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Show Your Shopify Customers Their Discount Code in Your Store

Shopify allows us to add a discount to a URL.  That discount code gets stored in a cookie and then gets read by the checkout to pre-populate the discount code.  You can see how that whole process works here - https://help.shopify.com/manual/promoting-marketing/discount-codes/managing-discount-codes#promote-a-discount-using-a-shareable-link.