what are the GTIN liquid variables?

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Hello,

Need to implement Google Reviews checkout script. I have found most of the variables for this. For example:  "order_id": "ORDER_ID" becomes  "order_id": "{{order.order_number}}"

 

But I cannot find the liquid variables for each GTIN of product(s) purchased. This:

 

"products": [{"gtin":"GTIN1"}, {"gtin":"GTIN2"}]

 

If anyone knows what to replace GTIN1 and GTIN2 with please let me know.

 

thank you!

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