploaded files is a valid ZUGFeRD Invoice!"
+            };
+        }
+    }
+}
diff --git a/WEBSERVICES/ZUGFeRDRESTService/Controllers/ZugferdValidationController.cs b/WEBSERVICES/ZUGFeRDRESTService/Controllers/ZugferdValidationController.cs
deleted file mode 100644
index f8d462c3..00000000
--- a/WEBSERVICES/ZUGFeRDRESTService/Controllers/ZugferdValidationController.cs
+++ /dev/null
@@ -1,81 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Threading.Tasks;
-using Microsoft.AspNetCore.Http;
-using Microsoft.AspNetCore.Mvc;
-using System.Text.Json;
-using System.Text.Json.Serialization;
-
-namespace ZUGFeRDRESTService.Controllers
-{    
-    [Route("api/[controller]")]
-    [ApiController]
-    public class ZugferdValidationController : ControllerBase
-    {
-        public static string RESPONSE_OK = "OK";
-        public static string RESPONSE_ERROR = "ERROR";
-
-        private readonly IZugferdValidationDataService _dataService;
-
-        public class ZugferdValidationResponse
-        {
-            public string status;
-            public string message;
-            public List<string> errors;
-
-            
-
-            public ZugferdValidationResponse()
-            {
-                status = RESPONSE_OK;
-                message = String.Empty;
-                errors = new List<string>();
-            }
-        }
-
-        public ZugferdValidationController(IZugferdValidationDataService dataService)
-        {
-            _dataService = dataService;
-        }
-
-        /// <summary>
-        /// POST: api/ZugferdValidation
-        /// </summary>
-        /// <param name="files">This parameter's name needs to correspond to the html form's file-input name</param>
-        [HttpPost]
-        public async Task<ZugferdValidationResponse> Post(List<IFormFile> files)
-        {
-            var oFilePaths = new List<String>();
-            var oFileNames = new List<String>();
-
-            if (files.Count == 0) {
-                return new ZugferdValidationResponse()
-                {
-                    status = RESPONSE_ERROR,
-                    message = "No File received!"
-                };
-            }
-
-            foreach (var formFile in files)
-            {
-                var oFilePath = Path.GetTempFileName();
-                oFilePaths.Add(oFilePath);
-                oFileNames.Add(formFile.FileName);
-
-                using (var oStream = new FileStream(oFilePath, FileMode.Create))
-                {
-                    await formFile.CopyToAsync(oStream);
-                }
-            }
-
-            var oResponse = new ZugferdValidationResponse
-            {
-                message = "You uploaded the following file: " + oFileNames.First()
-            };
-
-            return oResponse;
-        }
-    }
-}
diff --git a/WEBSERVICES/ZUGFeRDRESTService/Database.cs b/WEBSERVICES/ZUGFeRDRESTService/Database.cs
new file mode 100644
index 00000000..c223321c
--- /dev/null
+++ b/WEBSERVICES/ZUGFeRDRESTService/Database.cs
@@ -0,0 +1,64 @@
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using DigitalData.Modules.Database;
+using DigitalData.Modules.Interfaces;
+using Microsoft.Extensions.Configuration;
+
+namespace ZUGFeRDRESTService
+{
+    public class Database: IDatabase
+    {
+        private string _gdPictureKey = null;
+        private Dictionary<String, XmlItemProperty> _propertyMap = null;
+
+        private const string QUERY_GET_GDPICTURE_KEY = "SELECT LICENSE FROM TBDD_3RD_PARTY_MODULES WHERE NAME = 'GDPICTURE'";
+        private const string QUERY_GET_PROPERTY_MAP = "SELECT * FROM TBEDM_XML_ITEMS WHERE SPECIFICATION = '{0}' AND ACTIVE = True ORDER BY XML_PATH";
+
+        public MSSQLServer MSSQL { get; set; }
+        public Firebird Firebird { get; set; }
+
+        public Database(ILogging Logging, IConfiguration Config)
+        {
+            var LogConfig = Logging.LogConfig;
+            var AppConfig = Config.GetSection("Config");
+            var FBConfig = AppConfig.GetSection("Firebird");
+
+            MSSQL = new MSSQLServer(LogConfig, AppConfig["MSSQLConnectionString"]);
+            Firebird = new Firebird(LogConfig, FBConfig["Datasource"], FBConfig["Database"], FBConfig["Username"], FBConfig["Password"]);
