Cart attribute
The hidden tag Harmonia writes into a Shopify cart (the ?ref= value) that ties a purchase back to the athlete who referred it, with no discount code needed.
The cart attribute is a hidden note that the brand's Shopify store records on the cart, holding the ?ref= value from the athlete's tracked link. The shopper never sees it and never types a code. When the order is placed, that value travels with the order so our server can match the sale to the right athlete. A small custom Shopify app writes the attribute and registers the orders/create webhook during install.
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