Shopify is not your fulfilment system
Commerce front, warehouse back
Where Shopify stops
Shopify tells you what sold. It does not tell you whether the picker took the right batch, whether the label matched the tote, or whether the order should have been batched with the previous wave.
Integrate, do not pretend
Dark Store Systems connects sales channels to warehouse execution — store mapping, order ingest, and status back to the channel. Keep Shopify as the shop window; run the dark store on purpose-built fulfilment software.
Avoid duplicate stock truth
Pick one system of record for on-hand in the building. Sync outward to channels — do not let two masters argue during a same-day rush.