Upcart—Cart Drawer Cart Upsell

Jacinda from UpCart saved the day! I had spent days trying figure out how to combine Buy X, Get Y (Gift with Purchase / Reward Spend Thresholds) with subscriptions and also allow product-level discounts to apply to the subscriptions too. The solution was complex but the gist is to not use Buy X, Get Y in Shopify, but rather make a 100% off product discount with a minimum QTY of 1, make that product hidden from your store, then use UpCart to add the product to your cart. Works perfectly in all scenarios!