Katana + Shopify Integration: The Setup Order That Works (and the Mistakes That Break It)

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The native Shopify integration is the single biggest reason we point D2C manufacturers at Katana: web orders land in your production system in real time, and your storefront's stock numbers stop being fiction. But we've also seen the integration set up wrong — inventory sync flipped on before stock was imported, SKUs that don't match, two systems both claiming to be the truth. The fix is doing the steps in the right order. Here's that order, based on how the integration actually behaves in 2026.

What syncs, and in which direction

Get the mental model right first, because each flow has its own rules. Sales orders flow one way, Shopify into Katana — it's always on while the integration is active. When you first connect, all existing unfulfilled Shopify orders import automatically; new orders sync in real time, and you choose during setup whether to import only paid orders or payment-pending ones too. Draft orders never sync, a hidden Shopify ID prevents duplicates, and you can optionally sync order changes — edited line items, cancellations, archiving — back into Katana. Returns raised in Shopify create return orders in Katana.

Inventory flows the other way, Katana into Shopify, and it has its own toggle that's off by default (this matters — more below). Once on, Katana pushes availability per variant as stock changes: in-stock minus committed becomes Shopify's "available," with kits and bundles adding potential buildable stock into the math, plus an overnight reconciliation pass. One change worth knowing since November 2025: Katana now subtracts all committed quantity — including wholesale and other non-Shopify orders — from what it pushes to Shopify, so your webstore can no longer oversell stock that's already promised to a distributor. Fulfillment status syncs both ways on its own toggle, and you can connect multiple Shopify stores to one Katana account, each with its own configuration.

The setup order (from a make-to-order manufacturer's playbook)

Do it in this sequence and the integration behaves; skip around and it bites. First, map locations — every Shopify location must be mapped to a Katana location before sync can even be activated (several Shopify locations can share one Katana location). Second, import products, which builds the SKU mapping table everything else relies on. Third, build your bills of materials, materials, and operations in Katana for those imported products — if BOMs are new territory, our BOM 101 guide walks through it. Fourth, optionally import customers. Fifth, import initial stock levels so Katana's numbers reflect what's actually on the shelves — this can only happen after products are imported and locations mapped. Sixth, activate sync. Seventh, spot-check a handful of orders and stock levels in both systems before you trust it with a weekend.

The mistakes we see

Three failure patterns cover most broken setups. SKU hygiene: the integration matches on SKUs, so duplicated, blank, or inconsistent SKUs between systems produce orphan line items — clean them before the product import, not after. Premature inventory sync: flipping the stock-push toggle on before importing initial stock tells Shopify you have zero of everything; do the stock import first, verify, then enable. Two sources of truth: once the integration is live, Katana owns inventory — production, receiving, and adjustments happen there, and Shopify just displays the result. Teams that keep hand-editing quantities in Shopify create the exact drift the integration exists to kill.

Where this fits in the bigger stack

The integration turns Shopify demand into Katana production automatically — orders pull make-orders, make-orders consume materials, purchasing sees what to reorder. If you're still deciding whether Katana is your MRP at all, start with our full Katana review and the Katana vs MRPeasy decision guide; if the storefront side is the open question, our Shopify for Manufacturers guide covers the margin math. Ready to wire it up? Start with Katana (free plan available) and Shopify here — both trials cost nothing, and the whole connection is an afternoon's work done in the order above.

And the numbers you feed Katana — batch sizes, machine speeds, yields — are only as good as the line they describe. Verifying those is what a Tecma site survey is for: contact us at sales@tecmausa.com or (786) 952-7575.

Full rankings: Best MRP & Inventory Software for Small Manufacturers · Recommended Software hub.