Hi,
 
	I am trying to integrate the opt-in Survey for google customer reviews (https://support.google.com/merchants/answer/7106244?hl=en-gb&ref_topic=7105160), but having a bit of an issue trying to work out the Variables: 
	 
 
	"merchant_id": "MERCHANT_ID",
 
	"order_id": "ORDER_ID",
 
	"email": "CUSTOMER_EMAIL",
 
	"delivery_country": "COUNTRY_CODE",
 
	"estimated_delivery_date": "YYYY-MM-DD",
 
	// OPTIONAL
 
	"products":[{"gtin":"GTIN1"}, {"gtin":"GTIN2">}],
 
	"opt_in_style": "OPT_IN_STYLE"
 
	 
 
	The example given is:  
	 
 
	"merchant_id": 42,
 
	"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"
 
	 Could anyone offer any assistance?
 
	 
	Regards, 
	Alan