Shopify fulfilment & 3pl integration after WooCommerce (2026)

WooCommerce stores using third-party logistics (3PL) providers connected via fulfillment plugins or custom webhooks. After migrating to Shopify, you need to either reconnect your existing 3PL via Shopify's fulfilment API or migrate to a new 3PL that has a first-party Shopify integration. Shopify's fulfilment architecture is more standardized than WooCommerce's — this works in your favor for most integrations.

Shopify's fulfilment architecture

• Fulfillment Service API: Third-party 3PLs register as a Fulfillment Service in Shopify. When an order is placed, Shopify sends fulfilment requests to the registered service. The service tracks inventory and sends tracking updates back.
• Location-based inventory: each fulfilment location (your warehouse, 3PL, retail location) is a separate Location in Shopify. Inventory is tracked per location.
• Order routing: Shopify routes orders to the correct location based on product inventory availability. Manual routing or automated rules.
• Fulfillment webhooks: Shopify sends orders/fulfilled and fulfillments/create webhooks — most 3PL integrations use these.

3PL provider selection for Shopify

3PL	Location	Shopify integration	Best for
ShipBob	UK, US, EU, AU, CA	Native Shopify app	Growing DTC brands, US-heavy distribution
Huboo	UK, EU	Native Shopify app	UK/EU ecommerce, fashion, health
Mintsoft (Byrd)	UK, EU	API integration	UK 3PLs using Mintsoft WMS
Torchbox	UK	API integration	UK SME ecommerce
Zendbox	UK	Native Shopify app	High-growth UK DTC
Amazon MCF	UK, US, EU	Amazon MCF Shopify app	Stores also selling on Amazon
Shopify Fulfillment Network (SFN)	US, Canada	Native (Shopify-run)	US-based stores with Shopify Shipping

ShipBob integration (most popular for Shopify)

• Install ShipBob app from Shopify App Store → connect your ShipBob account
• Product sync: ShipBob syncs your Shopify product catalog automatically. Each Shopify SKU maps to a ShipBob SKU.
• Inbound shipments: send stock to ShipBob warehouse via their inbound shipment process. ShipBob receives and puts away stock, updates Shopify inventory.
• Order routing: ShipBob automatically receives new Shopify orders, picks/packs/ships, and updates Shopify with tracking numbers.
• Multi-warehouse: ShipBob distributes inventory across US locations (e.g., Chicago, Los Angeles, New York) to minimize shipping zones/costs.
• Returns: ShipBob handles returns processing — returned items inspected, restocked or disposed.

Huboo integration (UK/EU focus)

• Install Huboo app from Shopify App Store
• Hub-based model: Huboo allocates each merchant their own "Hub" within the warehouse with a dedicated Hub Manager
• Inventory sync: Shopify inventory synced bidirectionally with Huboo WMS
• UK and EU fulfilment: Huboo has UK warehouse + EU warehouse (Netherlands) for DDP EU shipping
• Pricing: per-unit storage + per-order pick/pack/ship fee. No minimum volume for some tiers.

Custom 3PL integration via API

If your 3PL doesn't have a Shopify app, you can integrate via Shopify's Fulfillment Service API:

// 3PL webhook listener (receives orders from Shopify)
// When Shopify creates a fulfillment request, it calls this endpoint

app.post('/webhooks/shopify/fulfillment-create', async (req, res) => {
  const { order_id, line_items, destination, tracking_numbers } = req.body;

  // Parse line items: SKU and quantity to pick
  const pickList = line_items.map(item => ({
    sku: item.sku,
    quantity: item.quantity
  }));

  // Send pick request to 3PL WMS API
  await threePL.createShipment({
    reference: 'SHOPIFY-' + order_id,
    recipient: destination,
    items: pickList
  });

  res.status(200).json({ received: true });
});

// 3PL callback: when shipment dispatched, update Shopify fulfillment
async function markShopifyFulfilled(shopifyOrderId, trackingNumber, carrier) {
  await shopifyAdmin.post('/orders/' + shopifyOrderId + '/fulfillments.json', {
    fulfillment: {
      tracking_number: trackingNumber,
      tracking_company: carrier,
      notify_customer: true
    }
  });
}

Amazon Multi-Channel Fulfilment (MCF) for Shopify

If you use Amazon FBA, you can fulfil Shopify orders from your FBA stock:

• Install Amazon MCF app from Shopify App Store
• Shopify orders are routed to Amazon MCF which uses your FBA inventory to fulfil them
• Packaging: Amazon branded packaging. If your brand requires unbranded packaging, use a different 3PL for Shopify.
• Cost: MCF fees are separate from FBA fulfilment fees — typically higher per unit than standard FBA
• Inventory sync: MCF app syncs FBA inventory levels to Shopify (reduces Shopify stock when FBA stock allocated/shipped)

Migrating from WooCommerce 3PL integration

• WooCommerce + ShipBob: disconnect WooCommerce → reconnect Shopify via ShipBob app. Historical orders in ShipBob remain; only new Shopify orders flow through.
• Custom WooCommerce 3PL webhook: rebuild as Shopify Fulfillment Service registration + order webhook handler. Port the 3PL API calls.
• Stock on hand at 3PL during migration: coordinate with 3PL on cutover date. Physical stock doesn't move — only the software integration changes. Confirm stock counts match between Shopify and 3PL WMS before going live.
• In-flight orders during cutover: ensure WooCommerce orders that were placed but not yet shipped are fulfilled via WooCommerce fulfilment process or manually added to 3PL. Don't lose orders in the transition.

3PL migration checklist

• Confirm whether existing 3PL has a native Shopify app or requires API integration
• Install 3PL app on Shopify; connect to your 3PL account
• Sync product catalog: map all Shopify SKUs to 3PL SKUs — confirm 100% match before going live
• Set up Shopify location for 3PL warehouse: Admin → Settings → Locations → Add location
• Reconcile inventory: confirm physical stock at 3PL matches Shopify inventory on launch day
• Configure order routing: ensure new Shopify orders route to 3PL (not "self-fulfillment" location)
• Test end-to-end: place test order → confirm 3PL receives pick request → confirm Shopify receives tracking update
• Handle in-flight WooCommerce orders: list all WooCommerce orders pending fulfilment on cutover day and ensure they're processed via existing WooCommerce/3PL flow
• Configure returns process: 3PL returns update Shopify inventory levels automatically (confirm with 3PL)
• Set up inventory alerts: notify when any SKU at 3PL falls below reorder threshold

The most critical day in a 3PL-integrated migration is the cutover day itself. The physical stock hasn't moved — it's still in the 3PL warehouse — but the software integration point is changing from WooCommerce to Shopify. The two most common failure modes: (1) SKU mismatch — Shopify SKUs don't match 3PL SKUs, causing failed pick requests on day one; (2) inventory count discrepancy — Shopify shows different stock levels than the 3PL WMS due to orders that came in during the migration window. Solve both before the domain cutover: export a full SKU map and stock count from both systems and reconcile any discrepancies. The physical stock audit should be the final verification step before switching DNS.