n8n Webhook Order Processing: Supplier, Shipping, CRM & ERP APIs

Automate paid order fulfillment end-to-end with an n8n webhook workflow

This n8n Webhook Order Processing workflow receives paid-order webhooks from your online store, verifies the request signature, checks supplier stock, and then routes each order through supplier purchasing, shipping label creation, customer email, CRM updates, and ERP inventory updates—automatically.

What this workflow does

• Receives and secures the webhook: Captures the raw body for HMAC signature verification to ensure requests are legitimate.
• Normalizes and de-duplicates orders: Normalizes the order (including SKU mapping) and de-duplicates repeat deliveries by order ID so duplicates are acknowledged without reprocessing.
• Checks supplier availability: Calls the supplier stock API and branches based on in-stock vs out-of-stock status.
• If in stock: Creates a supplier purchase order, generates a shipping label with tracking, emails the customer, upserts customer/order in the CRM, and updates inventory in the ERP.
• If out of stock: Tags the customer/order as BACKORDER in the CRM, emails the customer with supplier lead time, and posts an operations alert.
• Returns the fulfillment result: Responds to the webhook with fulfillment route (fulfilled or backorder) plus tracking/lead-time details; duplicates are acknowledged without reprocessing.
• Runs a scheduled low-stock digest: Every six hours, reads ERP inventory, compiles a low-stock digest (≤5 units), and posts it to an operations alert channel.

Use cases

• Turn paid-order webhooks into automatic supplier + shipping + CRM + ERP updates.
• Prevent double-processing when your store retries webhook deliveries using order ID de-duplication.
• Handle backorders cleanly by tagging BACKORDER, notifying customers, and alerting operations.
• Maintain proactive inventory visibility with a scheduled low-stock digest.

Technical details

• Core n8n nodes: webhook, if, set, code, and http request (plus sticky note for guidance).
• External APIs: Supplier stock + purchasing, shipping label + tracking, customer email, CRM upserts, and ERP inventory reads/updates.
• Setup: Configure API base URL and replace placeholder endpoints (supplier, shipping, CRM, ERP, messaging, alerts) with your real services or native n8n integrations.