+        }
+
+        public string GetGDPictureKey()
+        {
+            if (_gdPictureKey == null)
+                _gdPictureKey = MSSQL.GetScalarValue(QUERY_GET_GDPICTURE_KEY).ToString();
+
+            return _gdPictureKey;
+        }
+
+        public Dictionary<String, XmlItemProperty> GetPropertyMap()
+        {
+            if (_propertyMap == null)
+            {
+                _propertyMap = new Dictionary<string, XmlItemProperty>();
+                var oDatatable = Firebird.GetDatatable(string.Format(QUERY_GET_PROPERTY_MAP, "DEFAULT"));
+
+                foreach (DataRow oRow in oDatatable.Rows)
+                {                
+                    _propertyMap.Add(oRow["XML_PATH"].ToString(), new XmlItemProperty()
+                    { 
+                        Description = oRow["DESCRIPTION"].ToString(),
+                        TableName = oRow["TABLE_NAME"].ToString(),
+                        GroupScope = oRow["GROUP_SCOPE"].ToString(),
+                        IsRequired = (bool)oRow["IS_REQUIRED"],
+                        IsGrouped = (bool)oRow["IS_GROUPED"]
+                    });
+                }
+            }             
+
+            return _propertyMap;
+        }
+    }
+}
diff --git a/WEBSERVICES/ZUGFeRDRESTService/IDatabase.cs b/WEBSERVICES/ZUGFeRDRESTService/IDatabase.cs
new file mode 100644
index 00000000..0cce0b8b
--- /dev/null
+++ b/WEBSERVICES/ZUGFeRDRESTService/IDatabase.cs
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using DigitalData.Modules.Database;
+using DigitalData.Modules.Interfaces;
+
+namespace ZUGFeRDRESTService
+{
+    public interface IDatabase
+    {
+        public MSSQLServer MSSQL { get; set; }
+        public Firebird Firebird { get; set; }
+
+        public string GetGDPictureKey();
+        public Dictionary<String, XmlItemProperty> GetPropertyMap();
+    }
+}
diff --git a/WEBSERVICES/ZUGFeRDRESTService/ILogging.cs b/WEBSERVICES/ZUGFeRDRESTService/ILogging.cs
new file mode 100644
index 00000000..5c31118c
--- /dev/null
+++ b/WEBSERVICES/ZUGFeRDRESTService/ILogging.cs
@@ -0,0 +1,9 @@
+using DigitalData.Modules.Logging;
+
+namespace ZUGFeRDRESTService
+{
+    public interface ILogging
+    {
+        public LogConfig LogConfig { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/WEBSERVICES/ZUGFeRDRESTService/IZugferdValidationDataService.cs b/WEBSERVICES/ZUGFeRDRESTService/IZugferdValidationDataService.cs
deleted file mode 100644
index 181a091a..00000000
--- a/WEBSERVICES/ZUGFeRDRESTService/IZugferdValidationDataService.cs
+++ /dev/null
@@ -1,11 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-
-namespace ZUGFeRDRESTService
-{
-    public interface IZugferdValidationDataService
-    {
-    }
-}
diff --git a/WEBSERVICES/ZUGFeRDRESTService/Logger.cs b/WEBSERVICES/ZUGFeRDRESTService/Logger.cs
new file mode 100644
index 00000000..0f42a78f
--- /dev/null
+++ b/WEBSERVICES/ZUGFeRDRESTService/Logger.cs
@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace ZUGFeRDRESTService
+{
+    public sealed class Logger
+    {
+        private static readonly Lazy<Logger> lazy = new Lazy<Logger>(() => new Logger());
+
+        public static Logger Instance { get { return lazy.Value; } }
+
+        private Logger()
+        {
+
+        }
+    }
+}
+
diff --git a/WEBSERVICES/ZUGFeRDRESTService/Logging.cs b/WEBSERVICES/ZUGFeRDRESTService/Logging.cs
new file mode 100644
index 00000000..6e6a6281
--- /dev/null
+++ b/WEBSERVICES/ZUGFeRDRESTService/Logging.cs
@@ -0,0 +1,15 @@
+using DigitalData.Modules.Logging;
+
+namespace ZUGFeRDRESTService
+{
+    internal class Logging : ILogging
+    {
+        public LogConfig LogConfig { get; set; }
+
+        public Logging(string LogPath, bool Debug)
+        {
+            LogConfig = new LogConfig(LogConfig.PathType.CustomPath, LogPath, null, "Digital Data", "ZUGFeRD-REST-API");
+            LogConfig.Debug = Debug;
+        }        
+    }
+}
\ No newline at end of file
diff --git a/WEBSERVICES/ZUGFeRDRESTService/Pages/Index.cshtml b/WEBSERVICES/ZUGFeRDRESTService/Pages/Index.cshtml
index b5f02066..d941e9ef 100644
--- a/WEBSERVICES/ZUGFeRDRESTService/Pages/Index.cshtml
+++ b/WEBSERVICES/ZUGFeRDRESTService/Pages/Index.cshtml
@@ -3,14 +3,39 @@
     ViewData["Title"] = "UploadTest";
 }
 
