Rebate joins: Referral crusades made simple. Make and track joins, either with a Shopify rebate or a savvy bargain appended. Prefill the truck with items.
Discount rules : Give a Shopify rebate or a Smart Deal dependent on the truck ($ sum, qty) and who's purchasing (client tag, past requests). Join rules.
Upsells, BOGO and Gifts: Suggest bargains like BOGO and Free Gifts inside a choice of things. Upsell and Cross-sell clients in truck with a custom offer.