When a shopper buys a multipack or bundle, many 3PLs pick and bill every single unit. Set pack levels per product (each, inner, case, pallet) and map your selling SKUs and Shopify bundles to them. New fulfillment orders get pick instructions in cases and inner packs where possible, with exceptions flagged before export. Send them to your 3PL as CSV, JSON or signed webhook, then check the 3PL invoice against them. Read-only: nothing in your store is changed. For brands that ship through a 3PL.

• Set each, inner, case and pallet levels with the SKUs your 3PL uses
• Map multipacks, variety boxes and Shopify bundles to the units your 3PL picks
• Get pick instructions for new fulfillment orders, with exceptions flagged
• Export pick lists to your 3PL as CSV or JSON, or send them by signed webhook
• Check your 3PL invoice against the pick lists to spot extra pick fees