diff --git a/src/Model/Request/SubModel/Head/External/Tracking.php b/src/Model/Request/SubModel/Head/External/Tracking.php
index 0ba6205..369b3b7 100755
--- a/src/Model/Request/SubModel/Head/External/Tracking.php
+++ b/src/Model/Request/SubModel/Head/External/Tracking.php
@@ -14,12 +14,10 @@
 namespace RatePAY\Model\Request\SubModel\Head\External;
 
 use RatePAY\Model\Request\SubModel\AbstractModel;
+use RatePAY\Model\Request\SubModel\Head\External\Tracking\Id;
 
 /**
- * @method $this  setId(string $id)
- * @method string getId()
- * @method $this  setProvider(string $provider)
- * @method string getProvider()
+ * @method Id addId(Id $id)
  */
 class Tracking extends AbstractModel
 {
@@ -43,12 +41,68 @@ class Tracking extends AbstractModel
      */
     public $admittedFields = [
         'Id' => [
+            'mandatory' => true,
+            'multiple' => true,
+            'instanceOf' => 'Head\\External\\Tracking\\Id',
+        ],
+        'Provider' => [
             'mandatory' => false,
-            'cdata' => true,
         ],
-            'Provider' => [
-                'mandatory' => false,
-                'isAttributeTo' => 'Id',
-            ],
     ];
+
+    /**
+     * @return Id[]
+     */
+    public function getIds()
+    {
+        return $this->__get('Id');
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function commonSetter($field, $arguments)
+    {
+        if ($field === 'Id' && $arguments[0] instanceof Tracking\Id === false) {
+            return $this->setId($arguments[0]);
+        }
+        if ($field === 'Provider') {
+            return $this->setProvider($arguments[0]);
+        }
+
+        return parent::commonSetter($field, $arguments);
+    }
+
+    /**
+     * @param $id
+     *
+     * @return Tracking
+     *
+     * @deprecated please use the SubModel "\RatePAY\Model\Request\SubModel\Head\External\Tracking\Id" to set the TrackingId
+     */
+    public function setId($id)
+    {
+        $this->addId((new Id())->setId($id));
+
+        return $this;
+    }
+
+    /**
+     * @param $provider
+     *
+     * @return Tracking
+     *
+     * @deprecated please use the SubModel "\RatePAY\Model\Request\SubModel\Head\External\Tracking\Id" to set the TrackingId
+     */
+    public function setProvider($provider)
+    {
+        $ids = $this->getIds();
+        if (!isset($ids[0]) || $ids[0] === null || count($ids) === 0) {
+            throw new \RuntimeException('please set the Id first');
+        }
+        $id = $ids[count($ids) - 1];
+        $id->setProvider($provider);
+
+        return $this;
+    }
 }
diff --git a/src/Model/Request/SubModel/Head/External/Tracking/Id.php b/src/Model/Request/SubModel/Head/External/Tracking/Id.php
new file mode 100755
index 0000000..54284d8
--- /dev/null
+++ b/src/Model/Request/SubModel/Head/External/Tracking/Id.php
@@ -0,0 +1,63 @@
+<?php
+
+/*
+ * Ratepay PHP-Library
+ *
+ * This document contains trade secret data which are the property of
+ * Ratepay GmbH, Berlin, Germany. Information contained herein must not be used,
+ * copied or disclosed in whole or part unless permitted in writing by Ratepay GmbH.
+ * All rights reserved by Ratepay GmbH.
+ *
+ * Copyright (c) 2019 Ratepay GmbH / Berlin / Germany
+ */
+
+namespace RatePAY\Model\Request\SubModel\Head\External\Tracking;
+
+use RatePAY\Model\Request\SubModel\AbstractModel;
+
+/**
+ * @method string getId()
+ * @method $this  setProvider(string $provider)
+ * @method string getProvider()
+ */
+class Id extends AbstractModel
+{
+    /**
+     * List of admitted fields.
+     * Each field is public accessible by certain getter and setter.
+     * E.g:
+     * Set id by using setId(var). Get id by using getId(). (Please consider the camel case).
+     *
+     * Settings:
+     * mandatory            = field is mandatory (or optional)
+     * mandatoryByRule      = field is mandatory if rule is passed
+     * optionalByRule       = field will only returned if rule is passed
+     * default              = default value if no different value is set
+     * isAttribute          = field is xml attribute to parent object
+     * isAttributeTo        = field is xml attribute to field (in value)
+     * instanceOf           = value has to be an instance of class (in value)
+     * cdata                = value will be wrapped in CDATA tag
+     *
+     * @var array
+     */
+    public $admittedFields = [
+        'Description' => [ // This field will be converted to the inner xml data. this will be identified by the field name "description"
+            'mandatory' => false,
+            'cdata' => true,
+        ],
+        'Provider' => [
+            'mandatory' => false,
+            'isAttribute' => true,
+        ],
+    ];
+
+    /**
+     * @param string $id
+     *
+     * @return Id
+     */
+    public function setId($id)
+    {
+        return $this->__set('Description', $id);
+    }
+}