Adding a product to cart using a discount code in the checkout page

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Hi all, part of the functionality of the store we're building is the feature to add (free) specific products to the cart based on a discount code they enter at the checkout page. I can't seem to find a reliable way to do this, but maybe some of you can point me in the right direction or help me get started.

Appreciate any advice you all can offer, cheers!

Shopify Partner
2581 136 471

Ajax cart api; while it is a bit clunky having discount behavior logic in two places scripts only change a line items quantity or price.




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