diff --git a/Models/Invoice.php b/Models/Invoice.php
index 9832329..f645cf2 100644
--- a/Models/Invoice.php
+++ b/Models/Invoice.php
@@ -27,7 +27,13 @@ use phpOMS\Localization\Money;
  */
 class Invoice implements \JsonSerializable
 {
-    private $id = 0;
+    /**
+     * ID.
+     *
+     * @var   int
+     * @since 1.0.0
+     */
+    protected int $id = 0;
 
     /**
      * Number ID.
@@ -147,6 +153,11 @@ class Invoice implements \JsonSerializable
      */
     private int $reference = 0;
 
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     */
     public function __construct()
     {
         $this->insurance = new Money();
@@ -157,6 +168,13 @@ class Invoice implements \JsonSerializable
         $this->createdAt = new \DateTime();
     }
 
+    /**
+     * Get id.
+     *
+     * @return int Model id
+     *
+     * @since 1.0.0
+     */
     public function getId() : int
     {
         return $this->id;
@@ -192,6 +210,13 @@ class Invoice implements \JsonSerializable
         $this->status = $status;
     }
 
+    /**
+     * Get created at date time
+     *
+     * @return \DateTime
+     *
+     * @since 1.0.0
+     */
     public function getCreatedAt() : \DateTime
     {
         return $this->createdAt;
@@ -207,6 +232,13 @@ class Invoice implements \JsonSerializable
         return $this->send;
     }
 
+    /**
+     * Get created by
+     *
+     * @return int|\phpOMS\Account\Account
+     *
+     * @since 1.0.0
+     */
     public function getCreatedBy() : int
     {
         return $this->createdBy;
diff --git a/Models/InvoiceElement.php b/Models/InvoiceElement.php
index f17d989..08b1700 100644
--- a/Models/InvoiceElement.php
+++ b/Models/InvoiceElement.php
@@ -26,7 +26,13 @@ use phpOMS\Localization\Money;
  */
 class InvoiceElement implements \JsonSerializable
 {
-    private $id = 0;
+    /**
+     * ID.
+     *
+     * @var   int
+     * @since 1.0.0
+     */
+    protected int $id = 0;
 
     private $order = 0;
 
@@ -70,11 +76,23 @@ class InvoiceElement implements \JsonSerializable
 
     private $invoice = 0;
 
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     */
     public function __construct()
     {
 
     }
 
+    /**
+     * Get id.
+     *
+     * @return int Model id
+     *
+     * @since 1.0.0
+     */
     public function getId() : int
     {
         return $this->id;
diff --git a/Theme/Backend/Lang/Navigation.en.lang.php b/Theme/Backend/Lang/Navigation.en.lang.php
index 52f62c7..f789625 100644
--- a/Theme/Backend/Lang/Navigation.en.lang.php
+++ b/Theme/Backend/Lang/Navigation.en.lang.php
@@ -1,4 +1,4 @@
-<?php declare(strict_types=1);
+<?php
 /**
  * Orange Management
  *
@@ -10,6 +10,8 @@
  * @version   1.0.0
  * @link      https://orange-management.org
  */
+declare(strict_types=1);
+
 return ['Navigation' => [
     'Billing' => 'Billing',
 ]];
diff --git a/Theme/Backend/Lang/en.lang.php b/Theme/Backend/Lang/en.lang.php
index 03ece12..e7c2a50 100644
--- a/Theme/Backend/Lang/en.lang.php
+++ b/Theme/Backend/Lang/en.lang.php
@@ -1,4 +1,4 @@
-<?php declare(strict_types=1);
+<?php
 /**
  * Orange Management
  *
@@ -10,6 +10,8 @@
  * @version   1.0.0
  * @link      https://orange-management.org
  */
+declare(strict_types=1);
+
 return ['Billing' => [
     'Address'         => 'Address',
     'Addresses'       => 'Addresses',
diff --git a/Theme/Backend/invoice-archive.tpl.php b/Theme/Backend/invoice-archive.tpl.php
index 145a0f5..52f46d5 100644
--- a/Theme/Backend/invoice-archive.tpl.php
+++ b/Theme/Backend/invoice-archive.tpl.php
@@ -1,4 +1,4 @@
-<?php declare(strict_types=1);
+<?php
 /**
  * Orange Management
  *
@@ -10,6 +10,8 @@
  * @version   1.0.0
  * @link      https://orange-management.org
  */
+declare(strict_types=1);
+
 /**
  * @var \phpOMS\Views\View $this
  */
diff --git a/Theme/Backend/invoice-create.tpl.php b/Theme/Backend/invoice-create.tpl.php
index 6b9d15c..42378b8 100644
--- a/Theme/Backend/invoice-create.tpl.php
+++ b/Theme/Backend/invoice-create.tpl.php
@@ -1,4 +1,4 @@
-<?php declare(strict_types=1);
+<?php
 /**
  * Orange Management
  *
@@ -10,6 +10,8 @@
  * @version   1.0.0
  * @link      https://orange-management.org
  */
+declare(strict_types=1);
+
 /**
  * @var \phpOMS\Views\View $this
  */
diff --git a/Theme/Backend/invoice-list.tpl.php b/Theme/Backend/invoice-list.tpl.php
index 683e4e3..ce0de34 100644
--- a/Theme/Backend/invoice-list.tpl.php
+++ b/Theme/Backend/invoice-list.tpl.php
@@ -1,4 +1,4 @@
-<?php declare(strict_types=1);
+<?php
 /**
  * Orange Management
  *
@@ -10,6 +10,8 @@
  * @version   1.0.0
  * @link      https://orange-management.org
  */
+declare(strict_types=1);
+
 
 $footerView   = new \phpOMS\Views\PaginationView($this->app, $this->request, $this->response);
 $footerView->setTemplate('/Web/Templates/Lists/Footer/PaginationBig');
diff --git a/Theme/Backend/invoice-single.tpl.php b/Theme/Backend/invoice-single.tpl.php
index 145a0f5..52f46d5 100644
--- a/Theme/Backend/invoice-single.tpl.php
+++ b/Theme/Backend/invoice-single.tpl.php
@@ -1,4 +1,4 @@
-<?php declare(strict_types=1);
+<?php
 /**
  * Orange Management
  *
@@ -10,6 +10,8 @@
  * @version   1.0.0
  * @link      https://orange-management.org
  */
+declare(strict_types=1);
+
 /**
  * @var \phpOMS\Views\View $this
  */
diff --git a/Theme/Backend/purchase-invoice-list.tpl.php b/Theme/Backend/purchase-invoice-list.tpl.php
index 9c3d3e7..4a38a94 100644
--- a/Theme/Backend/purchase-invoice-list.tpl.php
+++ b/Theme/Backend/purchase-invoice-list.tpl.php
@@ -1,4 +1,4 @@
-<?php declare(strict_types=1);
+<?php
 /**
  * Orange Management
  *
@@ -10,6 +10,8 @@
  * @version   1.0.0
  * @link      https://orange-management.org
  */
+declare(strict_types=1);
+
 
 $footerView   = new \phpOMS\Views\PaginationView($this->app, $this->request, $this->response);
 $footerView->setTemplate('/Web/Templates/Lists/Footer/PaginationBig');