-<h1>UploadTest</h1>
+<h1>ZUGFeRD Validation</h1>
 
-<form method="post" action="/api/zugferdvalidation" enctype="multipart/form-data" >
+<form method="post" action="/api/validation" enctype="multipart/form-data" >
     <p>
-        <span>PDF Datei:</span>
-        <input type="file" name="files"  />
+        <label>PDF Datei:</label>
+        <input type="file" name="file" required />
+    </p>
+
+    <p>
+        <label>Benutzerkennung/Email:</label>
+        <input type="email" name="user_id" required />
     </p>
     
     <button type="submit">Submit</button>
 </form>
 
+<style>
+    form {}
+
+    form p {
+        border-bottom: 1px solid grey;
+        padding-bottom: 1rem;
+    }
+
+    form label {
+        display: block;
+        width: 20rem;
+        margin-bottom: 1rem;
+    }
+
+    form input {
+        display: block;
+        width: 20rem;
+    }
+</style>
+
diff --git a/WEBSERVICES/ZUGFeRDRESTService/Program.cs b/WEBSERVICES/ZUGFeRDRESTService/Program.cs
index 5a4e487d..007ffa36 100644
--- a/WEBSERVICES/ZUGFeRDRESTService/Program.cs
+++ b/WEBSERVICES/ZUGFeRDRESTService/Program.cs
@@ -6,6 +6,9 @@ using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
+using NLog.Web;
+using DigitalData.Modules.Logging;
+using System.Reflection;
 
 namespace ZUGFeRDRESTService
 {
diff --git a/WEBSERVICES/ZUGFeRDRESTService/Properties/launchSettings.json b/WEBSERVICES/ZUGFeRDRESTService/Properties/launchSettings.json
index 06475a99..3e1562b7 100644
--- a/WEBSERVICES/ZUGFeRDRESTService/Properties/launchSettings.json
+++ b/WEBSERVICES/ZUGFeRDRESTService/Properties/launchSettings.json
@@ -12,7 +12,7 @@
     "IIS Express": {
       "commandName": "IISExpress",
       "launchBrowser": true,
-      "launchUrl": "api/zugferdvalidation",
+      "launchUrl": "",
       "environmentVariables": {
         "ASPNETCORE_ENVIRONMENT": "Development"
       }
diff --git a/WEBSERVICES/ZUGFeRDRESTService/Startup.cs b/WEBSERVICES/ZUGFeRDRESTService/Startup.cs
index 22e70f10..0a880841 100644
--- a/WEBSERVICES/ZUGFeRDRESTService/Startup.cs
+++ b/WEBSERVICES/ZUGFeRDRESTService/Startup.cs
@@ -18,16 +18,29 @@ namespace ZUGFeRDRESTService
         public Startup(IConfiguration configuration)
         {
             Configuration = configuration;
+            AppConfig = configuration.GetSection("Config");        
         }
 
