Mid-market and enterprise WooCommerce stores connected to an ERP (NetSuite, SAP, Odoo, Sage, QuickBooks) need to rebuild that integration after migrating to Shopify. The integration architecture changes because Shopify's API is different from WooCommerce's, but the underlying patterns — inventory sync, order routing, customer sync — remain the same. Here's how to approach the ERP integration after migration.

Common WooCommerce ERP integration patterns

Before migration, document how your WooCommerce ERP integration worked:

Direction: Which system is the source of truth for each data type?
- Product/pricing: ERP → WooCommerce (ERP pushes prices and product data)
- Inventory levels: ERP → WooCommerce (warehouse stock synced to store)
- Orders: WooCommerce → ERP (orders pushed to ERP for fulfillment)
- Customers: Bidirectional (sync customer records between systems)
Sync frequency: Real-time webhook, scheduled every 15 minutes, daily batch
Middleware: Was there a middleware layer (Celigo, Boomi, MuleSoft, custom Python/Node service)?
ERP connector plugin: WooCommerce had a connector plugin (e.g., WooCommerce NetSuite Integration by Folio3)?

Shopify ERP integration options by ERP

NetSuite

Celigo Shopify-NetSuite Integrator: Most popular pre-built integration. Handles bidirectional order, inventory, customer, and product sync. Template-based, configurable. $750–$2000+/month.
Folio3 Shopify-NetSuite Integration: Custom integration specialist. Bidirectional sync with mappings for NetSuite custom fields to Shopify metafields.
NetSuite SuiteCommerce Connect: NetSuite's own Shopify connector. Native NetSuite module.
API direct: Build using NetSuite's SuiteScript 2.x and Shopify's Admin API. Most flexible, most expensive to maintain.

SAP (S/4HANA or SAP Business One)

Boomi: Integration platform (iPaaS) with SAP and Shopify connectors. Drag-and-drop flow builder.
MuleSoft: Enterprise integration platform for SAP/Shopify. Salesforce-owned.
SAP Business One + Shopify: Connectors from B1 Usability Package, Sana Commerce, or custom via SAP's DI API

Odoo

Odoo Shopify Connector: Available in Odoo App Store. Handles product, order, and inventory sync. Open source.
Direct API: Odoo has a JSON-RPC API. Shopify has a REST/GraphQL API. Custom integration via any backend language.

Sage (X3, 200, 50)

Patchworks: UK-based integration platform with Sage and Shopify connectors. Popular with UK merchants.
Tradebox: E-commerce to Sage accounting integration specialist.
Veeqo: Inventory management platform with Sage and Shopify sync (acquired by Amazon).

QuickBooks (Online or Desktop)

QuickBooks Commerce: QuickBooks' own inventory + order management for Shopify.
Sync with QuickBooks by Webgility: Popular, pre-built Shopify to QuickBooks accounting sync.
Zapier: For simpler QuickBooks integrations (new order → create invoice in QB).
Bold Commerce: Shopify + QuickBooks integration with order-to-invoice mapping.

Integration architecture: source of truth mapping

Before building the integration, define the source of truth for each data type:

Data type	Typical source of truth	Sync direction
Products (master data)	ERP or PIM	ERP → Shopify
Pricing	ERP	ERP → Shopify
Inventory levels	ERP / Warehouse	ERP → Shopify (real-time or scheduled)
Orders	Shopify (origin)	Shopify → ERP
Order fulfillment status	ERP / WMS	ERP → Shopify
Customers	Depends — often ERP for B2B, Shopify for B2C	Bidirectional
Invoice/accounting	ERP	Shopify orders → ERP invoices
Returns/refunds	Shopify (initiated)	Shopify → ERP

Key Shopify API endpoints for ERP integration

Inventory sync

// Get inventory levels for a location
GET /admin/api/2024-01/inventory_levels.json?location_ids=LOCATION_ID

// Set inventory level
POST /admin/api/2024-01/inventory_levels/set.json
{
  "location_id": 1234,
  "inventory_item_id": 5678,
  "available": 50
}

Order sync

// Get new orders since last sync
GET /admin/api/2024-01/orders.json?status=any&updated_at_min=2024-01-01T00:00:00Z

// Update order fulfillment status
POST /admin/api/2024-01/orders/{order_id}/fulfillments.json
{
  "fulfillment": {
    "tracking_number": "1Z999AA10123456784",
    "tracking_company": "UPS"
  }
}

Product/pricing sync

// Update variant price
PUT /admin/api/2024-01/variants/{variant_id}.json
{
  "variant": {
    "price": "29.99",
    "compare_at_price": "39.99"
  }
}

Shopify webhooks for real-time ERP sync

Use webhooks for real-time event processing rather than polling:

orders/create: New order → push to ERP for fulfillment
orders/paid: Payment confirmed → trigger ERP invoice creation
orders/fulfilled: ERP fulfilled order → Shopify confirmed
refunds/create: Refund initiated → ERP credit memo
products/update: Product changed in Shopify → notify ERP if Shopify is source of truth for content

Migration transition: dual-running ERP connections

During the migration window when both WooCommerce and Shopify may be processing orders:

Maintain WooCommerce → ERP integration until WooCommerce is retired
Build and test Shopify → ERP integration in staging/parallel
Set a cutover date: on that date, disable WooCommerce integration, enable Shopify integration
Manually handle any orders that bridge the cutover (last WooCommerce orders + first Shopify orders)

ERP integration migration checklist

Document current WooCommerce ERP integration: sync direction, frequency, middleware, field mappings
Select Shopify ERP integration method (pre-built connector, iPaaS, custom)
Map WooCommerce API fields to Shopify Admin API equivalents for each data type
Set up test environment: sandbox Shopify + ERP dev instance
Configure bidirectional sync with source of truth defined per data type
Set up webhooks for real-time order → ERP routing
Test order flow end-to-end: Shopify order → ERP creation → fulfillment → Shopify status update
Test inventory sync: ERP inventory adjustment → Shopify level update
Plan cutover: disable WooCommerce integration, enable Shopify integration, reconcile orders in gap
Monitor first 2 weeks: verify order counts match between Shopify and ERP

ERP integration is often the most critical technical dependency in mid-market WooCommerce migrations — get it wrong and orders get lost, inventory goes out of sync, and fulfillment breaks down. It's worth dedicating a parallel workstream to ERP integration alongside the standard product migration. Use k-sync for the product/catalog migration and build the ERP integration separately with the appropriate time allocation.

Connecting your erp to Shopify after migrating from WooCommerce (2026)