Using discount code to offer 2 products in the cart for free

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Hi all!

I'm running an affiliate program where I'm allowing affiliates to order up two 2 free garments. However, I haven't found a way to be able to give them a discount code at checkout to get either the 1 or 2 garment(s) free. I've downloaded and tried over 10 apps; however, nothing seems to be addressing my issue. Also, unfortunately, the discount code options that Shopify provides are very limited.

How are you guys approaching offering discount codes for a free product? 

Thank you all in advance!!!