Add item_oxid parameter to all event templates

views/smarty/event/begin_checkout.tpl

@@ -25,6 +25,7 @@
             [{assign var="gtmBasketItem" value=$basketitem->getArticle()}]
             [{assign var="gtmBasketItemCategory" value=$gtmBasketItem->getCategory()}]
             {
+            'item_oxid':        '[{$gtmCartArticles[$basketindex]->getFieldData('oxid')}]',
             'item_id':          '[{$gtmCartArticles[$basketindex]->getFieldData('oxartnum')}]',
             'item_name':        '[{$gtmCartArticles[$basketindex]->getFieldData('oxtitle')}]',
             'item_variant':     '[{$gtmCartArticles[$basketindex]->getFieldData('oxvarselect')}]',