Create KSeF invoices from completed Sellf purchases via KSeF Gateway
Ready for 3.0Ready for 3.0. This template uses no nodes that n8n 3.0 removes. No removed nodes, versions or helpers found. Static check, last run 2026-10-19.
What this workflow does
This workflow has 14 nodes and runs when an HTTP POST request hits its webhook URL. It uses only n8n's built-in nodes.
How it runs
Trigger: When an HTTP POST request hits its webhook URL.
- Configuration (EDIT ME) (Edit Fields (Set)): sets 8 fields: ksefGatewayUrl, sellerNip, sellerName…
- Verify Signature (Code): runs custom JavaScript code
- Signature Valid? (If): checks a condition and branches into true / false
- Respond OK (Respond to Webhook): sends the response back to the webhook caller
- Respond Unauthorized (Respond to Webhook): sends the response back to the webhook caller
- Is Purchase? (Switch): routes items into 1 branches
- Extract Purchase Data (Code): runs custom JavaScript code
- Needs Invoice? (Switch): routes items into 1 branches
- Build KSeF Payload (Code): runs custom JavaScript code
- Send to KSeF Gateway (HTTP Request): calls an HTTP API (POST)
…plus 3 more steps. See the full node list below.
Before you upgrade to n8n 3.0
Nothing in this workflow is removed in n8n 3.0, so it should import and run after the upgrade.
Nodes used (7)
- Webhook
n8n-nodes-base.webhook - Edit Fields (Set)
n8n-nodes-base.set - Code
n8n-nodes-base.code - If
n8n-nodes-base.if - Respond to Webhook
n8n-nodes-base.respondToWebhook - Switch
n8n-nodes-base.switch - HTTP Request
n8n-nodes-base.httpRequest
From the author
Quick overview This workflow receives signed Sellf purchase webhooks, validates the HMAC signature, and when the buyer requests an invoice with a NIP it builds a KSeF-ready invoice and submits it to a self-hosted KSeF Gateway, capturing the returned KSeF…