How to sync shopify inventory across channels on Starch
Selling across Shopify, Amazon, and wholesale channels at the same time means your inventory number lives in multiple places — and those places disagree the moment a unit moves. A sale on Shopify doesn't automatically decrement your Amazon listing. A wholesale order doesn't pull from the same pool your DTC store thinks it owns. The result is oversells, canceled orders, and the kind of customer experience that takes months to recover from.
What this looks like in practice varies: a brand doing most volume on Shopify with a growing Amazon presence has a different problem than one managing a co-packer, a 3PL, and three wholesale portals simultaneously. The core failure mode is the same, though — no single place that reflects real available inventory across every channel in real time.
On Starch, you end up with a single inventory view that reflects what's actually available to sell, updated as orders come in across channels. When a unit sells on any channel, every other channel sees it. When stock at a location drops below a reorder threshold, you get a flag before you're already out. Three apps are currently in development to handle this directly — Marketplace Sync, Inventory Planner, and Amazon Channel Manager (all coming soon; you can request beta access now). In the meantime, you can connect Shopify and Amazon from Starch's integration catalog and describe the inventory dashboard or sync logic you need — Starch builds it from that description.
Why it matters
Overselling one SKU on two channels costs you more than just that order — you cancel, you lose marketplace standing, and you erode the trust of the buyer or retailer you just disappointed. Carrying excess inventory because you can't see real velocity across channels ties up cash and invites spoilage or write-offs. Getting this right means every channel sells from the same pool, reorders trigger before you're stocked out, and your team stops reconciling spreadsheets every Monday morning.
Common pitfalls
The most common mistakes: treating each sales channel as its own inventory silo and reconciling manually at the end of the day (by which point you've already oversold), using a single safety stock number across channels that have completely different velocity patterns, conflating on-hand quantity with available-to-sell quantity when some units are reserved for pending wholesale orders, and updating channel listings manually after a bulk shipment arrives instead of automating the increment — which means the update happens late, or not at all.
Starch apps used
See this running on Starch
Connect your tools, describe what you want, and the agent builds it. Closed beta is free.
Choose your operator
A version of this guide tailored to your role — same recipe, different starting context.
Related workflows in Ops & Supply
Inventory shrinkage is the gap between what your records say you have and what's actually on the shelf, in the warehouse, or at your co-packer.
Read guide →Closing out the POS at end of night means verifying that what the register says happened actually matches what the cash drawer holds, what the card processor settled, and what the day's receipts show.
Read guide →Contractor job costing is the practice of tracking what a job actually costs — labor, materials, subcontractors, equipment — against what you estimated, and updating that number as work progresses and change orders land.
Read guide →Retailer deductions and distributor chargebacks are line items that show up on your remittance as money already taken — a short-pay for a late delivery, a promotional allowance you never agreed to, a compliance fee for a label that met spec.
Read guide →