Every 3PL claims to integrate with Shopify. The differences show up in the details: how orders sync, how tracking writes back, how inventory locations behave and what happens with partial and split shipments. Here is what to test before you commit.
- Real-time order streaming beats scheduled syncs
- Tracking must write back automatically with the right status
- Inventory should sync as a Shopify location, not an app guess
- Test split shipments and pre-orders before signing
What a deep Shopify integration looks like
Orders should reach the warehouse within seconds of checkout, not on a fifteen-minute poll, because minutes matter against a same-day cutoff. Fulfillment status and tracking numbers should write back automatically so Shopify sends the shipping notification without anyone touching it.
Inventory should sync as a genuine Shopify location with available-to-sell quantities updating on every movement, and the integration should respect Shopify's fulfillment order model so partial shipments and cancellations behave correctly.
- Sub-minute order streaming
- Automatic tracking and status write-back
- Location-level inventory sync
- Correct handling of partial and split fulfillment
The edge cases that cause real pain
Standard orders work everywhere. What breaks integrations is everything else: pre-orders, backorders, subscriptions, bundles built in an app, gift messages, address edits after placement, and cancellations mid-pick.
Ask specifically how each is handled and then test them in a sandbox. Discovering that bundles arrive as unmapped line items after you have migrated inventory is an expensive way to learn.
Beyond the integration
Integration quality is table stakes; the operation still decides your outcomes. Ask for published order accuracy, on-time dispatch against cutoff, receiving turnaround and inventory variance, plus references from brands at your volume.
Location matters as much as software. Model your order distribution against the warehouse position to see what percentage of customers fall inside one, two and three ground days.
Migration without downtime
Plan two to four weeks. Connect and test the integration first, move a subset of SKUs, run both operations briefly in parallel, then cut over channel by channel rather than all at once.
Keep enough inventory at the old provider to cover the overlap, and agree removal terms in writing before you start so the final pallets do not become a negotiation.