Pinterest: Include Product IDs to Add to Cart events

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I am getting this error message under Pinterest Tag health, "Product ID: Make sure you are including Product IDs in your Add to Cart events. A Product ID can be any format that you choose as long as it matches the format used by your Catalog."

Please guide me on how to add the Product ID in Add to cart events on my Shopify account, I am using the Minimal theme for Shopify.