<script>  window.renderOptIn = function() {    window.gapi.load('surveyoptin', function() {      window.gapi.surveyoptin.render(        {          // REQUIRED FIELDS          "merchant_id": 733540687,          "order_id": "ORDER_ID",          "email": "CUSTOMER_EMAIL",          "delivery_country": "COUNTRY_CODE",          "estimated_delivery_date": "YYYY-MM-DD",          // OPTIONAL FIELDS          "products": [{"gtin":"GTIN1"}, {"gtin":"GTIN2"}]        });    });  } </script>