Google customer reviews

Hello,
how to add Google Customer Reviews opt-in and survey?

On google sites, there is an example, I added it with my merchant id to NextMove HTML content on Thank You page, but only an empty field is showing

<!– BEGIN GCR Opt-in Module Code –><script src=”https://apis.google.com/js/platform.js?onload=renderOptIn&#8221;
async defer>
</script>

<script>
window.renderOptIn = function() {
window.gapi.load(‘surveyoptin’, function() {
window.gapi.surveyoptin.render(
{

“merchant_id”: XXXXXX,
“order_id”: “<?php echo $order_id ?>”,
“email”: “<?php echo $email_address ?>”,
“delivery_country”: “<?php echo $user_country ?>”,
“estimated_delivery_date”: “<?php echo $delivery_date ?>”,
“products”: [{“gtin”:”<?php echo $gtin_1 ?>”}, {“gtin”:”<?php echo $gtin_2 ?>”}],
“opt_in_style”: “BOTTOM_LEFT_DIALOG”
});
});
}

</script>

<!– END GCR Opt-in Module Code –>

<!– BEGIN GCR Language Code –>

<script>
window.___gcfg = {
lang: ‘en_US’
};
</script>

<!– END GCR Language Code –>