# Connect Claude or ChatGPT via MCP to wFirma invoicing and KSeF

> Quick overview Connect Claude, ChatGPT or any MCP client to wFirma, the Polish invoicing and accounting service. Nine tools cover about 40 API modules: search and edit invoices, contractors, payments and expenses, read the official API docs live and save PDFs to Google Drive, with a guard for irreversible KSeF actions. How it works 1. An MCP Server Trigger with n8n User Auth (OAuth2) exposes 9 tools. Users sign in with their n8n account, and only people allowed to run the workflow can connect. 2. Every tool calls a gateway inside the same workflow ($workflow.id), so you import one file. The Plan node builds the wFirma API URL and checks whether the call needs approval; Route sends it to the API, the approval guard or the docs branch. 3. For API calls, the XML node converts the request into wFirma's XML format, the HTTP Request node sends it, and the answer is parsed back into clean JSON with ok, status, records and pagination. 4. If wFirma rate-limits a read (find/get), the workflow wa

- **Domain**: `n8n-workflow-21577.n8n.io`
- **Provider**: n8n.io (https://n8n.io)
- **Kind**: workflow
- **Live-responds (last probe)**: None
- **Signed card**: False
- **Streaming**: False
- **Quality score**: 40%

## URLs
- Agent card: https://n8n.io/workflows/21577
- Page (HTML): https://agenstry.com/agents/n8n-workflow-21577.n8n.io
- Documentation: https://n8n.io/workflows/21577