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NameDescription and usage
productProduct code – Includes a refCode property, with the value of the product reference code string. The refCode must exactly match the refCode (guid) specified in the product catalog feed. Also, if you have a custom feed, contact your Optimizely Customer Success manager to find out which field from the feed is used as a product identifier.

Product page tracking request example.

If you want the returned recommendations to contain only product codes for recommended products, use the recContent parameter and specify refCodeOnly (see [Product Recommendations response](🔗)).