n8n-nodes-faktoapp-wfirma

This is an n8n community node for wFirma — a popular Polish accounting and invoicing software. It connects to the wFirma API through the Fakto MCP server.

n8n is a fair-code licensed workflow automation platform.

Prerequisites

• An active wFirma account with API access (Access Key, Secret Key, App Key)
• A Fakto subscription API key
• n8n v1.0.0 or later

Installation

Follow the installation guide in the n8n community nodes documentation.

npm install n8n-nodes-faktoapp-wfirma

Credentials

Configure the wFirma API credential in n8n:

Resources & Operations

Invoice

• Get Many — List invoices with advanced filtering (date range, type, payment status, amounts)
• Get — Get single invoice by ID
• Get by Number — Find invoice by full number (e.g. "FV 19/2024")
• Get by Contractor NIP — List invoices by contractor tax ID
• Get by Contractor ID — List invoices by contractor ID
• Create — Create a new invoice with line items
• Create With XML — Create invoice using raw XML format
• Download PDF — Download invoice as PDF

Contractor

• Get Many — List contractors with filters (name, NIP, city)
• Create — Create a new contractor
• Create With XML — Create contractor with full XML data

Expense

• Get Many — List purchase documents with filters
• Get — Get single expense by ID

Payment

• Get Many — List payments with filters
• Get Details — Get payment details by payment ID
• Get Details by Object — Get payment details by document ID

Product

• Get Many — List products/services
• Get — Get single product by ID
• Create — Create a new product/service

Warehouse

• Get Warehouses — List warehouses
• Get Stock — Get current stock levels

Analytics

• Financial Summary — Revenue, expenses, and profit for a period
• Cash Flow — Cash flow analysis
• Calculate Profit — Profit calculation for a period
• Sales Analytics — Sales trends, top contractors and products
• Financial Analytics — Detailed financial analysis with margins
• Inventory Analytics — Warehouse turnover and stock level analysis

Prediction

• Cash Flow — Predict future cash flow
• Sales — Predict future sales
• Inventory Demand — Predict product demand
• Payments — Predict payment dates for unpaid invoices

Automation

• Payment Reminders — Send overdue payment reminders
• Auto-Number Invoices — Automatically number invoices
• Auto-Send Invoices — Automatically send invoices by email
• Low Stock Alerts — Generate low stock alerts
• Execute Rules — Execute configured automation rules

Tax (KPiR)

• Get Registers — Get KPiR (tax ledger) entries
• Get Register Summary — Get KPiR summary with totals
• Get ZUS Contributions — Get ZUS social security entries
• Get Sales Entries — Get sales entries from KPiR
• Get Purchase Entries — Get purchase entries from KPiR
• Compare Monthly — Compare financial results between months

AI Agent Integration

This node can be used as a tool for the AI Agent node in n8n. The AI Agent can automatically invoke wFirma operations (search invoices, manage contractors, generate financial reports, etc.) based on natural language instructions.

Option 1: Use as AI Agent Tool (recommended)

Simply add the wFirma node as a tool in your AI Agent configuration. The node has usableAsTool enabled, so it appears in the tool list automatically.

Option 2: Connect via MCP Client

Since this node communicates with an MCP server, you can also use the built-in MCP Client node to connect the AI Agent directly to the Fakto MCP server:

1. Add an MCP Client tool to your AI Agent node
2. Set the SSE URL to https://fakto.app/wfirma/stream
3. Add authentication headers with your wFirma credentials:

   {
     "x-wfirma-credentials": "{\"accessKey\":\"YOUR_ACCESS_KEY\",\"secretKey\":\"YOUR_SECRET_KEY\",\"appKey\":\"YOUR_APP_KEY\",\"subscriptionApiKey\":\"YOUR_KEY\"}"
   }
   

4. The AI Agent will automatically discover all 42 available tools from the MCP server

Compatibility

Tested with n8n v1.0.0 and later. Requires Node.js 22+.

License

MIT