How to install the Google Customer Reviews code PS 8+

[ComGrafPL]

Any have any working solution to implement Google Customer Reviews cod in order-confirmation.tpl.

https://support.google.com/merchants/answer/14629205

Tried with

          "order_id": "{/literal}{$smarty.get.id_order}{literal}",
          "email": "{/literal}{$customer.email}{literal}",
          "delivery_country": "PL",
          "estimated_delivery_date": "{/literal}{$smarty.now + (60*60*24*1)|date_format:"%Y-%m-%d"}{literal}"

and

          "order_id": "$id_order",
          "email": "$customer->email",
          "delivery_country": "$cart->id_address_delivery",
          "estimated_delivery_date": "$delivery",

Nothing seems to work.