This is ridiculous. Such a basic functionality
Shopify option 1 is to be able to add a scpecific free gist in the cart from Checkout page throught a promo code.
Shopify option 2 is to be able to add attach coupon code to an order to allow us to find orders with the coupon code and send the free gift with it.
It is a basic functionality that people asked for over the last 2 year, I can't believe it still hasn't been implemented yet.
Please help me to find a workaround at least as we have a 6 digit marketing campain using BOGO that is currently running and absolutely not working.