         public IConfiguration Configuration { get; }
 
+        private IConfigurationSection AppConfig { get; }
+
         // This method gets called by the runtime. Use this method to add services to the container.
         public void ConfigureServices(IServiceCollection services)
         {
+            string oLogPath = AppConfig["LogPath"];
+            bool.TryParse(AppConfig["LogDebug"], out bool oLogDebug);
+
             services.AddControllers().AddNewtonsoftJson();
             services.AddRazorPages();
-            services.AddTransient<IZugferdValidationDataService, ZugferdValidationDataService>();
+            services.Configure<Config>(Configuration.GetSection("Config"));
+            services.AddSingleton<ILogging>(sp => new Logging(oLogPath, oLogDebug));
+            services.AddSingleton((Func<IServiceProvider, IDatabase>)(sp => {
+                var logging = sp.GetService<ILogging>();
+                var config = sp.GetService<IConfiguration>();
+
+                return new Database(logging, config);
+            }));
         }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
diff --git a/WEBSERVICES/ZUGFeRDRESTService/ZUGFeRDRESTService.csproj b/WEBSERVICES/ZUGFeRDRESTService/ZUGFeRDRESTService.csproj
index a7b78335..6450a6f4 100644
--- a/WEBSERVICES/ZUGFeRDRESTService/ZUGFeRDRESTService.csproj
+++ b/WEBSERVICES/ZUGFeRDRESTService/ZUGFeRDRESTService.csproj
@@ -1,12 +1,22 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
+<Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
     <TargetFramework>netcoreapp3.1</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="FirebirdSql.Data.FirebirdClient" Version="7.5.0" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="3.1.2" />
     <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="3.1.1" />
+    <PackageReference Include="NLog" Version="4.6.8" />
+    <PackageReference Include="NLog.Web.AspNetCore" Version="4.9.0" />
+    <PackageReference Include="System.Data.SqlClient" Version="4.8.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\Modules.Database\Database.vbproj" />
+    <ProjectReference Include="..\..\Modules.Interfaces\Interfaces.vbproj" />
+    <ProjectReference Include="..\..\Modules.Logging\Logging.vbproj" />
   </ItemGroup>
 
 
diff --git a/WEBSERVICES/ZUGFeRDRESTService/ZugferdValidationDataService.cs b/WEBSERVICES/ZUGFeRDRESTService/ZugferdValidationDataService.cs
deleted file mode 100644
index 045f481f..00000000
--- a/WEBSERVICES/ZUGFeRDRESTService/ZugferdValidationDataService.cs
+++ /dev/null
@@ -1,11 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-
-namespace ZUGFeRDRESTService
-{
-    public class ZugferdValidationDataService: IZugferdValidationDataService
-    {
-    }
-}
diff --git a/WEBSERVICES/ZUGFeRDRESTService/appsettings.json b/WEBSERVICES/ZUGFeRDRESTService/appsettings.json
index d9d9a9bf..82a76a87 100644
--- a/WEBSERVICES/ZUGFeRDRESTService/appsettings.json
+++ b/WEBSERVICES/ZUGFeRDRESTService/appsettings.json
@@ -6,5 +6,17 @@
       "Microsoft.Hosting.Lifetime": "Information"
     }
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "Config": {
+    "LogPath": "E:\\ZUGFeRDRESTService",
+    "LogDebug": true,
+    "Name": "ZUGFeRD REST API",
+    "MSSQLConnectionString": "Server=SDD-VMP04-SQL17\\DD_DEVELOP01;Database=DD_ECM_TEST;User Id=sa;Password=dd;",
+    "Firebird": {
+      "Datasource": "172.24.12.41",
+      "Database": "172.24.12.41:E:\\DB\\Firebird\\Databases\\EDMI_TEMPLATE\\EDMI_MASTER.FDB",
+      "Username": "SYSDBA",
+      "Password": "dd"
+    }
+  }
 }