diff --git a/Admin/Installer.php b/Admin/Installer.php
index d51c398..f4a65df 100644
--- a/Admin/Installer.php
+++ b/Admin/Installer.php
@@ -72,7 +72,7 @@ class Installer extends InstallerAbstract
                             `billing_invoice_taxid` varchar(255) DEFAULT NULL,
                             `billing_invoice_freightage` int(11) DEFAULT NULL,
                             `billing_invoice_insurance` int(11) DEFAULT NULL,
-                            
+
                             `billing_invoice_referer` int(11) DEFAULT NULL,
                             `billing_invoice_referer_name` int(11) DEFAULT NULL,
 
diff --git a/Models/Invoice.php b/Models/Invoice.php
index b467f85..4b8c0e9 100644
--- a/Models/Invoice.php
+++ b/Models/Invoice.php
@@ -96,7 +96,7 @@ class Invoice implements \JsonSerializable
     private $billZip = '';
 
     private $billCountry = '';
-    
+
     /**
      * Person refering for this order.
      *
@@ -118,7 +118,7 @@ class Invoice implements \JsonSerializable
     private $gross = null;
 
     private $currency = ISO4217CharEnum::_EUR;
-    
+
     private $info = '';
 
     private $payment = 0;
@@ -355,7 +355,7 @@ class Invoice implements \JsonSerializable
     {
         return $this->referer;
     }
-    
+
     public function setRefererName(string $refererName) /* : void */
     {
         $this->refererName = $refererName;
@@ -455,7 +455,7 @@ class Invoice implements \JsonSerializable
     {
         return $this->terms;
     }
-    
+
     public function setTermsText(string $terms) /* : void */
     {
         $this->termsText = $terms;
@@ -471,7 +471,7 @@ class Invoice implements \JsonSerializable
         $this->shipping = $shipping;
     }
 
-    public function getShipping() 
+    public function getShipping()
     {
         return $this->shipping;
     }
@@ -485,7 +485,7 @@ class Invoice implements \JsonSerializable
     {
         return $this->shippingText;
     }
-    
+
     public function getVouchers() : array
     {
         return $this->vouchers;
@@ -518,6 +518,6 @@ class Invoice implements \JsonSerializable
 
     public function jsonSerialize()
     {
-        
+
     }
 }
\ No newline at end of file
diff --git a/Models/InvoiceElement.php b/Models/InvoiceElement.php
index 7a2ee4b..d06fd7d 100644
--- a/Models/InvoiceElement.php
+++ b/Models/InvoiceElement.php
@@ -33,7 +33,7 @@ class InvoiceElement implements \JsonSerializable
     private $itemName = '';
 
     private $itemDescription = '';
-    
+
     private $quantity = 0;
 
     private $singlePrice = null;
@@ -49,7 +49,7 @@ class InvoiceElement implements \JsonSerializable
     private $totalDiscountR = null;
 
     private $discountQ = 0;
-    
+
     private $singlePriceNet = null;
 
     private $totalPriceNet = null;
@@ -93,7 +93,7 @@ class InvoiceElement implements \JsonSerializable
         $this->promotion = $promotion;
     }
 
-    public function getPromotion() 
+    public function getPromotion()
     {
         return $this->promotion;
     }
@@ -208,7 +208,7 @@ class InvoiceElement implements \JsonSerializable
         $this->discountQ = $quantity;
     }
 
-    public function getDiscountQuantity() 
+    public function getDiscountQuantity()
     {
         return $this->discountQ;
     }
@@ -275,6 +275,6 @@ class InvoiceElement implements \JsonSerializable
 
     public function jsonSerialize()
     {
-        
+
     }
 }
\ No newline at end of file
diff --git a/Theme/Backend/invoice-archive.tpl.php b/Theme/Backend/invoice-archive.tpl.php
index 74763f2..e3c82b3 100644
--- a/Theme/Backend/invoice-archive.tpl.php
+++ b/Theme/Backend/invoice-archive.tpl.php
@@ -13,4 +13,4 @@
 /**
  * @var \phpOMS\Views\View $this
  */
-echo $this->getData('nav')->render(); 
+echo $this->getData('nav')->render();
diff --git a/Theme/Backend/invoice-single.tpl.php b/Theme/Backend/invoice-single.tpl.php
index 74763f2..e3c82b3 100644
--- a/Theme/Backend/invoice-single.tpl.php
+++ b/Theme/Backend/invoice-single.tpl.php
@@ -13,4 +13,4 @@
 /**
  * @var \phpOMS\Views\View $this
  */
-echo $this->getData('nav')->render(); 
+echo $this->getData('nav')->render();