diff --git a/src/Payment/Saferpay/Data/PayInitParameter.php b/src/Payment/Saferpay/Data/PayInitParameter.php
index 65fd11a..743cb5d 100644
--- a/src/Payment/Saferpay/Data/PayInitParameter.php
+++ b/src/Payment/Saferpay/Data/PayInitParameter.php
@@ -44,6 +44,25 @@ public function getAmount()
         return $this->get('AMOUNT');
     }
 
+    /**
+     * @param string $cssurl
+     * @return $this
+     */
+    public function setCssurl($cssurl)
+    {
+        $this->set('CSSURL', $cssurl);
+
+        return $this;
+    }
+
+    /**
+     * @return string
+     */
+    public function getCssurl()
+    {
+        return $this->get('CSSURL');
+    }
+
     /**
      * @param string $currency
      * @return $this
@@ -649,6 +668,7 @@ public function getFieldNames()
         return array(
             'ACCOUNTID',
             'AMOUNT',
+            'CSSURL',
             'CURRENCY',
             'DESCRIPTION',
             'ORDERID',
diff --git a/src/Payment/Saferpay/Data/PayInitParameterInterface.php b/src/Payment/Saferpay/Data/PayInitParameterInterface.php
index a17548c..2f8d1f5 100644
--- a/src/Payment/Saferpay/Data/PayInitParameterInterface.php
+++ b/src/Payment/Saferpay/Data/PayInitParameterInterface.php
@@ -23,6 +23,11 @@ interface PayInitParameterInterface
      */
     const AMOUNT = 'n[..8]';
 
+    /**
+     * URL to custom url file
+     */
+    const CSSURL = 'ans[..50]';
+
     /**
      * Three-digit ISO 4217 currency code.
      * For example, "CHF" or "EUR"
@@ -353,6 +358,17 @@ public function setAutoclose($autoclose);
      */
     public function getAutoclose();
 
+    /**
+     * @param string $cssurl
+     * @return $this
+     */
+    public function setCssurl($cssurl);
+
+    /**
+     * @return string
+     */
+    public function getCssurl();
+
     /**
      * @param string $ccname
      * @return $this