The most common worry mid-to-large enterprises raise when rolling out a WMS: "will it conflict with our ERP?" This guide breaks down the three mainstream integration patterns (ERP pulls / WMS pushes / two-way custom) and shows how GoWarehouse's public OpenAPI gives you flexibility no matter which ERP you run.
Why Integrate WMS and ERP at All?
Mid-to-large enterprises usually already run an ERP (SAP, Oracle, Digiwin, Yonyou, NetSuite) for accounting, HR, procurement, and finance. When rolling out a WMS, the most common worry is "will it conflict with our ERP?" The point of integration is to let each system do its job with consistent data — ERP runs the books, WMS runs the floor. Done well, it's 1 + 1 > 2.
Pattern 1: ERP Pulls (API Polling)
GoWarehouse exposes a complete public OpenAPI plus OAuth 2.0 credentials, so your ERP engineers can pull data on their own schedule: order line items, live inventory levels, shipping status, payables. Best fit: your ERP team has dedicated engineers and wants to own the integration timeline.
Pattern 2: WMS Pushes (Webhooks)
GoWarehouse can fire webhooks when events happen (order created, receiving complete, shipment dispatched), notifying your ERP in real time. Best fit: you need data to sync the instant it changes, you'd rather not have your ERP team build polling, or you need near-real-time reconciliation. Webhooks include retry-on-failure and signature verification to prevent loss.
Pattern 3: Hybrid / Custom
In practice most enterprises run a hybrid — webhook push for orders, scheduled ERP pull for end-of-month summary reports. GoWarehouse has integrated with SAP, Oracle, Digiwin Workflow, Yonyou, and NetSuite, and can adapt or customize to your existing architecture — no fixed rule about who pushes, who pulls, or who is the source of truth.
The 5 Most Common Integration Points
(1) Item master: ERP → WMS sync of basic SKU data. (2) Purchase orders: ERP → WMS receiving notification. (3) Sales orders: WMS → ERP shipping confirmation and invoicing. (4) Inventory reconciliation: scheduled two-way comparison. (5) Payables / receivables: WMS supplies PO payables and order amounts; ERP consolidates them into the financial reports.
Timeline and Cost
A standard integration (items + orders + inventory) typically takes 2–4 weeks. Adding finance reconciliation and a multi-entity structure pushes it to 1–2 months. Very complex cases (multi-entity, multi-currency, custom fields) can run 2–3 months. One-time cost ranges NT$ 30,000–300,000 depending on complexity — usually scoped jointly by a GoWarehouse consultant and your IT team.
Frequently Asked Questions
QWe run SAP (or Digiwin) — can we integrate?
AYes. GoWarehouse has shipped integrations with every major ERP. The exact approach depends on your version and how much it's been customized — the consultant will scope the best fit with your IT team.
QDoes GoWarehouse need to come on-site?
AUsually not. Integration is typically done over video calls, API docs, and a shared test environment. Heavy customization or go-live can include an on-site week or two.
QOur ERP isn't on the latest version — can we still integrate?
AUsually yes. GoWarehouse's API supports multiple ERP versions. Very old ERPs (10+ years) may need an intermediate translation layer, which adds cost.
QWill ERP and WMS double-write and conflict during integration?
ANo, because they operate at different layers (ERP runs the books, WMS runs the floor). The integration design always names a clear source of truth — item master usually owned by the ERP, live warehouse state by the WMS.
QIf we switch ERPs later, do we redo the WMS integration?
AYes, but the second pass is usually 30–50% cheaper (API docs are familiar, logic is settled). When you do switch ERPs, it's a good moment to review and improve the original integration design.