diff --git a/Modules.Interfaces/GrapQLInterface/LoginData.vb b/Modules.Interfaces/GrapQLInterface/LoginData.vb
new file mode 100644
index 00000000..32ff79d5
--- /dev/null
+++ b/Modules.Interfaces/GrapQLInterface/LoginData.vb
@@ -0,0 +1,4 @@
+Public Class LoginData
+    Public email As String
+    Public token As String
+End Class
diff --git a/Modules.Interfaces/GrapQLInterface/LogoutData.vb b/Modules.Interfaces/GrapQLInterface/LogoutData.vb
new file mode 100644
index 00000000..5dd0e0ff
--- /dev/null
+++ b/Modules.Interfaces/GrapQLInterface/LogoutData.vb
@@ -0,0 +1,3 @@
+Public Class LogoutData
+    Public email As String
+End Class
diff --git a/Modules.Interfaces/GrapQLInterface/QueryData.vb b/Modules.Interfaces/GrapQLInterface/QueryData.vb
new file mode 100644
index 00000000..6081f1c6
--- /dev/null
+++ b/Modules.Interfaces/GrapQLInterface/QueryData.vb
@@ -0,0 +1,5 @@
+Public Class QueryData
+    Public Query As String
+    Public OperationName As String
+    Public Variables As New Object
+End Class
diff --git a/Modules.Interfaces/GraphQLInterface.vb b/Modules.Interfaces/GraphQLInterface.vb
new file mode 100644
index 00000000..8cb39dd9
--- /dev/null
+++ b/Modules.Interfaces/GraphQLInterface.vb
@@ -0,0 +1,119 @@
+Imports System.IO
+Imports System.Net
+Imports System.Security.Cryptography.X509Certificates
+Imports System.Text
+Imports DigitalData.Modules.Logging
+Imports Newtonsoft.Json
+
+Public Class GraphQLInterface
+    Private _logConfig As LogConfig
+    Private _logger As Logger
+    Private _baseUrl As String
+    Private _userEmail As String
+    Private _userPassword As String
+    Private _certificate As X509Certificate
+    Private _cookieJar As CookieContainer
+
+    Private _Encoding As New UTF8Encoding
+
+    Public Sub New(LogConfig As LogConfig, BaseUrl As String, Email As String, Password As String, CertificateFile As String, CertificatePassword As String)
+        Try
+            _logConfig = LogConfig
+            _logger = LogConfig.GetLogger()
+            _baseUrl = BaseUrl
+            _userEmail = Email
+            _userPassword = Password
+
+            _certificate = New X509Certificate(CertificateFile, CertificatePassword)
+        Catch ex As Exception
+            _logger.Error(ex)
+        End Try
+    End Sub
+
+    Public Sub SaveCookies(Cookie As Cookie)
+        GetCookies().Add(Cookie)
+    End Sub
+
+    Public Function Login() As HttpWebResponse
+        Try
+            Dim oLoginData As New LoginData() With {.email = _userEmail, .token = _userPassword}
+            Dim oBytes As Byte() = ToBytes(JsonConvert.SerializeObject(oLoginData))
+            Dim oRequest As HttpWebRequest = GetRequest("/login", oBytes)
+
+            Using oStream = oRequest.GetRequestStream()
+                oStream.Write(oBytes, 0, oBytes.Length)
+            End Using
+
+            Return oRequest.GetResponse()
+        Catch ex As Exception
+            _logger.Error(ex)
+            Throw ex
+        End Try
+    End Function
+
+    Public Function Logout() As HttpWebResponse
+        Try
+            Dim oLogoutData As New LogoutData() With {.email = _userEmail}
+            Dim oBytes As Byte() = ToBytes(JsonConvert.SerializeObject(oLogoutData))
+            Dim oRequest As HttpWebRequest = GetRequest("/logout", oBytes)
+
+            Using stream = oRequest.GetRequestStream()
+                stream.Write(oBytes, 0, oBytes.Length)
+            End Using
+
+            Return oRequest.GetResponse()
+        Catch ex As Exception
+            _logger.Error(ex)
+            Throw ex
+        End Try
+    End Function
+
