Basic DHL implementation, Refactor redundant code

classes/Modules/ShippingMethod/Model/CustomsInfo.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Xentral\Modules\ShippingMethod\Model;
+
+class CustomsInfo
+{
+  const CUSTOMS_TYPE_GIFT = 0;
+  const CUSTOMS_TYPE_DOCUMENTS = 1;
+  const CUSTOMS_TYPE_GOODS = 2;
+  const CUSTOMS_TYPE_SAMPLE = 3;
+  const CUSTOMS_TYPE_RETURN = 4;
+
+}