Hello,
If you haven't sorted this already, you need to use Javascript to generate the date - won't work with PHP. I believe the date is used by Google to send the review to the cusomer so it needn't be too specific, in this example I've just added 7 days to the current date:
<script src="https://apis.google.com/js/platform.js?onload=renderOptIn" async defer></script>
<script>
window.renderOptIn = function() {
window.gapi.load('surveyoptin', function() {
const deliveryDate = new Date();
deliveryDate.setDate(deliveryDate.getDate() + 7);
function formatDate(date) {
var d = new Date(date),
month = '' + (d.getMonth() + 1),
day = '' + d.getDate(),
year = d.getFullYear();
if (month.length < 2)
month = '0' + month;
if (day.length < 2)
day = '0' + day;
return [year, month, day].join('-');
}
window.gapi.surveyoptin.render(
{
// REQUIRED FIELDS
"merchant_id": 12345678,
"order_id": "{orderId}",
"email": "{customerEmailAddress}",
"delivery_country": "GB",
"estimated_delivery_date": formatDate(deliveryDate)
// OPTIONAL FIELDS
//"products": [{"gtin":"GTIN1"}, {"gtin":"GTIN2"}]
});
});
}
</script>
Hope it helps