+    Public Function GetData(Query As String, OperationName As String) As HttpWebResponse
+        Try
+            Dim oQueryData As New QueryData() With {
+                       .OperationName = OperationName,
+                       .Query = Query,
+                       .Variables = New Object
+                   }
+            Dim oBytes = ToBytes(JsonConvert.SerializeObject(oQueryData))
+            Dim oRequest = GetRequest("/graphql", oBytes)
+
+            Using stream = oRequest.GetRequestStream()
+                stream.Write(oBytes, 0, oBytes.Length)
+            End Using
+
+            Return oRequest.GetResponse()
+        Catch ex As Exception
+            _logger.Error(ex)
+            Throw ex
+        End Try
+    End Function
+
+    Private Function GetRequest(Url As String, PostData As Byte()) As HttpWebRequest
+        Try
+            Dim oRequest As HttpWebRequest = WebRequest.Create($"{_baseUrl}{Url}")
+            oRequest.Method = "POST"
+            oRequest.ContentType = "application/json"
+            oRequest.ContentLength = PostData.Length
+            oRequest.ClientCertificates.Add(_certificate)
+            oRequest.CookieContainer = GetCookies()
+
+            Return oRequest
+        Catch ex As Exception
+            _logger.Error(ex)
+            Throw ex
+        End Try
+    End Function
+
+    Private Function GetCookies() As CookieContainer
+        If _cookieJar Is Nothing Then
+            _cookieJar = New CookieContainer()
+        End If
+
+        Return _cookieJar
+    End Function
+
+    Private Function ToBytes(Str As String) As Byte()
+        Return _Encoding.GetBytes(Str)
+    End Function
+End Class
diff --git a/Modules.Interfaces/Interfaces.vbproj b/Modules.Interfaces/Interfaces.vbproj
index 0b79cf85..82c333b1 100644
--- a/Modules.Interfaces/Interfaces.vbproj
+++ b/Modules.Interfaces/Interfaces.vbproj
@@ -44,6 +44,9 @@
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.CSharp" />
+    <Reference Include="Newtonsoft.Json, Version=12.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
+      <HintPath>..\packages\Newtonsoft.Json.12.0.2\lib\net45\Newtonsoft.Json.dll</HintPath>
+    </Reference>
     <Reference Include="NLog, Version=4.0.0.0, Culture=neutral, PublicKeyToken=5120e14c03d0593c, processorArchitecture=MSIL">
       <HintPath>..\packages\NLog.4.6.7\lib\net45\NLog.dll</HintPath>
     </Reference>
@@ -83,6 +86,10 @@
     <Compile Include="ActiveDirectoryInterface\SyncUsers.MSSQL.vb" />
     <Compile Include="ActiveDirectoryInterface\UserEqualityComparer.vb" />
     <Compile Include="ActiveDirectoryInterface\UserPrincipalEx.vb" />
+    <Compile Include="GraphQLInterface.vb" />
+    <Compile Include="GrapQLInterface\LoginData.vb" />
+    <Compile Include="GrapQLInterface\LogoutData.vb" />
+    <Compile Include="GrapQLInterface\QueryData.vb" />
     <Compile Include="ZUGFeRDInterface\Exceptions.vb" />
     <Compile Include="My Project\AssemblyInfo.vb" />
     <Compile Include="My Project\Application.Designer.vb">
@@ -143,5 +150,6 @@
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
   </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.VisualBasic.targets" />
 </Project>
\ No newline at end of file
diff --git a/Modules.Interfaces/packages.config b/Modules.Interfaces/packages.config
index 99e34262..b96ef76e 100644
--- a/Modules.Interfaces/packages.config
+++ b/Modules.Interfaces/packages.config
@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
+  <package id="Newtonsoft.Json" version="12.0.2" targetFramework="net461" />
   <package id="NLog" version="4.6.7" targetFramework="net461" />
 </packages>
\ No newline at end of file